Molecular Weight Dependence of Properties of Polyisobutylenes

Chun-bo Zhang; Bo Yang; Min-qiao Ren; Xue-fei Jia; Shen Wang; Juan Li; Long-gui Zhang; Yi-xian Wu

doi:10.11777/j.issn1000-3304.2024.24132

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Molecular Weight Dependence of Properties of Polyisobutylenes

Research Article | 更新时间：2025-01-24

- Molecular Weight Dependence of Properties of Polyisobutylenes
- Acta Polymerica Sinica Vol. 56, Issue 2, Pages: 342-349(2025)
- 作者机构：
  
  1.中石化（北京）化工研究院有限公司北京 100013
  2.中国科学院化学研究所北京 100190
  3.北京化工大学化工资源有效利用国家重点实验室北京 100029
- 作者简介：
  
  Chun-bo Zhang, E-mail: zhangchb.bjhy@sinopec.com
  Yi-xian Wu, E-mail: wuyx@mail.buct.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24132
  CLC：
- CSTR：32057.14.GFZXB.2024.7271
- Published：20 February 2025，
  
  Published Online：27 September 2024，
  
  Received：09 May 2024，
  
  Accepted：2024-06-17
- 稿件说明：
移动端阅览
CHUN-BO ZHANG, BO YANG, MIN-QIAO REN, XUE-FEI JIA, SHEN WANG, JUAN LI, LONG-GUI ZHANG, YI-XIAN WU. Molecular Weight Dependence of Properties of Polyisobutylenes. [J]. Acta polymerica sinica, 2025, 56(2): 342-349.
DOI：

CHUN-BO ZHANG, BO YANG, MIN-QIAO REN, XUE-FEI JIA, SHEN WANG, JUAN LI, LONG-GUI ZHANG, YI-XIAN WU. Molecular Weight Dependence of Properties of Polyisobutylenes. [J]. Acta polymerica sinica, 2025, 56(2): 342-349. DOI： 10.11777/j.issn1000-3304.2024.24132. CSTR： 32057.14.GFZXB.2024.7271.

摘要

对不同分子量聚异丁烯(PIB)的流变性能和拉伸行为进行研究，并利用广角X射线衍射(WAXD)技术追踪了超高分子量PIB (UHMW-PIB)在单向连续拉伸和循环拉伸过程中的结构演化. 明确了PIB的分子量与其黏度、黏弹性及弹性的对应关系. 室温时，以弹性为主的UHMW-PIB在单向拉伸过程中表现出优异的延展性；WAXD结果表明，UHMW-PIB在拉伸至大倍率时发生拉伸诱导结晶；当拉伸倍率为11倍时，重均分子量为3.28×10

g/mol的样品的结晶度约为10.7%. 将UHMW-PIB的循环拉伸行为与文献中热塑性聚氨酯相比，在拉伸倍率相同的情况下，UHMW-PIB的残余倍率更低，循环拉伸回复性能更优异. 在应力卸载过程中，UHMW-PIB中所形成的晶体逐渐熔化，逐渐恢复到非晶态. PIB的拉伸行为与其分子量、缠结结构及拉伸诱导结晶密切相关. 研究结果有望为PIB的工业应用提供参考.

Abstract

The rheological and tensile behaviors of polyisobutylenes (PIBs) with different molecular weights were studied. The structural evolution of ultrahigh molecular weight PIB (UHMW-PIB) during uniaxial and cyclic deformation was traced by wide-angle X-ray diffraction (WAXD). The molecular weight of PIB in relati

on to its viscosity

viscoelasticity and elasticity was determined. The UHMW-PIB

which is mainly elastic

exhibits excellent ductility during uniaxial tensile process. The results of WAXD indicate that the stretch-induced crystallization takes place in the UHMW-PIB when stretched to large ratio. As the stretching ratio is 11

the crystallinity of UHMW-PIB with weight-average molecular weight of 3.28×10

g/mol is as high as 10.7%. The UHMW-PIB shows good strain recovery performance after cyclic stretching. Compared to the thermoplastic polyurethane in the literature

the residual ratio of UHMW-PIB is much lower when the stretching ratio is the same. In the unloading process

the formed crystallites will gradually melt and return to the amorphous state. The tensile behavior of PIB is closely related to its molecular weight

entanglement structure and stretch-induced crystallization. This work would provide reference for the industrial application of PIB.

关键词

聚异丁烯分子量流变循环拉伸拉伸诱导结晶

Keywords

PolyisobutyleneMolecular weightRheologyCyclic deformationStretch-induced crystallization

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