Investigating the Nucleation Effect of DMDBS on Syndiotactic Polypropylene from the Perspective of Chain Conformation

Xin-Xin Wang; Jian-Jun Yi; Li Wang; Yuan Yuan; Jia-Chun Feng

doi:10.1007/s10118-020-2447-1

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Investigating the Nucleation Effect of DMDBS on Syndiotactic Polypropylene from the Perspective of Chain Conformation

ARTICLE | Updated：2020-06-22

- Investigating the Nucleation Effect of DMDBS on Syndiotactic Polypropylene from the Perspective of Chain Conformation
- Chinese Journal of Polymer Science Vol. 38, Issue 12, Pages: 1355-1364(2020)
- Affiliations：
  
  a.State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
  b.Laboratory for Synthetic Resin Research, Petrochina Petrochemical Research Institute, Beijing 102200, China
- Author bio：
  
  jcfeng@fudan.edu.cn
- Funds：
- DOI：10.1007/s10118-020-2447-1
  CLC：
- Received：13 March 2020，
  
  Revised：2020-4-13，
  
  Accepted：24 April 2020，
  
  Online First：22 June 2020，
  
  Published：10 September 2020
- Accepted：
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Wang, X. X.; Yi, J. J.; Wang, L.; Yuan, Y.; Feng, J. C. Investigating the nucleation effect of DMDBS on syndiotactic polypropylene from the perspective of chain conformation. Chinese J. Polym. Sci. 2020, 38, 1355–1364

Xin-Xin Wang, Jian-Jun Yi, Li Wang, et al. Investigating the Nucleation Effect of DMDBS on Syndiotactic Polypropylene from the Perspective of Chain Conformation[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1355-1364.
Wang, X. X.; Yi, J. J.; Wang, L.; Yuan, Y.; Feng, J. C. Investigating the nucleation effect of DMDBS on syndiotactic polypropylene from the perspective of chain conformation. Chinese J. Polym. Sci. 2020, 38, 1355–1364 DOI： 10.1007/s10118-020-2447-1.

Xin-Xin Wang, Jian-Jun Yi, Li Wang, et al. Investigating the Nucleation Effect of DMDBS on Syndiotactic Polypropylene from the Perspective of Chain Conformation[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1355-1364. DOI： 10.1007/s10118-020-2447-1.

摘要

Abstract

The mechanism of nucleating agents (NAs) accelerating the crystallization of semi-crystalline polymers has received continuous attention due to the extreme importance in academic research and industry application. In this work

the nucleation effect and probable mechanism of 1

3:2

4-bis(3

4-dimethylbenzylidene)sorbitol (DMDBS) on promoting the crystallization of syndiotactic polypropylene (

PP) was systematically investigated. Our results showed that DMDBS could significantly accelerate the crystallization process and did not change the crystalline form of

PP. The

in situ

infrared spectra recorded in the crystallization process showed that in pristine

PP the tttt conformers decreased and the ttgg conformers increased subsequently. In

PP/DMDBS system

DMDBS could promote the increase of ttgg conformers rather than the decrease of tttt conformers. The further analysis by 2D-IR spectra revealed that ttgg conformers increased prior to the decrease of tttt conformers in the

PP/DMDBS system comparing with pristine

PP. Considering that ttgg conformers were basic elements of helical conformation of Form I crystal for

we proposed a probable nucleation mechanism of DMDBS for

PP:DMDBS could stabilize the ttgg conformers which induced these ttgg conformers to pre-orientate and aggregate into helical conformation sequences as initial nuclei quickly and early to promote the

PP crystallization. Our work provides some new insights into the nucleation mechanism of NAs for

PP.

关键词

Keywords

references

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