scholarly journals Moisture Adsorption and Desorption Behavior of Raw Materials for the T-RTM Process

2021 ◽  
Vol 5 (1) ◽  
pp. 12
Author(s):  
Janek Herzog ◽  
Rainer Wendel ◽  
Peter Weidler ◽  
Michael Wilhelm ◽  
Philipp Rosenberg ◽  
...  
Keyword(s):  
Raw Materials ◽  
Polyamide 6 ◽  
Water Vapor Sorption ◽  
Sorption Behavior ◽  
Thermoplastic Resin ◽  
Adsorption And Desorption ◽  
Reinforced Plastics ◽  
Rtm Process ◽  
The Matrix ◽  
Moisture Sensitive

The use of fiber reinforced plastics (FRPs) has significant potential to reduce the weight of components. As regards the sustainability of these components, thermoplastic matrices offer more potential for recycling than thermoset ones. A possible manufacturing process for the production of thermoplastic FRPs is thermoplastic resin transfer molding (T-RTM). In this very moisture-sensitive process, ε-caprolactam in addition to an activator and catalyst polymerizes anionically to polyamide 6 (aPA6). The anionic polymerization of aPA6 is slowed down or even completely blocked by the presence of water. This study analyses the sorption behavior of the matrix, fiber, binder and core materials for the production of anionic polyamide 6 composites, which are processed in the thermoplastic RTM process. Water vapor sorption measurements are used to determine the adsorption and desorption behavior of the materials. The maximum moisture loading of the materials provides information about the water adsorption capacity of the material. This knowledge is crucial for correct handling of the materials to achieve a fast process and good properties of the final product.

scholarly journals Separation and Purification of Two Flavone Glucuronides fromErigeron multiradiatus(Lindl.) Benth with Macroporous Resins

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-feng Zhang ◽  
Yuan Liu ◽  
Pei Luo ◽  
Hao Zhang
Keyword(s):  
Large Scale ◽  
Raw Materials ◽  
Sorption Isotherms ◽  
Preparative Separation ◽  
Separation And Purification ◽  
Bioactive Constituents ◽  
Simple Method ◽  
Scale Separation ◽  
Adsorption And Desorption ◽  
Macroporous Resins

Scutellarein-7-O-β-D-glucuronide (SG) and apigenin-7-O-β-D-glucuronide (AG) are two major bioactive constituents with known pharmacological effects inErigeron multiradiatus. In this study, a simple method for preparative separation of the two flavone glucuronides was established with macroporous resins. The performance and adsorption characteristics of eight macroporous resins including AB-8, HPD100, HPD450, HPD600, D100, D101, D141, and D160 have been evaluated. The results confirmed that D141 resin offered the best adsorption and desorption capacities and the highest desorption ratio for the two glucuronides among the tested resins. Sorption isotherms were constructed for D141 resin under optimal ethanol conditions and fitted well to the Freundlich and Langmuir models (R2>0.95). Dynamic adsorption and desorption tests was performed on column packed with D141 resin. After one-run treatment with D141 resin, the two-constituent content in the final product was increased from 2.14% and 1.34 % in the crude extract ofErigeron multiradiatusto 24.63% and 18.42% in the final products with the recoveries of 82.5% and 85.4%, respectively. The preparative separation of SG and AG can be easily and effectively achieved via adsorption and desorption on D141 resin, and the method developed can be referenced for large-scale separation and purification of flavone glucuronides from herbal raw materials.

Friction and wear characteristics of fibre-reinforced plastic composites

2018 ◽  
Vol 33 (6) ◽  
pp. 828-850 ◽  
Author(s):  
R Vinayagamoorthy
Keyword(s):  
Friction And Wear ◽  
Wear Behaviour ◽  
Tribological Behaviour ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
The Matrix ◽  
Comprehensive Survey ◽  
Working Parameters ◽  
Sliding Distance ◽  
Friction And Wear Characteristics

The dominance of fibre-reinforced plastics in industries has enhanced the need for research to develop new composites and assess their properties. Among the various property analyses, tribological characteristics of the composites help to understand the friction and wear behaviour. This article presents a comprehensive survey on the tribological behaviour of polymeric composites, which includes the influence of various working parameters such as the velocity of sliding, sliding distance, pressure applied and temperature on the friction and wear. The article also addresses about the importance of the composite constituents such as fibre composition, fibre geometry and fibre orientation on the tribological behaviour. The major reasons causing the tribological failure like the debonding between the fibre and the matrix, failure of the matrix and the fibre are also extensively addressed. This review would be an insight to the industries and tribology researchers towards achieving optimum design for the components made of polymers.

