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Fabrication of hierarchically crystallographic morphologies in isotactic polypropylene
Author(s) -
Wang Ming,
Yuan Jia,
Luo ShiHui,
Zeng JianBing
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42703
Subject(s) - tacticity , materials science , crystallinity , thermogravimetric analysis , scanning electron microscope , differential scanning calorimetry , nucleation , optical microscope , composite material , polypropylene , ultimate tensile strength , morphology (biology) , crystallography , chemical engineering , polymer , chemistry , polymerization , physics , genetics , organic chemistry , biology , engineering , thermodynamics
The hierarchically crystallographic morphologies were fabricated in isotactic polypropylene (iPP) by controlling the stratified distribution of the nucleating agents. The α‐ and β‐nucleating agents were chosen for preparing the different crystalline modifications. The transcrystals and spherulites were found in the stratified distribution samples by polar optical microscopy (POM) and scanning electron microscope (SEM). The transcrystals grew from the surfaces of the nucleating agents filled layers and occupied most space of the pure iPP layers. The crystalline modifications and crystallinity were analyzed by X‐ray diffraction (XRD) and differential scanning calorimeter (DSC) analysis. The mechanical and thermal degradation properties of these samples with hierarchically crystallographic morphologies were investigated by tensile testing machine and thermogravimetric analysis (TGA) respectively, and showed better than that of the samples with single crystallographic morphology (spherulites). © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42703.