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Effect of acrylonitrile content of SAN on the bending morphology and its quantitative variation inside crystals of PCL / SAN blends confined in thin films
Author(s) -
Mamun Al
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200548
Subject(s) - crystallization , materials science , morphology (biology) , raman spectroscopy , crystal (programming language) , chemical engineering , polymer blend , acrylonitrile , bending , composite material , polymer chemistry , polymer , copolymer , geology , optics , paleontology , physics , computer science , engineering , programming language
The effect of acrylonitrile content of SAN on the bending morphology of PCL/SAN blends was studied. The blends were prepared from solution with different compositions, and isothermally crystallized at a certain temperature. During crystallization at 45°C, the truncated lozenge‐shaped morphology of the PCL crystals being modified to regular/inverted S‐ or C‐shaped morphology for PCL/SAN blends with 9.5–25% AN in SAN. The bending curvature increases by lowering the crystallization temperature, and the growth rate of PCL decreases with SAN reflecting the miscible nature of the blends. For blends with 30% AN in SAN, mix morphologies with different crystal growth rates reflects the immiscible nature of the blends. Raman spectroscopy reveals at lower crystallization temperature, for miscible blends, a small amount of SAN is retained in the PCL crystal, with a regular increase in concentration from the midpoint to the edge of the crystal, whereas a homogeneous distribution of SAN is found in immiscible blends. Those distribution of SAN are completely absent at higher crystallization temperatures due to a higher crystallographic order of the PCL crystals.