Crystallization Behavior of Isotatic Polypropylene Under Shearing

Hong HUO; Hong-fei LI; Yan-feng MENG; Shi-chun JIANG; Li-jia AN

doi:10.14028/j.cnki.1003-3726.2004.03.009

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Crystallization Behavior of Isotatic Polypropylene Under Shearing

更新时间：2022-09-18

- Crystallization Behavior of Isotatic Polypropylene Under Shearing
- Polymer Bulletin Vol. 17, Issue 3, Pages: 58-66,83(2004)
- 作者机构：
  
  中国科学院长春应用化学研究所高分子物理与化学国家重点实验室，长春　130022
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2004.03.009
  CLC：
- Published：2004-06，
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Hong HUO, Hong-fei LI, Yan-feng MENG, Shi-chun JIANG, Li-jia AN. Crystallization Behavior of Isotatic Polypropylene Under Shearing. [J]. Polymer Bulletin 17(3):58-66,83(2004)
DOI：

Hong HUO, Hong-fei LI, Yan-feng MENG, Shi-chun JIANG, Li-jia AN. Crystallization Behavior of Isotatic Polypropylene Under Shearing. [J]. Polymer Bulletin 17(3):58-66,83(2004) DOI： 10.14028/j.cnki.1003-3726.2004.03.009.

摘要

聚丙烯是工业中应用最广泛的聚合物。聚丙烯在静态结晶时生成球晶，剪切后会生成排核，最终长成柱晶或纤维晶；在强剪切条件下会生成串晶。聚丙烯是一种存在多种晶型的聚合物，α型晶是热动力学最稳定的晶型，在一般实验条件下很难得到其他晶型；在剪切条件下聚丙烯会生成β晶-热动力学亚稳晶型。剪切会显著影响聚丙烯的结晶动力学：增加球晶的生长速率，缩短结晶诱导时间，增加活化晶核密度。人们提出了许多模型来解释剪切加速结晶动力学的实验现象，但是都有不足之处。

Abstract

Isotatic polypropylene (i-PP) is a polymorphic material with several known crystal modifications

such as monoclinic (α)

hexagonal (β) and triclinic (γ).Of these polymorphs

theαform is the thermodynamically stable crystalline modification and is predominant under common processing conditions.But iPP may form theβ-phase under shear conditions.By tensile and shear loads

polymeric molecules are stretched and oriented into rows in the molten state

the row nucleus transform into cylindrites or fibril crystallites.The effect of shear on crystallization kinetics is characterized in the following aspects: shear accelerates the crystalline growth rate

decreases the induction time and increases the activated nuclei density.The effect of flow on the kinetics can be understood by considering that the increase of the degree of order due to flow results in an effective change of the melt energy.On the basis of this concept

several empirical approaches have been proposed

but these models have some limits.

关键词

等规聚丙烯剪切结晶形态晶型结晶动力学

Keywords

iPPShearCrystallization morphologyCrystalline modificationCrystallization kinetics

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Related Institution

Institute of Chemical Materials, China Academy of Engineering Physics

Key Laboratory for Advanced Polymer Materials of Shanghai, School of Materials Science and Engineering, East China University of Science and Technology

The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University

Institute of Materials Science &Technology, Sichuan Union University

Department of Plastics Engineering,Sichuan Union University

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