EFFECT OF MULTIFUNCTIONAL MONOMER ON RHEOLOGICAL BEHAVIOR FOR MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE

GUO Min; YUAN Weiheng; LIU Yiqun

doi:10.3724/SP.J.1105.2010.09251

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EFFECT OF MULTIFUNCTIONAL MONOMER ON RHEOLOGICAL BEHAVIOR FOR MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE

Research Article | 更新时间：2021-03-19

- EFFECT OF MULTIFUNCTIONAL MONOMER ON RHEOLOGICAL BEHAVIOR FOR MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE
- Acta Polymerica Sinica Issue 7, Pages: 819-826(2010)
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- DOI：10.3724/SP.J.1105.2010.09251
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- Published：20 July 2010，
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GUO Min, YUAN Weiheng, LIU Yiqun. EFFECT OF MULTIFUNCTIONAL MONOMER ON RHEOLOGICAL BEHAVIOR FOR MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE. [J]. Acta Polymerica Sinica (7):819-826(2010)
DOI：

GUO Min, YUAN Weiheng, LIU Yiqun. EFFECT OF MULTIFUNCTIONAL MONOMER ON RHEOLOGICAL BEHAVIOR FOR MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE. [J]. Acta Polymerica Sinica (7):819-826(2010) DOI： 10.3724/SP.J.1105.2010.09251.

摘要

研究了多官能团辅助单体偏苯三酸三丙烯酯（TATM）对马来酸酐接枝聚丙烯的熔体流动速率（MFR）和流变行为的影响.当以不含抗氧剂的聚丙烯粉料为原料时，TATM的加入对稳定接枝产物MFR的效果并不理想.但将聚丙烯粉料添加抗氧剂并造粒后，TATM的加入则可有效稳定体系的MFR，各种流变曲线显示出接枝产物的熔体弹性明显提高，说明有枝化或交联结构出现.针对PP粉料和粒料间接枝产物流变行为存在的重大差异，结合熔体自由基接枝反应的机理进行了解释.TATM能够起到稳定MFR的效果是由于其提高了接枝物的熔体弹性，从而抵消了聚丙烯熔体接枝反应中所不可避免的β断链所造成的剪切黏度下降.聚丙烯粉料和粒料中抗氧剂的差异对聚丙烯的加工降解有严重影响，造成了TATM在不同聚丙烯体系中效果的差异.

Abstract

The effect of multifunctional monomer triallyl trimellitate (TATM) on the melt flow rate (MFR) and rheological behavior of maleic anhydride grafted polypropylene (maleated PP) was studied.TATM is not effective for stabilizing the MFR of maleated PP based on PP powder not containing antioxidant.However

TATM can effectively stabilize the MFR of maleated PP when PP powder was first melt compounded with antioxidant and then used as grafting raw material.The rheological results showed that the grafted PP based on PP pellets containing antioxidant had higher melt elasticity

indicating some grafted or crosslinked structure.The remarkable differences of the rheological results between maleated PP based on polypropylene powder and polypropylene pellets are discussed through the mechanism of free radical grafting reactions.The effect of TATM on stabilizing MFR is due to its effect on increasing the melt elasticity

which can offset the inevitable reduction of shear viscosity caused by β scission reaction of PP molecules during melt grafting.The differences of antioxidant content in PP powder and PP pellets can strongly influence the PP degradation during melt processing

therefore TATM shows different effects in different PP systems.

关键词

马来酸酐接枝聚丙烯多官能团单体流变

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