scholarly journals Processing and Characterisation of Banana Leaf Fibre Reinforced Thermoplastic Cassava Starch Composites

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1420
Author(s):  
Ridhwan Jumaidin ◽  
Nuraliah Ahmad Diah ◽  
R. A. Ilyas ◽  
Roziela Hanim Alamjuri ◽  
Fahmi Asyadi Md Yusof
Keyword(s):  
Mechanical Properties ◽  
Decomposition Temperature ◽  
Cassava Starch ◽  
Thermal And Mechanical Properties ◽  
Good Adhesion ◽  
Intermolecular Hydrogen Bonds ◽  
Morphological Studies ◽  
Ft Ir ◽  
Banana Leaf ◽  
Thermal Stability Of

Increasing environmental concerns have led to greater attention to the development of biodegradable materials. The aim of this paper is to investigate the effect of banana leaf fibre (BLF) on the thermal and mechanical properties of thermoplastic cassava starch (TPCS). The biocomposites were prepared by incorporating 10 to 50 wt.% BLF into the TPCS matrix. The samples were characterised for their thermal and mechanical properties. The results showed that there were significant increments in the tensile and flexural properties of the materials, with the highest strength and modulus values obtained at 40 wt.% BLF content. Thermogravimetric analysis showed that the addition of BLF had increased the thermal stability of the material, indicated by higher-onset decomposition temperature and ash content. Morphological studies through scanning electron microscopy (SEM) exhibited a homogenous distribution of fibres and matrix with good adhesion, which is crucial in improving the mechanical properties of biocomposites. This was also attributed to the strong interaction of intermolecular hydrogen bonds between TPCS and fibre, proven by the FT-IR test that observed the presence of O–H bonding in the biocomposite.

Thermal and Mechanical Properties of Mulch Film from Poly(Lactic Acid)/Expoxidized Natural Rubber Blends Filled with Rutile TiO2 as Fillers

2013 ◽  
Vol 844 ◽  
pp. 65-68
Author(s):  
Pranee Nuinu ◽  
Kittikorn Samosorn ◽  
Kittisak Srilatong ◽  
Siripa Tongbut ◽  
Sayant Saengsuwan
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Thermal Stability ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Natural Rubber ◽  
Decomposition Temperature ◽  
Poly Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Thermal Stability Of

The aim of this research was to reduce and improve the brittleness and thermal properties of poly lactic acid (PLA), respectively. Epoxidized natural rubber (ENR) was used to enhance the toughness and rutile titanium dioxide (R-TiO2) as filler was also incorporated to improve the thermal properties of the PLA. 10wt% ENR with epoxidation contents of 25 mol% (ENR25) and 50 mol% (ENR50) and various R-TiO2contents (0-10 phr)were compounded with PLA by using a twin-screw extruder at 155-165°C and a rotor speed of 40 rpm. The pellets of blends were then formed a thin film using a cast film extruder machine and cooled down under air flow. Thermal and mechanical properties and morphology of PLA/ENR/R-TiO2thin film were investigated. The crystallinity of PLA was found to increase with addition of ENR. The mechanical properties of thin film showed that the ENR50 enhanced the elongation but reduced the tensile strength of PLA with addition of R-TiO2at 5 and 10 phr, respectively. The TGA indicated that the addition of 10 phr R-TiO2increased in the decomposition temperature at 5% weight loss (Td5%) of PLA/ENR film. Thus the thermal stability of PLA/ENR50 was found to improve with addition of R-TiO2. From morphology study, the ENR50 phase showed a good dispersion in the PLA matrix. In conclusion, the addition of ENR and R-TiO2was found to enhance both toughness and thermal stability of PLA.

