基于结晶调控制备低收缩聚丙烯

乔泽爽; 邹发生; 宋文波; 白红伟; 傅强

doi:10.11777/j.issn1000-3304.2022.22450

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基于结晶调控制备低收缩聚丙烯

研究论文 | 更新时间：2023-09-25

- 基于结晶调控制备低收缩聚丙烯
- Preparation of Low-shrinkage Polypropylene by Tailoring Crystallization
- 高分子学报 2023年54卷第8期页码：1186-1195
- 作者机构：
  
  1.四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都 610065
  2.中国石油化工股份有限公司北京化工研究院北京 100013
- 作者简介：
  
  E-mail: zoufs.bjhy@sinopec.com
  hongweibai@scu.edu.cn
- 基金信息：
  
  中国石油化工股份有限公司科技部资助项目(420095);上海同步辐射光源课题(2019-SSRF-PT-011426-1)
- DOI：10.11777/j.issn1000-3304.2022.22450
  中图分类号：
- 纸质出版日期：2023-08-20，
  
  网络出版日期：2023-04-19，
  
  收稿日期：2023-02-11，
  
  录用日期：2023-03-14
扫描看全文
乔泽爽,邹发生,宋文波等.基于结晶调控制备低收缩聚丙烯[J].高分子学报,2023,54(08):1186-1195.

Qiao Ze-shuang,Zou Fa-sheng,Song Wen-bo,et al.Preparation of Low-shrinkage Polypropylene by Tailoring Crystallization[J].ACTA POLYMERICA SINICA,2023,54(08):1186-1195.
乔泽爽,邹发生,宋文波等.基于结晶调控制备低收缩聚丙烯[J].高分子学报,2023,54(08):1186-1195. DOI： 10.11777/j.issn1000-3304.2022.22450.

Qiao Ze-shuang,Zou Fa-sheng,Song Wen-bo,et al.Preparation of Low-shrinkage Polypropylene by Tailoring Crystallization[J].ACTA POLYMERICA SINICA,2023,54(08):1186-1195. DOI： 10.11777/j.issn1000-3304.2022.22450.

摘要

针对等规聚丙烯(

PP)在熔融加工成型过程中会因结晶而引起收缩率大、制品尺寸精度差这一关键问题，提出基于结晶调控来有效降低成型收缩率的解决思路. 利用

成核剂(

-NA)来调控

PP的结晶结构与形貌，采用示差扫描量热仪(DSC)、X射线衍射仪(XRD)、偏光显微镜(POM)和扫描电子显微镜(SEM)等方法系统分析了

结晶对

PP注塑制品的体积收缩率和线收缩率的影响规律. 结果表明，纯

PP在结晶过程中主要形成

晶体，但少量

-NA (0.05 wt%~0.5 wt%)的加入可诱导

PP结晶形成大量密度较低的

晶体，且随

-NA含量的增加，

晶体的形貌由球晶转变为独特的捆束状晶体. 相较于普通

晶体，较低密度

晶体的形成可有效降低

PP制品沿各个方向上的收缩率. 特别地，当

晶体的含量由3.6%增加到81.7%时，制品的线收缩率可从1.7%减小到1.2%，体收缩率则从12.2%减小到10.6%，这与理论预测的结果基本一致. 进一步分析发现，

-NA可在

PP熔体中自组装形成容易沿流动方向取向的纤维状晶体，进而诱导

PP分子链取向结晶，因此制品线收缩率呈各向异性. 同时，收缩率主要取决于制品中

晶体的含量，而与结晶形貌没有明显关系. 研究结果可望为低收缩

PP新材料的开发提供依据.

Abstract

Isotactic polypropylene (

PP) suffers from high mold shrinkage mostly associated with the crystallization-induced volume shrinkage during the melt-processing

which inevitably leads to an inaccurate size of final products. In this work

a facile and effective strategy based on the crystallization manipulation has been reported to address this issue. To do this

β‍

-nucleating agent (

β‍

-NA) was utilized to tailor the crystalline structure and morphology of

PP. The effect of

-form crystallization on the volume shrinkage

and linear shrinkage of injection-molded

PP products has been analyzed by differential scanning calorimetry (DSC)

X-ray diffraction (XRD)

polarized optical microscopy (POM)

and scanning electron microscopy (SEM). The results show that

neat

PP can exclusively crystallize into

-form crystals upon non-isothermal melt-crystallization

whereas abundant

-form crystals are induced by adding small amounts (0.05 wt%‒0.5 wt%) of

-NA. Moreover

with the increase of

-NA content

the

-crystalline morphology is found to change from typical spherulites to unique bundle-like crystals. Very interesting

the predominant formation of

-form crystals can markedly reduce the shrinkage of the

PP products. Especially

when the fraction of

β‍

-form crystals is increased from 3.6% to 90.6%

the linear shrinkage of the products is found to decrease from 1.7% to 1.2%

while their volume shrinkage declines from 12.2% to 10.6%. This finding is in good accordance with the theoretical calculation. Further analysis indicates that such

-NA can self-organize into fibrillar crystals in

PP melts

which are prone to orientate along the flow direction and then induce the orientational crystallization of

PP chains

ultimately leading to the anisotropic shrinkage. Moreover

the shrinkage is heavily dependent on the fraction of

β‍

-form crystals

rather than the crystalline morphology. This work could provide a guideline for the development of low-shrinkage

PP materials.

关键词

聚丙烯结晶低收缩

Keywords

PolypropyleneCrystallizationLow shrinkage

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