Studies on Poly(Methyl Methacrylate) (PMMA) and Thermoplastic Polyurethane (TPU) Blends

Ramaraj

J of Applied Polymer Sci

2007

Self Cite

Blends of poly(methyl methacrylate) (PMMA) with different composition viz., 5, 10, 15, and 20 wt % of ethylene-vinyl acetate (EVA) copolymer were prepared by extrusion in a corotating twin screw extruder. These prepared PMMA/EVA blends have been characterized for physicomechanical properties such as density, surface hardness, izod impact strength, tensile strength, tensile elongation, and tensile modulus. The chemical aging and heat aging tests were performed on the blends by exposing them to different chemical environments and to 808C for 168 h respectively. The influence of chemical aging and heat ageing on the mechanical performance of PMMA/ EVA blends has been studied. The PMMA/EVA blends were also characterized for thermal properties such as vicat softening point (VSP) and melt flow index (MFI). That means significant improvement in impact strength of PMMA was noticed after incorporation of EVA into PMMA matrix and it lies in the range 19.1-31.96 J/m.

Section: Introductionmentioning

confidence: 99%

Poly(methyl methacrylate) toughened by ethylene‐vinyl acetate copolymer: Physico‐mechanical, thermal, and chemical properties

Ramaraj

J of Applied Polymer Sci

2007

Self Cite

“…26 Recently, Poomalai and Siddaramaiah had reported on the improvement in impact strength and other properties of PMMA/TPU and PMMA/ethylene vinyl acetate (EVA) blends. 27,28 Reports on PMMA blends with TPEs are scanty and there is an ample scope in the modification of PMMA.…”

Section: Introductionmentioning

confidence: 98%

Investigation on thermoplastic co‐poly(ether‐ester) elastomer toughened poly(methylmethacrylate) blends

Varghese

J of Applied Polymer Sci

2008

Self Cite

Blends of poly(methyl methacrylate) (PMMA) and copoly(ether-ester) (COPE) elastomer have been prepared in different compositions namely, 95/5, 90/10, 85/15, and 80/20 wt % (PMMA/COPE), by melt mixing technique using twin screw extruder. The influence of COPE content on the mechanical properties especially impact strength, thermal behavior, and chemical resistance of PMMA have been investigated. The impact strength of the PMMA/COPE blends for all the compositions were found to be improved remarkably as compared to the virgin PMMA without affecting the other mechanical properties significantly. Various composite models, such as series model, parallel model, Halpin-Tsai equation, and Kerner's model have been used to fit the experimental mechanical properties. The effect of chemical and thermal ageing on the performance of the PMMA/COPE blends was also studied.

“…The principal limitation is its brittleness and poor solvent resistance. To improve the performance of PMMA, it has been blended with a variety of rubbers or co-polymers as reported earlier [8][9][10][11][12] . In several patents the impact strength of PMMA was improved by blending it with acrylic elastomers.…”

Section: Introductionmentioning

confidence: 99%

Ethylene Methacrylate (EMA) Co-polymer Toughened Polymethyl Methacrylate Blends: Physico-mechanical, Optical, Thermal and Chemical Properties

Varghese

Polymer-Plastics Technology and Engineering

2009

Self Cite

Polymethyl methacrylate (PMMA) was blended with ethylene methacrylate (EMA) copolymer in different compositions by melt mixing technique using Haake Rheochord twin screw extruder. The physico-mechanical, thermal, optical and chemical properties of PMMA/EMA blends were investigated with special reference to the blend compositions. The impact strength of the blends was found to increase significantly with increase in EMA content, without affecting the optical properties significantly. Optical micrograph images of the blends reveals that the rubbery phase dispersed as domains in the continuous PMMA matrix at 5 and 10 wt. % addition of EMA. The PMMA/EMA, 80/20 blend was found to exist as co-continuous system. Attempts have been made to correlate changes in morphology with mechanical properties. The influence of chemical ageing and heat ageing on the mechanical performance of PMMA/EMA blends has been studied. Four composite models such as series model, parallel model, Hapin-Tsai and Kerner's model have been used to fit the experimental tensile strength, tensile modulus and surface hardness.