scholarly journals Effect of Organic Modifier Types on the Physical–Mechanical Properties and Overall Migration of Post-Consumer Polypropylene/Clay Nanocomposites for Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1502
Author(s):  
Eliezer Velásquez ◽  
Sebastián Espinoza ◽  
Ximena Valenzuela ◽  
Luan Garrido ◽  
María José Galotto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Clay Nanocomposites ◽  
Organic Modifier ◽  
Thermal And Mechanical Properties ◽  
Chemical Safety ◽  
Elongation At Break ◽  
Fatty Food ◽  
Recycled Plastics ◽  
Thermal Stability Of

The deterioration of the physical–mechanical properties and loss of the chemical safety of plastics after consumption are topics of concern for food packaging applications. Incorporating nanoclays is an alternative to improve the performance of recycled plastics. However, properties and overall migration from polymer/clay nanocomposites to food require to be evaluated case-by-case. This work aimed to investigate the effect of organic modifier types of clays on the structural, thermal and mechanical properties and the overall migration of nanocomposites based on 50/50 virgin and recycled post-consumer polypropylene blend (VPP/RPP) and organoclays for food packaging applications. The clay with the most hydrophobic organic modifier caused higher thermal stability of the nanocomposites and greater intercalation of polypropylene between clay mineral layers but increased the overall migration to a fatty food simulant. This migration value was higher from the 50/50 VPP/RPP film than from VPP. Nonetheless, clays reduced the migration and even more when the clay had greater hydrophilicity because of lower interactions between the nanocomposite and the fatty simulant. Conversely, nanocomposites and VPP/RPP control films exhibited low migration values in the acid and non-acid food simulants. Regarding tensile parameters, elongation at break values of PP film significantly increased with RPP addition, but the incorporation of organoclays reduced its ductility to values closer to the VPP.

Structure and properties of a phenylethynyl-terminated PMDA-type asymmetric polyimide

2018 ◽  
Vol 31 (3) ◽  
pp. 261-272 ◽  
Author(s):  
Yixiang Zhang ◽  
Masahiko Miyauchi ◽  
Steven Nutt
Keyword(s):  
Mechanical Properties ◽  
Thermal Processing ◽  
Amorphous Structure ◽  
Decomposition Temperature ◽  
Thermal And Mechanical Properties ◽  
Chain Mobility ◽  
Amorphous Structures ◽  
The Cross ◽  
Imide Oligomers ◽  
The Relationship

A new polymerized monomeric reactant (PMR)-type polyimide, designated TriA X, was investigated to determine polymer structure, processability, thermal, and mechanical properties and establish the relationship between the molecular structure and those properties. TriA X is a PMR-type polyimide with an asymmetric, irregular, and nonplanar backbone. Both the imide oligomers and the cross-linked polyimides of TriA X exhibited loose-packed amorphous structures, independent of thermal processing. The peculiar structures were attributed to the asymmetric backbone, which effectively prevented the formation of closed-packed chain stacking typically observed in polyimides. The imide oligomers exhibited a lower melt viscosity than a control imide oligomer (symmetric and semi-crystalline), indicating a higher chain mobility above the glass transition temperature ( Tg). The cured polyimide exhibited a Tg = 362°C and a decomposition temperature = 550°C. The cross-linked TriA X exhibited exceptional toughness and ductility (e.g. 15.1% at 23°C) for a polyimide, which was attributed to the high-molecular-weight oligomer and loose-packed amorphous structure. The thermal and mechanical properties of TriA X surpass those of PMR-15 and AFR-PE-4.

Study on the preparation and properties of polyamide/chitosan nanocomposite fabricated by electrospinning method

2021 ◽  
Author(s):  
Mahyar Fazeli ◽  
Faegheh Fazeli ◽  
Tamrin Nuge ◽  
Omid Abdoli ◽  
Shokooh Moghaddam
Keyword(s):  
Structural Characteristics ◽  
Decomposition Temperature ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
Sem Images ◽  
Electrospinning Method ◽  
Maximum Current ◽  
The Matrix ◽  
Ft Ir ◽  
Amine Groups

