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Toughened High-Flow Polypropylene with Polyolefin-based Elastomers.

Xiong Wang1, Sheng Hu2, Yi Guo1

  • 1Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, China.

Polymers
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

Three polyolefin-based elastomers (PBEs) were investigated to enhance polypropylene (PP) toughness. Ethylene/propylene random copolymers offered the best balance of impact strength and transparency in PP blends.

Keywords:
polyolefin elastomer (POE), olefin block copolymer (OBC), propylene-based elastomerpolyolefin-based elastomerpolypropylenetoughening effect

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Area of Science:

  • Polymer Science
  • Materials Science
  • Materials Engineering

Background:

  • Polyolefins, particularly polypropylene (PP), are widely used commodity polymers.
  • Improving the toughness of high-flow polypropylene is crucial for enhanced performance in various applications.
  • Polyolefin-based elastomers (PBEs) are potential candidates for toughening PP.

Purpose of the Study:

  • To investigate the toughening mechanisms of three distinct PBEs in high-flow polypropylene.
  • To elucidate the structure-property relationships of PP/PBE blends.
  • To evaluate the impact of different PBEs on mechanical, thermal, optical, and morphological properties.

Main Methods:

  • Characterization of PBE microstructures using Gel Permeation Chromatography (GPC), 13C Nuclear Magnetic Resonance (NMR), Temperature Rising Elution Fractionation (TREF), and Differential Scanning Calorimetry (DSC).
  • Preparation and analysis of Polypropylene/Polyolefin-based elastomer (PP/PBE) blends.
  • Evaluation of mechanical properties (Izod impact strength, flexural modulus), thermal properties (Heat Deflection Temperature - HDT), optical properties (transparency), and morphology.

Main Results:

  • All three PBEs effectively enhanced the Izod impact strength of PP, albeit with a reduction in stiffness.
  • Two PBEs (PBE-1 and PBE-2) demonstrated a good stiffness-toughness balance with a flexural modulus of ~1700 MPa, HDT of ~110 °C, and impact strength of 3.6 kJ/m2, attributed to distinct rubber phases and refined crystalline structures.
  • An ethylene/propylene random copolymer (PBE-4) showed no obvious phase separation, leading to superior toughness (4.2 kJ/m2) and excellent optical transparency due to good compatibility with isotactic PP.

Conclusions:

  • Polyolefin-based elastomers can significantly improve the impact resistance of polypropylene.
  • Olefin block copolymers and ethylene/propylene random copolymers offer different toughening mechanisms and property profiles.
  • Ethylene/propylene random copolymers exhibit excellent potential for simultaneously enhancing toughness and transparency in polypropylene blends.