High-strength and high-modulus polyvinyl alcohol fiber reinforced polylactide composites based on needlepunched nonwovens

Liu, Qingsheng and Yao, Yiqiang and Qin, Shihua and Duan, Zeping and Chen, Qiaoxian and Guo, Shiying and Xing, Li and Li, Dawei and Xu, Helan (2025) High-strength and high-modulus polyvinyl alcohol fiber reinforced polylactide composites based on needlepunched nonwovens. EXPRESS POLYMER LETTERS, 19 (10). pp. 1027-1037. ISSN 1788-618X

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Abstract

High-strength and high-modulus polyvinyl alcohol fiber (PVAF) reinforced polylactide (PLA) composites (PVAF/PLA-FRPs) with different fiber content were prepared by needlepunching nonwoven process, followed by hot pressing using PVAFs and PLA fibers as raw materials. The obtained PVAF/PLA-FRPs had excellent mechanical properties and isotropic characteristics. The tensile strength and initial modulus of machine and cross-machine direction of PVAF/PLAFRP with 50% PVAF reached 154 MPa and 5.1 GPa, and 152 MPa and 5.2 GPa, respectively. The corresponding strain at break was 15.0 and 13.9%, respectively. PVAF/PLA-FRP with 50% PVAF presented higher tensile strength and strain at break than short fiber-reinforced PLA composites reported by other groups. The tensile destruction of PVAF/PLA-FRPs was attributed to both the pulling out of PVAF from the PLA matrix and the break of PVAF. In PVAF/PLA-FRPs, PVAF acted as an effective nucleating agent to promote the crystallization of PLA.

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