Abstract The principal intention of this work is to fabricate and characterize the polyamide/chitosan nanocomposite by a novel single solvent method through the electrospinning procedure. The thermal properties and morphology of prepared nanocomposite are studied by thermogravimetric analysis (TGA) and field-emission scanning electron microscopy (FE-SEM). TGA exposed that the primary decomposition temperature is reduced with rising of chitosan content in the nanocomposites and origin disintegration temperature for polyamide/chitosan nanocomposites is perceived to be in the range from 300 to 500°C. Also, FE-SEM images demonstrated that the nanofibers of chitosan have good adhesion on the matrix and are well-oriented. Besides, the crystallinity and structural characteristics of the polyamide/chitosan nanocomposites are investigated by using X-ray diffraction (XRD) and Fourier transform-infrared spectroscopy (FT-IR), respectively. The results of XRD proved that the successful blending of chitosan in polyamide is achieved via the electrospinning method. FT-IR results demonstrate that the nanofibers are consist of amine groups. Also, the electrical properties of the nanocomposite improved with the increasing content of chitosan and the conductivity of the polyamide/chitosan 5 wt% demonstrates the maximum current of 0.3 nA. Besides, the sheet resistance of the composite reduced 118 to 20 × 109 Ω with raising the chitosan volume from 0 to 5 wt%.

scholarly journals Research on the Microstructure and Property of an Anion Rubber Modified Asphalt

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Wei Hong ◽  
Qingshan Li ◽  
Guoquan Guan ◽  
Youbo Di ◽  
Jing Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Development Process ◽  
Asphalt Pavement ◽  
Social Benefits ◽  
Modified Asphalt ◽  
The Road ◽  
Surrounding Environment ◽  
Rubber Particles ◽  
Ft Ir ◽  
Thermal Stability Of

The anion rubber modified asphalt (ARMA) mixture was first successfully developed with a unique process. In the development process, rubber and asphalt were mixed in the same proportion. Furthermore, the microstructure and modification mechanism of the material were characterized by SEM, FT-IR, TG, and XRD tests. The mechanical property of the mixture was also tested in accordance with the relevant standards. In the end, the material’s capacity of releasing anion was measured by DLY-6A232 atmospheric ion gauge. The results indicated that the addition of anion additive into the rubber modified asphalt (RMA) was a mere physical mixture, and the anion additives and rubber particles uniformly dispersed in the ARMA. The addition of anion additive could improve the thermal stability of the RMA. Compared with the traditional asphalt pavement material, the ARMA material shows excellent mechanical properties as well as the ability of releasing anion. Moreover, the material has enormous economic and social benefits by taking full advantage of a large amount of waste tires, thus improving the road surrounding environment.

Thermal and mechanical properties of polymethyl mathacrylate reinforced by polyhedral oligomeric silsesquioxane

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Benghong Yang ◽  
Meng Li ◽  
Bangping Song ◽  
Yun Wu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Thermal And Mechanical Properties ◽  
Sem Images ◽  
Pmma Matrix ◽  
Oligomeric Silsesquioxane ◽  
Tga And Dsc ◽  
Thermal Stability Of

AbstractA series of Inorganic/organic nanocomposites were prepared by blending cage-like carboxyl-bearing polyhedral oligomeric silsesquioxane (carboxyl-POSS) with polymethyl mathacrylate (PMMA) in THF solvent. FTIR and 29Si-NMR were employed to characterize the structures of the nanocomposites. SEM images showed that the as-prepared films were smooth and no aggregation of carboxyl-POSS was observed. TGA and DSC results showed that the incorporation of small amount of nanosize carboxyl-POSS enhanced the thermal stability of PMMA. When 1.0 wt% of carboxyl-POSS was incorporated into PMMA matrix, the Tg and Td increased by 16.9 °C and 21.0 °C, respectively. However, higher POSS contents (>1.0 wt%) would deteriorate the thermal and mechanical properties of the nanocomposites.

