High Strength - Low Hardness Thermoplastic Elastomers from Ethylene-Butene Copolymers and Low Density Polyethylene

2008 ◽  
Vol 81 (1) ◽  
pp. 60-76 ◽  
Author(s):  
Sandeep Tembhekar ◽  
Madhuchhanda Maiti ◽  
Jinu Jacob George ◽  
Anjan Biswas ◽  
Anil K. Bhowmick ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Functional Performance ◽  
High Strength ◽  
Thermoplastic Elastomer ◽  
Ethylene Vinyl Acetate ◽  
Thermoplastic Elastomers ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Vulcanized Rubber ◽  
Rubbery Material

Abstract A thermoplastic elastomer (TPE) is a rubbery material with final properties and functional performance similar to those of a conventional vulcanized rubber at ambient temperature, yet it can be processed as a thermoplastic at elevated temperature. The main objective of the present investigation was to prepare novel olefinic thermoplastic elastomers based on blends of a thermoplastic i.e. low density polyethylene (PE) and new ethylene-butene copolymers (PEB), which would have higher strength and lower hardness compared to the existing TPEs. The 70:30 PEB: PE blend exhibited the best properties. Ethylene vinyl acetate was found to work as compatibilizer at lower loadings in these blends. The resultant blends were of low hardness (60–80 Shore A) and high strength (26–33 MPa). The interaction parameter and the morphology of the blends were the key parameters, which governed the final properties of blends.

New Thermoplastic Elastomers from Poly(Ethylene-Octene) (Engage), Poly(Ethylene-Vinyl Acetate) and Low-Density Polyethylene by Electron Beam Technology: Structural Characterization and Mechanical Properties

2001 ◽  
Vol 74 (5) ◽  
pp. 815-833 ◽  
Author(s):  
S. Chattopadhyay ◽  
T. K. Chaki ◽  
Anil K. Bhowmick
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Vinyl Acetate ◽  
Structural Changes ◽  
Ethylene Vinyl Acetate ◽  
Thermoplastic Elastomers ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Dynamic Mechanical ◽  
Poly Ethylene

Abstract New thermoplastic elastomers have been prepared from the blends of metallocene-based polyolefins (Engage) with low-density polyethylene (LDPE), and ethylene-vinyl acetate copolymers (EVA) of different grades with LDPE by electron beam modification. Structural changes of these blends with or without sensitizer in presence of irradiation have been evaluated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Scanning electron microscopy (SEM) in conjunction with atomic force microscopy (AFM) indicate the soft rubber domain in the continuous plastic matrix. Significant improvements of mechanical, dynamic mechanical and set properties have been obtained by electron beam modification, retaining its reprocessibility characteristics. Effects of ditrimethylol propane tetraacrylate (DTMPTA) as radiation sensitizer have also been evaluated from the mechanical, dynamic mechanical properties and reprocessibility.

Novel Styrenic Thermoplastic Elastomers from Blends with Special Reference to Compatibilization and Dynamic Vulcanization

2005 ◽  
Vol 78 (5) ◽  
pp. 893-909 ◽  
Author(s):  
J. D. Patel ◽  
M. Maiti ◽  
K. Naskar ◽  
Anil K. Bhowmick
Keyword(s):  
Special Reference ◽  
Interaction Parameter ◽  
Functional Performance ◽  
Thermoplastic Elastomer ◽  
Thermoplastic Elastomers ◽  
Dynamic Vulcanization ◽  
Vulcanized Rubber ◽  
Styrene Acrylonitrile ◽  
Modified Polystyrene ◽  
Styrene Butadiene

Abstract A thermoplastic elastomer (TPE) is a rubbery material with final properties and functional performance similar to those of a conventional vulcanized rubber at ambient temperature, yet it can be processed in a molten condition as a thermoplastic polymer at elevated temperature. The main objectives of the present investigation are: to prepare novel styrenic-based thermoplastic elastomers based on blends of a thermoplastic (polystyrene or styrene acrylonitrile) with a rubber (styrene butadiene or ethylene vinylacetate) and to investigate the interaction between various polymers with special reference to compatibilization via oxazoline-modified polystyrene or oxazoline-modified styrene acrylonitrile and dynamic vulcanization. Styrene acrylonitrile/ethylene vinylacetate blends are found to exhibit better overall properties, especially tensile strength, elongation at break and tension set. The solubility or interaction parameter and the morphology of the blends are the key parameters, which basically govern the final properties of blends. Physical properties of these blends have been correlated with the interaction parameter and final morphology.

