偏氟乙烯-六氟丙烯共聚物纤维结构与性能表征

付浩; 肖长发; 孙乐乐; 潘健; 权全

doi:10.11777/j.issn1000-3004.2017.17158

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偏氟乙烯-六氟丙烯共聚物纤维结构与性能表征

研究论文 | 更新时间：2021-01-26

- 偏氟乙烯-六氟丙烯共聚物纤维结构与性能表征
- Structures and Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Fibers
- 高分子学报 2018年0卷第5期页码：624-631
- 作者机构：
  
  天津工业大学纺织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：
  
  E-mail: xiaochangfa@163.com
- 基金信息：
  
  国家自然科学基金(基金号 21274109)资助项目()
- DOI：10.11777/j.issn1000-3004.2017.17158
  中图分类号：
- 纸质出版日期：2018-5，
  
  收稿日期：2017-6-14，
  
  修回日期：2017-7-17，
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付浩, 肖长发, 孙乐乐, 潘健, 权全. 偏氟乙烯-六氟丙烯共聚物纤维结构与性能表征[J]. 高分子学报, 2018,0(5):624-631.

Hao Fu, Chang-fa Xiao, Le-le Sun, Jian Pan, Quan Quan. Structures and Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Fibers[J]. Acta Polymerica Sinica, 2018,0(5):624-631.
付浩, 肖长发, 孙乐乐, 潘健, 权全. 偏氟乙烯-六氟丙烯共聚物纤维结构与性能表征[J]. 高分子学报, 2018,0(5):624-631. DOI： 10.11777/j.issn1000-3004.2017.17158.

Hao Fu, Chang-fa Xiao, Le-le Sun, Jian Pan, Quan Quan. Structures and Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Fibers[J]. Acta Polymerica Sinica, 2018,0(5):624-631. DOI： 10.11777/j.issn1000-3004.2017.17158.

摘要

采用熔融纺丝技术制备偏氟乙烯-六氟丙烯共聚物[P(VDF-HFP)]初生纤维，在90 °C下分别拉伸2、4、6倍，用X射线衍射(XRD)、傅里叶红外光谱(FTIR)、热重分析(TG)、示差扫描量热分析(DSC)、拉伸试验等研究了纤维结晶、热性能、力学性能、弹性回复性能等. 结果表明：P(VDF-HFP)纤维晶区主要源于偏氟乙烯(VDF)链段，具有

和

2种晶型；随着拉伸倍数的增大，

晶型转变为

晶型并逐步增加，纤维结晶度提高；拉伸倍数为6倍时，P(VDF-HFP)纤维在氮气氛围下的热分解温度为452.3 °C，熔融温度为126.9 °C，断裂强度为502.6 MPa，定伸长为20%时，重复拉伸50次的弹性回复率为81%.

Abstract

In order to promote the development of poly(vinylidene fluoride-

-hexafluoropropylene) [P(VDF-HFP)] fibers in industry

P(VDF-HFP) fibers were fabricated

via

single screw melt spinning machine. The fibers were drawn by thermal stretching process

and the polyvinylidene fluoride (PVDF) fibers were prepared as a reference. The crystal structure

melting behavior and mechanical properties of the fibers were investigated by X-ray diffraction

Fourier transform infrared spectroscopy (FTIR)

differential scanning calorimetry (DSC)

thermogravimetric analysis (TG) and fiber strength test. The results revealed that the crystal morphology of fibers had

P(VDF-HFP) and

polymorphic forms

similar to PVDF fibers contributing to the regularly stacking of VDF moiety. The addition of HFP had an effect on crystallization

resulting in lower crystallinity in P(VDF-HFP) fibers. The increase of draw ratio not only facilitated the transition of crystalline phase from

phase

but also improved the crystallinity of the fibers. When the tensile strength was equal

a higher transformation of the crystalline form from

phase was observed in P(VDF-HFP) fibers than that in PVDF fibers

due to the steric effect in HFP structural unit. The thermal stability of the fibers was also improved and their crystallization consummated with stretching. The melting temperature and thermal decomposition temperature of P(VDF-HFP) fibers under draw ratio of 6 reached 126.9 and 452.3 °C

respectively. With the increase of the draw ratio

the tensile strength increased owing to the regular rearrangement of the molecular chains along with the axial direction

and the optimal tensile strength of P(VDF-HFP) fibers was as high as 502.6 MPa at draw raio of 6. After repeatly stretched for 50 times under constant elongation of 20%

the elastic recovery rate of P(VDF-HFP) fibers under the draw ratio of 6 was 81%

which was much higher than that of PVDF fibers

indicating that the incorporation of the HFP segments into the PVDF molecular chains was beneficial to improvement of the flexibility of the fibers.

关键词

偏氟乙烯-六氟丙烯共聚物结晶结构热性能力学性能弹性回复率

Keywords

Poly(vinylidene fluoride-co-hexafluoropropylene)Crystal structureThermal stabilityTensile strengthElastic recovery rates

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