Crystalline Structure Changes of Poly(vinylidene fluoride) Fibers during Stretching Process

Jing-jing Yan; Chang-fa Xiao; Chun Wang; Hao Fu; Shu-lin An; Ya-ming Jiang

doi:10.11777/j.issn1000-3304.2018.18261

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Crystalline Structure Changes of Poly(vinylidene fluoride) Fibers during Stretching Process

Research Article | 更新时间：2021-01-26

- Crystalline Structure Changes of Poly(vinylidene fluoride) Fibers during Stretching Process
- Acta Polymerica Sinica Vol. 50, Issue 7, Pages: 752-760(2019)
- 作者机构：
  
  天津工业大学纺织科学与工程学院省部共建分离膜与膜过程国家重点实验室　天津 300387
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18261
  CLC：
- Published：2019-7，
  
  Published Online：1 February 2019，
  
  Received：3 December 2018，
  
  Revised：26 December 2018，
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Jing-jing Yan, Chang-fa Xiao, Chun Wang, Hao Fu, Shu-lin An, Ya-ming Jiang. Crystalline Structure Changes of Poly(vinylidene fluoride) Fibers during Stretching Process. [J]. Acta Polymerica Sinica 50(7):752-760(2019)
DOI：

Jing-jing Yan, Chang-fa Xiao, Chun Wang, Hao Fu, Shu-lin An, Ya-ming Jiang. Crystalline Structure Changes of Poly(vinylidene fluoride) Fibers during Stretching Process. [J]. Acta Polymerica Sinica 50(7):752-760(2019) DOI： 10.11777/j.issn1000-3304.2018.18261.

摘要

采用熔融纺丝法制备不同喷丝头拉伸比聚偏氟乙烯(PVDF)初生纤维，再经后拉伸制得不同后拉伸比PVDF纤维. 对纤维在不同拉伸过程中晶体结构研究表明：随喷丝头拉伸比增大，纤维结晶度、

晶型取向、大分子取向均增加，且喷丝头拉伸比达到一定程度后，变化更显著；而随后拉伸比增大，纤维结晶度无显著变化，但后拉伸较喷丝头拉伸更有利于

晶型向

晶型转变，且后拉伸比越高越易形成

晶型，当后拉伸使纤维进入直径均匀变小阶段后，

晶型取向效果更明显；后拉伸比为11时，

晶型含量达82.85%，

(110/200)晶面取向因子达0.83.

Abstract

The poly(vinylidene fluoride) (PVDF) as-spun fibers with different spin-stretching ratios were fabricated

via

melt-spinning method using plunger spinning machine. PVDF fibers with different post-stretching ratios were subsequently obtained by post-stretching method under the thermal treatment condition. The crystal and orientation structure of the fibers were investigated by X-ray diffraction (XRD)

differential scanning calorimetry (DSC)

polarizing optical microscopy (POM) and so on. The results indicated the orientation of

crystal and macromolecular increased with the increasing spin-stretching ratio. Furthermore

as the higher spin-stretching ratio increased

the degree of crystallinity of as-spun fiber was prone to perfection. Furthermore

according to the POM photomicrograph

the horizon of extinction position was almost entirely black

and the horizon of diagonal position was getting brighter

due to the increase of the anisotropy of as-spun fibers. This was attributed that the irregular fiber macromolecules were stretched to regular structure. When spin-stretching ratio was 330

the crystallinity of as-spun fiber could reach 56.38% and the orientation factor of

(110/200) crystal plane was up to 0.89. In terms of post-stretching technique

the stretching ratios had no significant influence on the degree of crystallinity. However

the post-stretching process played a positive role in the transition of the crystal phase from

. The molecular chains of the fibers are easier to slip and arrange regularly along the fiber axis during spin-stretching process. The conformation was easier to transfer from

phase to

phase owing to the segmental motion of molecular chains during post-stretching process. Especially

the orientation of

crystal was also improved at the same time. Specially

when the post-stretching was up to the stage of uniform reduction of fiber diameter

the orientation of

crystal retained a high level. When post-stretching ratio was 11

the content of

crystal could account for 82.85% and the orientation factor of

(110/200) crystal plane was up to 0.83.

关键词

聚偏氟乙烯纤维喷丝头拉伸后拉伸取向晶体结构

Keywords

Poly(vinylidene fluoride) fiberSpin-stretchingPost-stretchingOrientationCrystal structure

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