Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure

Bi-qiang Jin; Xin-peng Li; Ming Jin; Da-shan Mi; Fei-fei Wang; Chao Xia; Jie Zhang

doi:10.1007/s10118-016-1747-y

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Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure

Updated：2021-06-21

- Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure
- Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure
- Chinese Journal of Polymer Science 2016年34卷第2期页码：164-173
- Affiliations：
  
  State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  *Jie Zhang (张杰), E-mail: zhangjie@scu.edu.cn
- Funds：
- DOI：10.1007/s10118-016-1747-y
  中图分类号：
- 收稿：2015-08-05，
  
  修回：2015-09-21，
  
  录用：2015-10-23，
  
  纸质出版：2016-02
- Accepted：
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Bi-qiang Jin, Xin-peng Li, Ming Jin, 等. Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure[J]. Chinese Journal of Polymer Science, 2016,34(2):164-173.

Bi-qiang Jin, Xin-peng Li, Ming Jin, et al. Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure[J]. Chinese Journal of Polymer Science, 2016, 34(2): 164-173. DOI: 10.1007/s10118-016-1747-y.
Bi-qiang Jin, Xin-peng Li, Ming Jin, 等. Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure[J]. Chinese Journal of Polymer Science, 2016,34(2):164-173. DOI： 10.1007/s10118-016-1747-y.

Bi-qiang Jin, Xin-peng Li, Ming Jin, et al. Enhanced Mechanics in Injection Molded Isotactic Polypropylene/Polypropylene Random Copolymer Blends via Introducing Network-like Crystal Structure[J]. Chinese Journal of Polymer Science, 2016, 34(2): 164-173. DOI: 10.1007/s10118-016-1747-y. DOI：

摘要

Abstract

The crystallization behavior

rheological behavior

mechanical properties and microstructures of injection molded isotactic polypropylene (

PP)

polypropylene random copolymer (

-PP) and

PP/

-PP blends were investigated. Differential scanning calorimetry (DSC) and dynamic rheological analysis illustrated that iPP and co-PP were compatible in the blends and

-PP uniformly dispersed in the iPP phase. Polarizing optical microscope (POM) was adopted to observe the crystal size and morphology evolution. The results of mechanical properties and scanning electron microscopy (SEM) indicated that the crystal size of iPP in

PP/

-PP blends (10 wt%

-PP + 90 wt%

PP and 30 wt%

-PP + 70 wt%

PP) radically decreased after the incorporation of

-PP. During crystallization

the molecular chain segments of

-PP could penetrate

PP spherulites and form a network-like crystalline structure. The network-like crystal structure could effectively transmit stress and consume more energy to overcome intermolecular forces to resist stretching. In this way

the strength would improve to a certain degree. The impact fracture mechanism of

PP/

-PP blends is quasi ductile fracture by multiple crazes. Our work discovered that the blends containing 10 wt% and 30 wt% of

-PP exhibited prominent toughness and reinforcement.

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