scholarly journals The Socioeconomic Bases of Biofuels Production Business at the Organizational Level

2021 ◽  
Vol 5 (520) ◽  
pp. 175-187
Author(s):  
R. V. Lohosha ◽  
◽  
I. A. Semchuk ◽  
Keyword(s):  
Business Processes ◽  
Raw Materials ◽  
Biofuel Production ◽  
Organizational Level ◽  
Technological Support ◽  
Agricultural Enterprises ◽  
Efficient Management ◽  
The Matrix ◽  
Scientific Substantiation ◽  
The One

The article is aimed at defining the priorities for the development of the biofuel market in Ukraine to ensure the energy security of the country and satisfy the country’s energy needs. Prospects for the bioenergy sector of the economy in the world will be determined primarily by the optimization of national policies in the matrix of multifarious criteria. The place of the Ukrainian model is highly likely to be determined, on the one hand, by the development of the national market, on the other hand, by the production of raw materials for world biofuel markets. At the same time, this market and production in Ukraine remains only a potentially promising model that requires a scientific substantiation for its efficiency. As a result of the study, it is specified that the bioenergy industry has serious limitations and problems of economic nature that require scientific substantiation. After analyzing the limitations and prospects of the industry development in Ukraine at the level of agricultural enterprises that could deploy biofuel production, it should be emphasized that: 1) there is currently no biofuel market in Ukraine: there is no significant production, hence the proposal still remains unformed; there are no agents (firms, enterprises) of the market that would form the established demand; the necessary norms, institutions, mechanisms of the representative market have not been developed; 2) there is no successful experience of such a business both in Ukraine in general and in agricultural enterprises in particular. From here, as well as taking into account the above-mentioned aspects, the attractiveness of this business, including investment, needs to be justified. Enterprises of this group will face funding problems, as well as technical and technological support problems. Therefore, special careful economic substantiation of the market efficiency model and business processes is required; 3) because of these reasons, the task of scientific substantiation of the model of efficient management of this business becomes highly topical.

Study on the Technical Conditions of Old Newspaper(ONP)/ Recycled-Polypropylene(rPP) Composites

2012 ◽  
Vol 262 ◽  
pp. 418-421 ◽  
Author(s):  
Xiao Lin Zhang ◽  
Xiang Feng Bo
Keyword(s):  
Raw Materials ◽  
Flexural Modulus ◽  
Waste Recycling ◽  
Practical Significance ◽  
Molding Pressure ◽  
Elongation At Break ◽  
Plastic Composites ◽  
Recycled Polypropylene ◽  
The Matrix ◽  
Recycled Plastics

Use of resource-rich wastepaper/recycled plastics as raw materials in the production of wood-plastic composites(WPC) can alleviate the shortage of wood resources, reduce pollution and has a attractive prospect. In this paper, old newspaper fiber(ONPF)/recycled-polypropylene(rPP) Wood-Plastics Composite(WPC) was prepared by means of mixing processing and compression molding. The effects of technical conditions on the mechanical properties of WPC were investigated. The structure of composite was characterized by means of FTIR and SEM. The results show that, Wastepaper and waste-PP can be used as raw materials for preparation of WPC. The suitable preparation process for wastepaper/rPP composites was: wastepaper fiber 20%, blending temperature 175°C, blending time 15min, molding pressure 12MPa, molding temperature 175°C and molding time 10min. In these conditions, tensile strength and flexural strength of wastepaper/rPP composites are 23.6MPa and 28.8MPa respectively, increased by 20.9% and 12.6% compared to those of rPP matrix. The elongation at break of WPC is 10.6%, and the flexural modulus is 1328.9MPa，increased by 7.7% compared to those of rPP matrix. The structure analysis found that there is no chemical reaction between the fibers and the matrix. The research results have important practical significance in the field of printing and packaging waste recycling and utilization, environmental protection and energy saving.

