Effect of Long Chain Branching on the Rheological Behavior, Crystallization and Mechanical Properties of Polypropylene Random Copolymer

Cao Jing; Wen Na; Zheng Yu-ying

doi:10.1007/s10118-016-1830-4

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Effect of Long Chain Branching on the Rheological Behavior, Crystallization and Mechanical Properties of Polypropylene Random Copolymer

PAPERS | Updated：2021-05-12

- Effect of Long Chain Branching on the Rheological Behavior, Crystallization and Mechanical Properties of Polypropylene Random Copolymer
- Chinese Journal of Polymer Science Vol. 34, Issue 9, Pages: 1158-1171(2016)
- Affiliations：
  
  College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China
- Author bio：
  
  Yu-ying Zheng(郑玉婴),E-mail:yyzheng@fzu.edu.cn
- Funds：
- DOI：10.1007/s10118-016-1830-4
  CLC：
- Received：06 February 2016，
  
  Revised：2016-3-18，
  
  Accepted：18 March 2016，
  
  Published：05 October 2016
- Accepted：
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Cao Jing, Wen Na, Zheng Yu-ying. Effect of Long Chain Branching on the Rheological Behavior, Crystallization and Mechanical Properties of Polypropylene Random Copolymer[J]. Chinese Journal of Polymer Science, 2016, 34(9): 1158-1171.
DOI：

Cao Jing, Wen Na, Zheng Yu-ying. Effect of Long Chain Branching on the Rheological Behavior, Crystallization and Mechanical Properties of Polypropylene Random Copolymer[J]. Chinese Journal of Polymer Science, 2016, 34(9): 1158-1171. DOI： 10.1007/s10118-016-1830-4.

摘要

Abstract

Long chain branched polypropylene random copolymers (LCB-PPRs) were prepared

via

reactive extrusion with the addition of dicumyl peroxide (DCP) and various amounts of 1

6-hexanediol diacrylate (HDDA) into PPR. Fourier transform infrared spectrometer (FTIR) was applied to confirm the existence of branching and investigate the grafting degree for the modified PPRs. Melt flow index (MFI) and oscillatory shear rheological properties including complex viscosity

storage modulus

loss tangent and the Cole-Cole plots were studied to differentiate the LCB-PPRs from linear PPR. Differential scanning calorimetry (DSC) and polarized light microscopy (PLM) were used to study the melting and crystallization behavior and the spherulite morphology

respectively. Qualitative and quantitative analyses of rheological curves demonstrated the existence of LCB. The effect of the LCB on crystalline morphology

crystallization behavior and molecular mobility

and

thereby

the mechanical properties were studied and analyzed. Due to the entanglements between molecular chains and the nucleating effect of LCB

LCB-PPRs showed higher crystallization temperature and crystallinity

higher crystallization rate

more uniformly dispersed and much smaller crystallite compared with virgin PPR

thus giving rise to significantly improve impact strength. Moreover

the LCB-PPRs exhibited the improved yield strength. The mobility of the molecular chain segments

as demonstrated by dynamic mechanical analysis (DMA)

was improved for the modified PPRs

which also contributed to the improvement of their mechanical properties.

关键词

Keywords

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