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Preparation and characterization of high strength and high modulus PVA-La fiber with synthesized syndiotacticity-rich high polymerization degree PVA polymers as raw materials

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Abstract

High mechanical property poly (vinyl alcohol) (PVA) fibers have attracted tremendous attentions because of their excellent mechanical properties and has a potential application in the field of building enhancement. In this article, PVA polymer with high polymerization degree (Pn) and high Syndiotacticity-diad content (S-diad) were synthesized using vinyl acetate (VAc) and vinyl pivalate (VPi) as monomers via emulsion polymerization with water as solvent, the GPC and 1H NMR were used to characterized the Pn and S-diad of PVA polymer. Then the lanthanum chloride (LaCl3) was chosen as cross-linking and the synthesized PVA polymer as raw material for dry-wet spinning, a series of PVA fibers with high strength and high modulus have been prepared. The final PVA-La fibers were characterized through a series of experiments including of FTIR, SEM, DSC, TGA, XRD and fiber tensile tester. It turned out that the Pn and S-diad of synthesized PVA polymer were 4817 ± 76 and 56.3 ± 0.7%. With the increasing of LaCl3 content, the -OH vibration absorption peak of PVA-La composite fiber gradually increased from 3462 cm-1 to 3484 cm-1; the strength, modulus, crystallinity and orientation all increased first and then decreased. Especially, the properties of PVA-La fiber exhibited an optimal LaCl3 content of 0.8 wt%, the denier was 5.4 ± 0.5 dtex, the tensile strength and highest elastic modulus of 15.19 ± 0.5 cN/dtex and 369.21 ± 9.1cN/dtex, the elongation at break was 3.72 ± 0.4%, the crystallinity was 53.9 ± 0.6%, the orientation was 95.6 ± 0.6%.

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Acknowledgements

This work is supported by National Key Research and Development Program of China (2016YFB0303200).

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China

    Huajun Wang, Liming Zou & Chao Wang

  2. Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China

    Junwei He

  3. Department of Design and Merchandising, College of Health and Human Sciences, Colorado State University, Fort Collins, Colorado, 80523, United States

    Yan Vivian Li

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  1. Huajun Wang
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Correspondence to Liming Zou.

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Wang, H., He, J., Zou, L. et al. Preparation and characterization of high strength and high modulus PVA-La fiber with synthesized syndiotacticity-rich high polymerization degree PVA polymers as raw materials. J Polym Res 30, 216 (2023). https://doi.org/10.1007/s10965-023-03595-9

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