Citation: 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, ;2019, 50(7): 752-760. doi: 10.11777/j.issn1000-3304.2018.18261 shu

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

School of Textile Science and Engineering, Tianjin Polytechnic University, State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin 300387

Corresponding author: Chang-fa Xiao, xiaochangfa@163.com
Received Date: 3 December 2018
Revised Date: 26 December 2018
Available Online: 1 February 2019

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 α 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 α(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 α to β. 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 α phase to β phase owing to the segmental motion of molecular chains during post-stretching process. Especially, the orientation of β 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 β crystal retained a high level. When post-stretching ratio was 11, the content of β crystal could account for 82.85% and the orientation factor of β(110/200) crystal plane was up to 0.83.
- Poly(vinylidene fluoride) fiber,
- Spin-stretching,
- Post-stretching,
- Orientation,
- Crystal structure
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