Polypropylene Blends with m-EPR Copolymers: Mechanical and Rheological Properties

Abstract

The effects of two metallocene ethylene-propylene-based elastomers (m-EPR1 and m-EPR2) differing in molecular mass and viscosity on mechanical, rheological and interfacial properties were compared. The m-EPR elastomers were added to iPP in 2.5, 5, 10, 15, and 20 vol.%. Torque values, elongation at break and impact strength measured of the iPP/m-EPR1 blends were higher than the iPP/m-EPR2 blends due to higher molten viscosity of m-EPR1 than m-EPR2 copolymer. Slight differences in Young moduli as well as in tensile strength at yield and at break might indicate that tensile properties of iPP/m-EPR blends were not significantly affected by difference in viscosity or molecular mass, miscibility and spherulite size. Optimization diagrams indicated the metallocene m-EPR copolymers are efficient impact modifiers for polypropylene and showed good balancing of mechanical properties in iPP/m-EPR blends.

Structural properties and mechanical performance of Salvadora persica L. (Miswak) reinforced polypropylene composites

“…The other surface free energies was found in the order of PM10 > PM5 > PM30 > PM20. Interfacial interactions (or adhesion) between the polymer matrix and the filler are an important factor which influences mechanical performance of the composites [70]. An increase in the Miswak concentration lowers the surface free energy leading to weaker reinforcement/matrix adhesion at the interface and thus to deterioration of tensile properties of the composites.…”

Nonisothermal crystallization kinetics in isotactic polypropylene/microcrystalline cellulose (II) composites

“…Isotactic polypropylene (iPP) is a semicrystalline thermoplastic polymer which has been widely used nowadays due to its attractive properties of low price, low density, good processability, fine mechanical properties, good weathering ability, excellent chemical resistance, and recyclability, making it suitable as a matrix polymeric material .…”

The Effects of the Dehumidifying Membrane Dryer for the Curing Processes of Waterborne Adhesives

“…폴리프로필렌은 가장 널리 알려져 있는 범용 열가 소성 플라스틱으로써, 용이한 가공성, 훌륭한 물리적, 열역학적 성질, 재활용 가능, 낮은 가격 때문에 특히 나 자동차, 의학 장치, 전자 등의 응용범위가 다양하 다 [1][2][3][4]. 그러나 폴리프로필렌의 낮은 표면에너지 성질 로 인해 접착소재와 피착 표면과의 상호작용이 적어 다른 극성 물질에 비해 낮은 접착력을 가지고 있다 [5,6].…”