Citation: Bi-qiang Jin, Xin-peng Li, Ming Jin, Da-shan Mi, Fei-fei Wang, Chao Xia, Jie Zhang. 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 shu

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

Bi-qiang Jin ¹ ,
Xin-peng Li ¹ ,
Ming Jin ¹ ,
Da-shan Mi ¹ ,
Fei-fei Wang ¹ ,
Chao Xia ¹ ,
Jie Zhang ^1,,

1.
State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China

Corresponding author: Jie Zhang,
Received Date: 5 August 2015
Revised Date: 21 September 2015

The crystallization behavior, rheological behavior, mechanical properties and microstructures of injection molded isotactic polypropylene (iPP), polypropylene random copolymer (co-PP) and iPP/co-PP blends were investigated. Differential scanning calorimetry (DSC) and dynamic rheological analysis illustrated that iPP and co-PP were compatible in the blends and co-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 iPP/co-PP blends (10 wt% co-PP + 90 wt% iPP and 30 wt% co-PP + 70 wt% iPP) radically decreased after the incorporation of co-PP. During crystallization, the molecular chain segments of co-PP could penetrate iPP 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 iPP/co-PP blends is quasi ductile fracture by multiple crazes. Our work discovered that the blends containing 10 wt% and 30 wt% of co-PP exhibited prominent toughness and reinforcement.
- Network-like,
- Morphology,
- Toughness,
- Polypropylene random copolymer
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