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A low-molecular-weight poly(ethylene oxide) (PEO) fraction with a number-average molecular weight of 4250 g/mol was used to study the melting and recrystallization behaviors during heating. After complete crystallization at 46 °C, the PEO possessed almost exclusively once-folded chain [IF(n=1)] crystals and very few extended chain IF(n=0) crystals. Comparing differential scanning calorimetry heating...
Continuous zone-drawing and zone-annealing processes have been utilized to probe improvements in mechanical performance of melt-spun high acrylonitrile copolymer fibers (AMLON ). The as-spun fibers were zone-drawn at different ratios in a narrow temperature range of 100-105 o C and then zone-annealed. As a result of these processes, the fibers show substantial increases in tensile strength...
A thermotropic liquid crystalline (LC) polyether was synthesized by condensation polymerization of 1-(4-hydroxyphenyl-2-(2-methyl-4-hydroxypheyl)ethane) and α,ω-dibromononane, and abbreviated as MBPE-9. Multiple phase transitions were found via differential scanning calorimetry (DSC) upon heating and cooling. Based on wide-angle X-ray diffraction (WAXD) and polarized light microscopy (PLM) experiments,...
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