2022
DOI: 10.1021/acs.macromol.2c01992
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Spatial Distribution of the Amorphous Region Constrained by Polymer Crystallites

Abstract: Many studies have supported the existence of the amorphous region with reduced mobility induced by crystallization in semicrystalline polymers. However, the spatial distribution of the amorphous region with reduced mobility (rigid amorphous region) has not been fully clarified. Therefore, we applied contrast variation small-angle X-ray scattering (CV-SAXS) to the swollen ethyleneoctene copolymer with granular crystallites to clarify the spatial distribution of the rigid amorphous region. The analysis with CV-S… Show more

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“…Consequently, far above the glass transition temperature (about −50 °C), the presence of a relatively small endothermal heat-flow peak of each specimen around the temperature of 60 °C (clearly shown in the insertion diagram) is considered as an upper glass transition owing to the transition relaxation [ 36 ]. This phenomenon has always appeared in many other high-performance semicrystalline polymers as well [ 50 , 51 ]. Regarding the step-like transitions site of sample BONs-3 at about 130 °C, it can be explained by the growth of more tightly adjacent re-entry foldings in the geometrically restricted regions [ 52 ], which take into account secondary crystals corresponding to the relatively weak intensity of (200) β reflection.…”
Section: Results and Discussion Of Bonsmentioning
confidence: 98%
“…Consequently, far above the glass transition temperature (about −50 °C), the presence of a relatively small endothermal heat-flow peak of each specimen around the temperature of 60 °C (clearly shown in the insertion diagram) is considered as an upper glass transition owing to the transition relaxation [ 36 ]. This phenomenon has always appeared in many other high-performance semicrystalline polymers as well [ 50 , 51 ]. Regarding the step-like transitions site of sample BONs-3 at about 130 °C, it can be explained by the growth of more tightly adjacent re-entry foldings in the geometrically restricted regions [ 52 ], which take into account secondary crystals corresponding to the relatively weak intensity of (200) β reflection.…”
Section: Results and Discussion Of Bonsmentioning
confidence: 98%