Study on structure and properties of biodegradable PLA/PBAT/organic-modified MMT nanocomposites

2019 ◽  
pp. 089270571989090 ◽  
Author(s):  
Hezhi He ◽  
Bida Liu ◽  
Bin Xue ◽  
He Zhang
Keyword(s):  
Mechanical Properties ◽  
Poly Lactic Acid ◽  
Esterification Reaction ◽  
Melt Blending ◽  
Structure And Properties ◽  
Thermal And Mechanical Properties ◽  
Modified Montmorillonite ◽  
Structure Morphology ◽  
Reinforcing Effects ◽  
Thermal Stability Of

Biodegradable polymer blends were prepared by melt blending poly(lactic acid) (PLA), poly(butylene adipate- co-terephthalate) (PBAT), and organic-modified montmorillonite (MMT). The effects of MMT on the structure, morphology, thermal, and mechanical properties of the blends were thoroughly investigated. The results revealed that MMT was preferable to localize on the interface of PLA and PBAT and esterification reaction took place between organic-modified MMT and PLA/PBAT. MMT enhanced the compatibility of PLA and PBAT, accelerated crystallization, and improved the thermal stability of PLA and PBAT. In addition, MMT illustrated the reinforcing effects on PLA and PBAT in their tensile strength, especially for PBAT.

scholarly journals Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1510 ◽  
Author(s):  
Denis Mihaela Panaitescu ◽  
Sorin Vizireanu ◽  
Sergiu Alexandru Stoian ◽  
Cristian-Andi Nicolae ◽  
Augusta Raluca Gabor ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Thermal And Mechanical Properties ◽  
Tempo Oxidation ◽  
Water Suspensions ◽  
Shaped Tube ◽  
Surface Modified ◽  
Mediated Oxidation ◽  
Thermal Stability Of ◽  
Modified Cellulose

Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of the composites (PHB-MCC-P and PHB-MCC-T) differently. However, both treatments were efficient in improving the fiber–polymer interface and the mechanical properties, with an increase of the storage modulus of composites by 184% for PHB-MCC-P and 167% for PHB-MCC-T at room temperature. The highest increase of the mechanical properties was observed in the composite containing plasma modified cellulose although TEMPO oxidation induced a much stronger surface modification of cellulose. This was due to the adverse effect of more advanced degradation in this last case. The results showed that Y-shaped plasma jet oxidation of cellulose water suspensions is a simple and cheap treatment and a promising method of cellulose functionalization for PHB and other biopolymer reinforcements.

Effect of gamma radiation on physico-mechanical properties of vulcanized natural rubber/carbon fiber composites

2016 ◽  
Vol 48 (8) ◽  
pp. 677-690 ◽  
Author(s):  
Medhat M Hassan ◽  
Khaled F El-Nemr ◽  
Anhar A Abd El-Megeed
Keyword(s):  
Mechanical Properties ◽  
Gamma Radiation ◽  
Natural Rubber ◽  
Irradiation Dose ◽  
Carbon Fiber Composites ◽  
Fiber Loading ◽  
Morphological Studies ◽  
Short Carbon ◽  
Thermal Stability Of ◽  
Different Doses

Natural rubber was reinforced with a short carbon fibers (SCFs) at different concentrations (0–20 part per hundred part of rubber (phr)). The composites were vulcanized by sulfur, then subjected to gamma radiation at different doses up to 40 kGy. Physico-mechanical properties of composites were studied. Also, thermogravimetric analysis was used to investigate the influence of the incorporation of SCF on the thermal properties of prepared composites. It was observed that the mechanical properties like tensile strength increases with increasing irradiation dose up to 30 kGy and fiber loading up to 15 phr, meanwhile the hardness and modulus increase with increasing fiber loading, but not affected by irradiation dose. Thermal stability of composites was increased by fiber loading content at constant irradiation dose. The morphological studies were made by means of scanning electron microscopy to investigate the structure change caused by the incorporation of SCF.

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