文献类型：期刊文献

英文题名：Structural responses of electrospun PVDF fibers induced by specific stretching and ensuing heating

作者：Li, Xiang[1,4];Zhang, Congyan[1];Han, Yanna[1];Lin, Jinyou[2,3]

机构：[1]Shaoxing Univ, Yuanpei Coll, Key Lab Funct Fibers & Intelligent Text, Shaoxing, Peoples R China;[2]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai, Peoples R China;[3]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China;[4]Shaoxing Univ, YuanPei Coll, Key Lab Funct Fibers & Intelligent Text, Shaoxing 312000, Zhejiang, Peoples R China

年份：2024

外文期刊名：JOURNAL OF POLYMER SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001140572000001)、、EI(收录号：20240215365728)、Scopus(收录号：2-s2.0-85181923469)、WOS

基金：The authors acknowledge financial support from the Natural Science Foundation of Zhejiang Province (No. LQ22A020011), the National Natural Science Foundation of China (No. 52173026), and the Natural Science Foundation of Zhejiang Province (Nos. LHY22E080001, LGG19E030004).

语种：英文

外文关键词：electrospinning; mechanical property; PVDF fibers; stretching; structural responses

外文摘要：Microstructure of electrospun fibers is often invoked to explain their properties but that is challenging to quantify properly. The electrospun PVDF fibers being rich in the beta-phase crystal due to excellent piezoelectric properties are promising energy-harvesting materials for wearable and implantable applications. In this work, structural responses of electrospun PVDF fibers were investigated under the conditions of specific stretching at 25 degrees C and ensuing heating from 25 to 170 degrees C at strains of 5%, 10%, 20%, respectively, using the in situ WAXD with a thermos-mechanical coupled equipment. In this process, the fiber morphology, and the crystal orientation, the crystal structure, the beta-phase content, as well as mechanical property of elctrospun PVDF fibers were studied. It is found that the specific stretching affects the beta-phase crystal more than ensuing heating when the heating temperature is lower than the melting temperature of the fibers. Moreover, after 20% stretching and ensuing heating to 150 degrees C, the tensile strength of electrospun PVDF fibers membrane can rise to 12.8 MPa, which is more than three times that of the pristine fibers, which is attributed to the higher crystal orientation and beta-phase content, along with the alignment of the fibers. Therefore, structural responses of electrospun PVDF fibers induced by specific stretching and ensuing heating are propitious to explain and tailor their properties in practical applications, which also gives potential insights into other fibers.