Crystallization, Mechanical, Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker

Li Dang; Xue-ying Nai; Xin Liu; Dong-hai Zhu; Ya-ping Dong; Wu Li

doi:10.1007/s10118-017-1908-7

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Crystallization, Mechanical, Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker

Papers | Updated：2021-02-18

- Crystallization, Mechanical, Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker
- Chinese Journal of Polymer Science Vol. 35, Issue 5, Pages: 659-671(2017)
- Affiliations：
  
  a.Key Laboratory of Salt Lake Resources Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
  b.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
  c.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Wu Li (李武), E-mail:liwu2016@126.com
- Funds：
- DOI：10.1007/s10118-017-1908-7
  CLC：
- Received：18 October 2016，
  
  Revised：2016-11-24，
  
  Accepted：29 November 2016，
  
  Published：2017-05
- Accepted：
Scan QR Code
Li Dang, Xue-ying Nai, Xin Liu, et al. Crystallization, Mechanical, Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker[J]. Chinese Journal of Polymer Science, 2017, 35(5): 659-671.
DOI：

Li Dang, Xue-ying Nai, Xin Liu, et al. Crystallization, Mechanical, Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker[J]. Chinese Journal of Polymer Science, 2017, 35(5): 659-671. DOI： 10.1007/s10118-017-1908-7.

摘要

Abstract

Polypropylene (PP) composites containing magnesium oxysulfate whisker (MOSw) or lauric acid (LA) modified MOSw (LAMOSw) were prepared via melt mixing in a torque rheometer. The heterogeneous nucleating effect of LAMOSw was clearly observed in polarized light microscopy (PLM) pictures with the presence of an abundance of small spherulites. MOSw exhibited no nucleation effect and formed a few spherulites with large size. Compared with PP/MOSw composites

PP/LAMOSw exhibited better impact strength

tensile strength and nominal strain at break

ascribing to three possible reasons: (ⅰ) more

-crystal PP formed

(ⅱ) better dispersity of LAMOSw in PP matrix and (ⅲ) the plasticizing effect of LA. The results of dynamic mechanical thermal analysis (DMTA) indicated that brittleness of the PP matrix at low temperature was improved by the addition of LAMOSw

while the interfacial interactions between MOSw and PP matrix were actually weakened by LA

as evidenced by the higher tan

values over the entire range of test temperatures. In terms of the rheological properties of the composites

both the

and

′

at low frequencies increase with the addition of MOSw or LAMOSw

indicating that the PP matrix was transformed from liquid-like to solid-like. However

a network of whiskers did not form because no plateau was found in the

′

at low frequencies. With low filler content

LAMOSw produced a stronger solid-like behavior than MOSw mainly due to the better dispersion of the LAMOSw in PP matrix. However

for highly-filled composites

the

of PP/LAMOSw at low frequencies was smaller than that of PP/MOSw composite

since the particleparticle contact effect played a major role.

关键词

Keywords

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