Effect of Epoxide Group in Thermoplastic Elastomer on the Properties of Polyamide6 and Low-Density Polyethylene Blends

2014 ◽  
Vol 979 ◽  
pp. 143-146 ◽  
Author(s):  
Surakit Tuampoemsab ◽  
Saad Riyajan ◽  
Thritima Sritapunya ◽  
Pornsri Pakeyangkoon
Keyword(s):  
Impact Strength ◽  
Natural Rubber ◽  
Shear Viscosity ◽  
Thermoplastic Elastomer ◽  
Phase Morphology ◽  
Epoxidized Natural Rubber ◽  
Low Density Polyethylene ◽  
Dispersed Phase ◽  
Low Density ◽  
Epoxide Group

Studies on the effect of percentages of epoxide group in thermoplastic elastomer as a compatibilizer on properties of polyamide6 (PA6) and low-density polyethylene (LDPE) blends was successfully carried out in this study. Thermoplastic epoxidized natural rubber (TPENR), made from epoxidized natural rubber (ENR) and LDPE, prepared from 3 types of ENR, i.e., ENR-20, ENR-50 and ENR-70, with the ratio of 90/10 of LDPE/ENR by weight. TPENR was applied as a compatibilizer into the blend of PA6/LDPE/TPENR at the ratio by weight of 80/20/1 by using a twin screw extruder at 235°C. All test specimens were characterized for phase morphology, impact strength and rheological behaviour. Results exhibited that phase morphology of PA6/LDPE blend was incompatible. The addition of TPENR improved the compatibility of PA6/LDPE blends. With inclusion of TPENR-20 as a compatibilizer, the uniformity and the maximum reduction of dispersed phase sized were observed. Moreover, it was revealed that the rheological properties such as shear viscosity increased when compared with PA6/LDPE incompatible blend. In addition, it was found that the highest shear viscosity and also the highest impact strength were obtained for the blend of PA6/LDPE compatibilized by TPENR-20. This result was further supported by SEM images, which showed that the smallest dispersed phase size occurred when a TPENR-20 was used as a compatibilizer. So, it was clearly demonstrated in this study that the suitable type of TPENR, i.e., TPENR-20, has an effect on improving phase morphology and properties of PA6/LDPE blends.

The synthesis of organically modified layered double hydroxide and its effect on the structure and physical properties of low-density polyethylene/ethylene–vinyl acetate blends

2019 ◽  
Vol 27 (5) ◽  
pp. 287-298
Author(s):  
Xincheng Guo ◽  
Mengqi Tang ◽  
Na Wang ◽  
Lingtong Li ◽  
Yifan Wu ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Layered Double Hydroxide ◽  
Organic Anion ◽  
Ethylene Vinyl Acetate ◽  
Degree Of Crystallinity ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Organically Modified ◽  
The Matrix ◽  
Double Hydroxide

Organically modified layered double hydroxide (OM-LDH) was synthesized via anion exchange reaction and potassium monolauryl phosphate (MAPK) was used as an intercalator. The OM-LDH nanofillers were embedded into low-density polyethylene/ethylene–vinyl acetate (LDPE/EVA) via melt blending process which provided LDPE/EVA/OM-LDH nanocomposites. The structure and properties of the fabricated samples were characterized through Fourier transform infrared spectroscopy, X-ray diffraction techniques, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, and tensile testing. The results showed that the organic anion was intercalated into the interlayer region of LDH and enlarged the interlayer distance. The TGA results of the nanocomposites showed significantly improved thermal stability at a higher temperature when containing 6 wt% OM-LDH due to the good dispersion of OM-LDH in the matrix. The DSC data indicated that the degree of crystallinity was increased obviously due to the incorporation of OM-LDH in the matrix. The formation of organic side chains on the OM-LDH surface also contributed to an improvement in the interfacial adhesion, resulting in enhanced tensile strength and elongation at break compared with LDH.

scholarly journals Electrical, thermal and rheological properties of low-density polyethylene/ethylene vinyl acetate/graphene-like composite

2019 ◽  
Vol 177 ◽  
pp. 107288 ◽  
Author(s):  
Sohrab Azizi ◽  
Claudiane M. Ouellet-Plamondon ◽  
Phuong Nguyen-Tri ◽  
Michel Fréchette ◽  
Eric David
Keyword(s):  
Rheological Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density
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