Thermal and Tensile Properties of PP Nanocomposite Blends

2008 ◽  
Vol 47-50 ◽  
pp. 21-24
Author(s):  
C. Rosales ◽  
V. Contreras ◽  
M. Matos ◽  
R. Perera ◽  
N. Villarreal ◽  
...  
Keyword(s):  
Tensile Modulus ◽  
Polyamide 6 ◽  
Dispersed Phase ◽  
Scanning Calorimetry ◽  
Binary Blend ◽  
Polyethylene Blends ◽  
Metallocene Polyethylene ◽  
The Matrix ◽  
Twin Screw ◽  
Layered Clay

Polypropylene/polyamide-6 and polypropylene/metallocene polyethylene blends containing 2.5 phr of organophilic modified montmorillonite were prepared in a twin-screw extruder followed by injection molding. In order to compare, blends without layered clay were also made. Styreneethylene- butylene-styrene copolymer and polypropylene grafted with anhydride maleic were used as compatibilizers in the ternary blends and in the PP nanocomposite preparation, respectively. The presence of tactoids, intercalated and exfoliated structures was observed by TEM in some of the samples containing layered clay and modified PP materials. Results showed that the compatibilized blends prepared without clay are tougher than those prepared with the nanocomposite of PP as the matrix phase and no significant changes in tensile moduli were observed between them. However, the binary blend with a nanocomposite of PP as matrix and metallocene polyethylene exhibited better tensile toughness and lower tensile modulus, than those prepared with a nanocomposite of PP and polyamide-6 as dispersed phase. These results are related to the degree of clay dispersion in the PP and to the type of morphology developed in the different blends. Differential scanning calorimetry (DSC) showed that blends with a finer and homogeneously dispersed morphology determined by SEM, the PA component exhibited fractionated crystallization exotherms in the temperature range of 159-185°C. Also, nucleation of the PP component by PA phase and/or the layered clay was observed in the blends with PA as dispersed phase.

Development of shape memory alloy hybrid yarns for adaptive fiber-reinforced plastics

2018 ◽  
Vol 89 (8) ◽  
pp. 1371-1380 ◽  
Author(s):  
Moniruddoza Ashir ◽  
Andreas Nocke ◽  
Chokri Cherif
Keyword(s):  
Shape Memory ◽  
Technological Development ◽  
Fiber Reinforced ◽  
Material Loss ◽  
Reinforced Plastics ◽  
The Core ◽  
Hybrid Yarn ◽  
Pull Out ◽  
The Matrix ◽  
Fiber Reinforced Plastics

The application of shape memory alloys (SMAs) for the development of adaptive fiber-reinforced plastics has been expanding steadily in recent years. In order to prevent matrix damage and optimize the actuating potential of SMAs during the process of thermally induced activation, a barrier layer between SMAs and the matrix of fiber-reinforced plastics is required. This article approaches the textile technological development of SMA hybrid yarns as a core–sheath structure using friction spinning technology, whereby the SMA serves as the core. Four types of hybrid yarns are produced by varying the number of process stages from one to three, as well as the core and sheath materials. The decoupling of the SMA from fiber-reinforced plastics is crucial for optimizing the actuating potential of SMA, thus it is tested by means of the pull-out test. Although the material loss coefficient increases by raising the number of process stages, the three-stage processing of SMA hybrid yarn with an additional glass roving is found to be the most suitable variation for decoupling SMA from the matrix of fiber-reinforced plastics.

Investigation of the fatigue behavior of thermoplastic composites by load increase tests

2020 ◽  
pp. 002199832095452
Author(s):  
Andreas Baumann ◽  
Sebastian Backe ◽  
Joachim Hausmann
Keyword(s):  
Fatigue Behavior ◽  
Numerical Data ◽  
Fatigue Loading ◽  
Polyamide 6 ◽  
Heat Emission ◽  
Thermoplastic Composites ◽  
Failure Behavior ◽  
Glass Fiber Reinforced ◽  
The Matrix ◽  
Load Increase

Fatigue is one major load case in many structures for transport applications. New materials often lack the necessary data base for a fast application in cyclic loaded components due to time consuming testing series. The aim of this study is the evaluation of the load increase test as method to determine a possible fatigue limit of glass fiber reinforced polyamide 6. Under the working hypothesis that cracks are the main contributors for heat emission, the results show that the investigated material exhibits a different behavior in comparison to thermosets. Instead of crack formation experimental and numerical data indicate that the matrix relaxes under fatigue loading. This relaxation could potentially lead to crack prevention but might also result in the observed sudden failure behavior of the material. These findings suggest a totally different behavior of thermoplastic composites under fatigue loading.

