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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Versatile Polypropylene Copolymers from a Pilot-Scale Spheripol II Process.

Xiong Wang1, Renwei Xu1, Wenqian Kang1

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

Polymers
|April 3, 2020
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Summary
This summary is machine-generated.

This study produced three polypropylene (PP) types using a Spheripol II process. High clarity PP variants achieved excellent optical transparency due to small rubber particle sizes, while others showed reduced transparency.

Keywords:
Spheripol processimpact PPimpact PP with high claritypolypropylene polymerizationrandom PP (RPP)

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science

Background:

  • Polypropylene (PP) is a versatile polymer with extensive industrial applications.
  • Controlling PP morphology is crucial for tailoring mechanical and optical properties.

Purpose of the Study:

  • To investigate the relationship between processing conditions, molecular structure, and properties of different polypropylene types.
  • To evaluate the impact of rubber phase size and distribution on optical and mechanical performance.

Main Methods:

  • Pilot-scale Spheripol II process for producing random PP, impact PP, and high-clarity impact PP.
  • Characterization using GPC, 13C NMR, TREF, XRD, and SEM to analyze molecular structure and rubber phase.
  • Testing of mechanical, thermal, and optical properties, including haze, flexural modulus, and impact strength.

Main Results:

  • High-clarity PP (PP-1 and PP-3) exhibited excellent transparency (haze < 15%) due to rubber phases ≤ 100 nm.
  • Impact PP (PP-2) showed poor transparency (haze ~ 99%) attributed to large rubber phase size (~ 1 μm) and poor thermal compatibility.
  • Variations in rubber content and sequence distribution led to distinct impact strengths and stiffness.

Conclusions:

  • Rubber phase size is a critical factor for achieving high optical transparency in polypropylene.
  • Processing strategies in the Spheripol II unit can be optimized to control PP morphology and properties.
  • High-clarity impact PP (PP-3) offers a balance of stiffness, toughness, and optical clarity.