Preparation and Properties of Silane-Terminated Poly(urethane-Imide)

2013 ◽  
Vol 690-693 ◽  
pp. 1577-1580
Author(s):  
Xiao Xi Hu ◽  
Yun Wang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Silane Coupling ◽  
Ft Ir ◽  
And Storage ◽  
Thermal Stability Of

A serious of silane-terminated poly (urethane-imide) (Si-PUI) was synthesized via prepolymer method using polycarbonatediols (PCDL), 2,4-tolylene diisocyanate (TDI), 4,4'-Oxydiphthalic Anhydride (ODPA) and silane coupling agent KH-550. The structure of the products was characterized by FT-IR. The thermal properties were measured by thermal gravimetric analysis (TGA). The thermal mechanical behavior was investigated by dynamic mechanical analysis (DMA).The mechanical characteristic was measured by tensile tests. The water absorption (Wa) was also been tested. With the imide content increasing, the thermal stability, tensile strength and storage modulus of poly (urethane-imide) improve significantly, and the glass transition temperature rises. The introduction of silanes improves the water resistance and further enhances the thermal stability of poly (urethane-imide).

scholarly journals The Thermal Properties of Polyurethane/Neoprene Blends on Prosthetic Foot

2020 ◽  
Vol 990 ◽  
pp. 106-110
Author(s):  
Mohd Zulkifli Mohamad Noor ◽  
Mohamad Anas Mohd Azmi ◽  
Mohd Shaiful Zaidi Mad Desa ◽  
Mohd Bijarimi Mat Piah ◽  
Azizan Ramli
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Low Cost ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Prosthetic Foot ◽  
Reinforced Polymer ◽  
New Material ◽  
Thermal Stability Of

Neoprene reinforced polymer has become an attraction in current research and development of new material blend. In this invention, neoprene was chosen to be enhance to polyurethane because of their superior properties that possess extraordinary mechanical, electrical, optical and thermal properties on prosthetic foot. In this research, polyurethane was chosen due to good rigidity, easy processing and low cost. The reinforcement polyurethane with neoprene is expected to improve the properties of polyurethane. The objective of this research was conducted to investigate the effect of neoprene contents on thermal properties of polyurethane reinforced neoprene on prosthetic foot. The effect of neoprene on thermal properties neoprene reinforced polyurethane was analysed in term of its thermal stability by thermal gravimetric analysis (TGA). Moreover, the visual of small topographic details on the surface of polyurethane/neoprene blends will be examined by scanning electron microscope (SEM). Based on result, the thermal properties show the great enhancement at high neoprene contents which is 1.0wt%. The thermal stability of polyurethane reinforced neoprene improves when the temperature where decomposition starts to occurs are higher than decomposition temperature of pure polyurethane. Then, thermal conductivity of polyurethane shows the great improvement after the addition of neoprene. Lastly, the smooth surface and visible of sheets pattern on surface represent the present of neoprene disperse into polymer that enhance brittleness. Thus, the presence of neoprene has clearly enhanced the thermal stability of the polyurethane. Table 1 shows formulation of neoprene and polyurethane.

Study on the thermal stability of Controlled Permeability Formwork

2011 ◽  
Vol 374-377 ◽  
pp. 1426-1429
Author(s):  
Xiao Meng Guo ◽  
Jian Qiang Li ◽  
Xian Sen Zeng ◽  
De Dao Hong
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Dynamic Mechanical Analysis ◽  
Thermo Gravimetric Analysis ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Construction Work ◽  
Thermo Gravimetric ◽  
Excellent Thermal Stability ◽  
Thermal Stability Of

In this study, the thermal properties of a kind of new geotextile materials, so called controlled permeable formwork (CPF), were studied. Thermo-gravimetric analysis showed that the weight of CPF didn’t change much between 0~350 °C. Dynamic mechanical analysis showed that the storage modulus of CPF reduced from 25 MPa to around 10 MPa when the temperature rose to above 100 °C. The strength of sample decreased slightly with the increase of the temperature. The breaking elongation changed slightly with a maximum at 80 °C. The CPF showed excellent thermal stability and was suitable for general use in construction work.

Thermal Gravimetric Analysis of Unsaturated Polyesters Filled with Alumina Trihydrate and Silica Aerogel

2017 ◽  
Vol 264 ◽  
pp. 116-119 ◽  
Author(s):  
Zulhelmi Alif Abdul Halim ◽  
Muhamad Azizi Mat Yajid ◽  
Mohd Hasbullah Idris ◽  
Halimaton Hamdan
Keyword(s):  
Thermal Stability ◽  
Thermal Gravimetric Analysis ◽  
Silica Aerogel ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Polyester Matrix ◽  
Alumina Trihydrate ◽  
Thermal Stability Of

Thermal degradation of the composite blend consisting unsaturated polyester resin, alumina trihydrate and silica aerogel was studied using thermal gravimetric analysis. Composite filled with silica aerogel show lower density and slightly improve the thermal stability of the pure polymer. The addition of alumina trihydrate slows down the degradation of the polymer due to the release of bond water while the combination of silica aerogel and alumina trihydrate in polyester matrix does not interrupt the function of alumina trihydrate due to inert properties of silica aerogel.