Moisture Sorption Isotherms and Isosteric Heats of Sorption of High-Pressure Treated Paulownia Wood under Different Storage Conditions

2019 ◽  
Vol 62 (1) ◽  
pp. 105-114
Author(s):  
Xiuping Jiang ◽  
Xiuping Jiang ◽  
Huanhuan Li ◽  
Hosahalli S. Ramaswamy ◽  
Songming Zhu ◽  
...  
Keyword(s):  
High Pressure ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Storage Conditions ◽  
Sorption Behavior ◽  
Adsorption And Desorption ◽  
Moisture Sorption Isotherm ◽  
Moisture Sorption Isotherms ◽  
Paulownia Wood

Abstract. Understanding of moisture sorption isotherms (MSI) is critical for predicting the stability of wood during handling, transport, and storage. The aim of this study was to evaluate the adsorption and desorption isotherm characteristics of high-pressure (HP) treated paulownia wood and to identify the best-fitting model to describe its sorption behavior. The equilibrium moisture contents (EMCs) of HP-treated paulownia wood were obtained using a static gravimetric method under different storage conditions: three temperatures (20°C, 30°C, and 40°C) and five water activity (aw) levels (0.32 to 0.95). Results showed that HP parameters did not significantly affect the MSI trend of treated groups. Eight modified models (modified Chung-Pfost, modified Henderson, modified Oswin, modified Halsey, Chen-Clayton, Guggenheim-Anderson-de Boer (GAB), simply modified GAB, and Peleg) were fitted to the experimental data. The Chen-Clayton model (temperature-dependent) produced randomized residuals and the best prediction performance for both adsorption and desorption among all models. Net isosteric heat of adsorption and desorption decreased from 7.55 to 4.84 kJ mol-1 and from 18.1 to 12.2 kJ mol-1, respectively, with an increase in EMC from 7.5% to 10%. The isosteric temperature (Tß) was 352 K for adsorption and 335 K for desorption, between which all the adsorption and desorption reactions proceeded at the same rate. All thermodynamic functions were adequately characterized by a power law model. Keywords: Equilibrium moisture content, High-pressure treatment, Modeling, Moisture sorption isotherm, Paulownia wood, Temperature, Thermodynamic analysis.

scholarly journals Comparison of Mechanical Properties of Hemp-Fibre Biocomposites Fabricated with Biobased and Regular Epoxy Resins

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5720 ◽  
Author(s):  
Vicente Colomer-Romero ◽  
Dante Rogiest ◽  
Juan Antonio García-Manrique ◽  
Jose Enrique Crespo
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
Raw Materials ◽  
Green Composites ◽  
Bending Tests ◽  
Three Point Bending ◽  
Reinforced Plastics ◽  
Structural Applications ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Plastics

Bio- and green composites are mainly used in non-structural automotive elements like interior panels and vehicle underpanels. Currently, the use of biocomposites as a worthy alternative to glass fibre-reinforced plastics (GFRPs) in structural applications still needs to be fully evaluated. In the current study, the development of a suited biocomposites started with a thorough review of the available raw materials, including both reinforcement fibres and matrix materials. Based on its specific properties, hemp appeared to be a very suitable fibre. A similar analysis was conducted for the commercially available biobased matrix materials. Greenpoxy 55 (with a biocontent of 55%) and Super Sap 100 (with a biocontent of 37%) were selected and compared with a standard epoxy resin. Tensile and three-point bending tests were conducted to characterise the hemp-based biocomposite.

scholarly journals Structural Investigations of Solidification and Heat Treatments Influence on High Alloyed Cast Irons Grades with Nb-V-Ti Additions

2009 ◽  
Vol 289-292 ◽  
pp. 77-86 ◽  
Author(s):  
Jacqueline Lecomte-Beckers ◽  
Jérôme Tchoufang Tchuindjang
Keyword(s):  
Phase Transformations ◽  
Volume Fraction ◽  
Raw Materials ◽  
Solidification Process ◽  
Heat Treatments ◽  
Hot Strip Mill ◽  
Cast Irons ◽  
Structural Investigations ◽  
Alloyed Cast ◽  
The Matrix

Two High Alloyed Cast Irons (HACI) were studied, both belonging to the Fe-C-Cr-Si-X system where X represented a strong carbide forming element. One of these alloys was obtained after adding Nb, V and Ti to the chemical composition of the other alloy. Raw materials originated from spun cast rolls for hot strip mill were submitted to different heat treatments routes, in order to study the influence of alloying elements on the microstructure. Both HACI grades contained a mixture of martensite and retained austenite matrix in the as-cast conditions and after quenching. Differential Thermal Analysis was carried out on the heat treated samples in order to determine the phase transformations occurring during re-melting and subsequent solidification sequence. Diffusionless transformations leading to various types of martensite were found in the matrix. Bulky NbC carbides precipitating at the beginning of the solidification process strongly influence the nature and the rate of the subsequent diffusional phase transformations, particularly for HACI grade with Nb, V and Ti additions. Quantitative metallography was done to determine graphite, NbC carbides, cementite and matrix volume fraction in HACI studied grades.

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