Effects of Imidization Temperature on the Structure and Properties of Electrospun Polyimide Nanofibers

2014 ◽  
Vol 9 (4) ◽  
pp. 155892501400900 ◽  
Author(s):  
Xuejia Li ◽  
Xin Wang ◽  
Qingqing Wang ◽  
Qufu Wei
Keyword(s):  
Thermal Stability ◽  
Chemical Structure ◽  
Testing Machine ◽  
Gravimetric Analysis ◽  
Elongation At Break ◽  
Universal Testing ◽  
Thermal Imidization ◽  
Ft Ir ◽  
Nanofiber Membranes ◽  
Thermal Stability Of

A two-step process for preparing polyimide nanofiber was used in this work, and the nanofibers of precursor polyamic acid (PAA) were prepared by electrospinning. The polyimide nanofibers were obtained through thermal imidization at different thermal imidization temperatures. The influences of different imidization temperatures on morphology, chemical structure, thermal stability, and mechanical properties of the polyimide nanofibers were investigated by Fourier Transform Infrared Spectroscope (FT-IR), Scanning Electronic Microscopy (SEM), thermal gravimetric analysis (TGA) and Electromechanical Universal Testing Machine. The experimental results show that the imidization of PAA nanofibers was not complete under 290°C but complete under 350°C. With the rise of imidization temperature from 290 °C to 350°C, the polyimide nanofibers became thinner, and the thermal stability of polyimide nanofibers was also improved. The breaking strength and elongation at break of the nanofiber membranes increased at higher imidization temperature.

scholarly journals An Investigation on the Comprehensive Property Assessment and Future Directions of Single Bamboo Fiber Reinforced Polypropylene Composites Fabricated by a Non-Woven Paving and Advanced Molding Process

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2641 ◽  
Author(s):  
Tang ◽  
Wang ◽  
Wang ◽  
Cheng ◽  
Guo
Keyword(s):  
Thermal Stability ◽  
Impact Strength ◽  
Water Resistance ◽  
Decomposition Temperature ◽  
Modulus Of Rupture ◽  
Gravimetric Analysis ◽  
Molding Process ◽  
Scanning Calorimetry ◽  
Bamboo Fibers ◽  
Thermal Stability Of

The demand for eco-friendly renewable natural fibers has grown in recent years. In this study, a series of polypropylene-based composites reinforced with single bamboo fibers (SBFs), prepared by non-woven paving and a hot-pressing process, were investigated. The influence of the content of SBF on impact strength, flexural strength, and water resistance was analyzed. The properties of the composites were greatly affected by the SBF content. Impact strength increased as SBF content increased. The modulus of rupture and modulus of elasticity show an optimum value, with SBF contents of 40% and 50%, respectively. The surface morphology of the fractured surfaces of the composites was characterized by scanning electron microscopy. The composites showed poor interfacial compatibility. The water resistance indicates that the composites with higher SBF contents have higher values of water absorption and thickness swelling, due to the hydrophilicity of the bamboo fibers. The thermal properties of the composites were characterized by thermal gravimetric analysis and by differential scanning calorimetry. The thermal stability of the composites was gradually reduced, due to the poor thermal stability of SBFs. In the composites, the maximum decomposition temperature corresponding to SBF shows an increasing trend. However, the maximum decomposition temperature of polypropylene was not influenced by SBF content. The melting point of the polypropylene in the composites was lower relative to pure polypropylene, although it was not affected by increasing SBF content.

Effect of chemical treatment on thermal properties of bagasse fiber-reinforced epoxy composite

2017 ◽  
Vol 24 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Varun Mittal ◽  
Shishir Sinha
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Chemical Treatment ◽  
Epoxy Composite ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Chemical Treatments ◽  
Bagasse Fiber ◽  
Thermal Stability Of

AbstractThe present paper deals with a study of the thermal properties of bagasse fiber (BF)-reinforced epoxy composites. BFs are subjected to untreated and chemical treatments with 1% sodium hydroxide followed by 1% acrylic acid at ambient temperature before the composites are made. The thermal stability of the components was studied by thermogravimetric analysis and differential scanning calorimetry, as well as by differential thermal gravimetric analysis. Thermal analysis results of untreated BF-reinforced epoxy composite were compared with treated BF-reinforced epoxy composite. The chemical treatment of BF induces reasonable changes in the thermal stability of the polymer composites.

The Preparation of CMC-PVA-AM Dust Suppression Agent and its Application Appraisement

2015 ◽  
Vol 1120-1121 ◽  
pp. 628-634 ◽  
Author(s):  
Yu Chen Xiao ◽  
Chi Zheng ◽  
Meng Ke Gan ◽  
Shui Li Lai
Keyword(s):  
Water Resistance ◽  
Coal Dust ◽  
Synthetic Polymer ◽  
Poly Vinyl Alcohol ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Good Thermal Stability ◽  
Shape Characteristic ◽  
Ft Ir ◽  
Ir Analysis

In this article, a kind of synthetic polymer dust suppressants agent was prepared with poly (vinyl- alcohol) (PVA), carboxymethylcellulose (CMC) and acrylamide (AM). The chemical and physical properties of this dust suppressant was characterized by means of grafting rate, FT-IR analysis, TG test, viscosity analysis and SEM survey. The result showed that grafting rate was reached 95.6%; IR spectrum proved that monomers have been completely reacted basically; thermal gravimetric analysis was characterized that the dust suppressant has good thermal stability between 0°C-250°C; the amount of AM and SDBS were 50% and 1.0% (based on mass of the total materials), the polymer has a suitable viscosity; SEM was used to observe the shape characteristic of the coal dust which formed a link between the dust suppressant and coal dust. The water resistance of the dust suppressant was well in 24h.

Synthesis and Fluorescence Properties of a New Eu(III) Complexes with β-Diketone Ligand

2014 ◽  
Vol 1003 ◽  
pp. 11-14
Author(s):  
Ya Nan Lu ◽  
Xiong Yan Zhao ◽  
Xin Wang
Keyword(s):  
Thermal Stability ◽  
Fourier Transform ◽  
Rare Earth ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Strong Emission ◽  
Light Emitting ◽  
Organic Light ◽  
Strong Emission Band ◽  
Ft Ir

A novel β-diketone 4-[4-(Dibenzylamino) phenyl]-2,4-dioxobutanoic (DPD) and its corresponding Eu3+ complex with 1,10-phenanthroline were synthesized. The structure, thermal behaviour and fluorescence property of the complex was characterized by Fourier Transform Infrared (FT-IR), thermal gravimetric analysis (TGA) and fluorescence spectrophotometer. The fluorescence characterization shown that the addition of β-diketone and 1,10-phenanthroline enhance the fluorescence intensity of the complex. Eu3+ complex was considered to be a valuable organic light-emitting material with bright red fluorescence because of its strong emission band. Furthermore, the thermal stability characterizarion shows that the obtained rare earth β-diketone complexes have good thermostability.

Thermal and Morphological Properties of Chitosan Filled Epoxy

2014 ◽  
Vol 627 ◽  
pp. 12-17
Author(s):  
Britto Satheesh ◽  
Kim Yeow Tshai ◽  
Nick Warrior
Keyword(s):  
Thermal Stability ◽  
Diglycidyl Ether ◽  
Morphological Properties ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Weight Percentage ◽  
Force Microscopy ◽  
Atomic Force ◽  
Thermal Stability Of

This paper investigates the effects of polysaccharide additive agent on the morphological and thermal properties of thermosetting polymer. The weight percentage (wt%) of Diglycidyl Ether of Bisphenol A (DGEBA) epoxy resin to Hexamethylenediamine (HMDA) hardener were kept constant while a varyingwt% of chitosan, ranging from 0 to 10wt% was introduced. The chitosan filled epoxy hardener mixture was allowed to cure at 40°C for a period of 12 hours. Dynamic Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) were conducted on the specimens to analyse the effects of chitosan loading on thermal stability and transition temperature while Atomic Force Microscopy (AFM) was used to investigate the changes to its morphological property. At chitosan loading of 2.5wt% and below, good dispersion of the additive was observed. Apparent agglomeration and phase separation were formed when chitosan content increases above 7.5wt%. The formation of bulky chitosan agglomeration was found capable of enhancing the thermal stability of the thermoset polymer. The diamine acted as the co-reactants with DGEBA as well as spacer which decrease the effect of material brittleness due to addition of chitosan.

The use of bisfuroic acid derivatives in the curing of bismaleimides

1994 ◽  
Vol 6 (3) ◽  
pp. 249-256 ◽  
Author(s):  
D G Hawthorne ◽  
J H Hodgkin ◽  
M B Jackson ◽  
T C Morton
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Behaviour ◽  
Thermal Gravimetric Analysis ◽  
Diels Alder ◽  
Gravimetric Analysis ◽  
Resin System ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

The use of 2,2-bis(4-[(2-carboxy-5-furyl)oxy]phenyl)propane as a Diels-Alder based co-reactant for curing bismaleimides was investigated. Differential scanning calorimetry and thermal gravimetric analysis were used to study the thermal behaviour of this reactant on its own and in the presence of 1,1'-(4methylene-4,1-phenylene)bismaleimide. The range of products formed under different cure conditions was determined by vFnR spectroscopy. The DMTA characteristics and thermal stability of cured laminates made from this resin system have been investigated. It is concluded that the thermal stability and other properties of laminates made from this system are only comparable to those of a typical commercial bismaleimide system.

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