The Influence of Hard Segment Crystallizability on the Structure and Properties of Block Copolyether-ester Elastomers |
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Page 66
... heats of fusion , however , are much smaller than the generally accepted values of 144.5 J / g for PTMT and 192.1 J / g for PTMI ( Conix and van Kerpel , 1959 ) . Conix and van Kerpel measured the heats of fusion using a different ...
... heats of fusion , however , are much smaller than the generally accepted values of 144.5 J / g for PTMT and 192.1 J / g for PTMI ( Conix and van Kerpel , 1959 ) . Conix and van Kerpel measured the heats of fusion using a different ...
Page 77
... melting points . The heats of fusion are similar to those calculated for the copolyesters , but are much smaller than the generally accepted values . A number of other investigators have also reported low heats of fusion for PTMT ...
... melting points . The heats of fusion are similar to those calculated for the copolyesters , but are much smaller than the generally accepted values . A number of other investigators have also reported low heats of fusion for PTMT ...
Page 79
... melting point depression in a series of random copolyesters containing PTMT and minor amounts of tetramethylene sebacate , tetramethylene adipate , or tetramethylene isophthalate . They obtained heats of fusion equal to 135.9 J / g ...
... melting point depression in a series of random copolyesters containing PTMT and minor amounts of tetramethylene sebacate , tetramethylene adipate , or tetramethylene isophthalate . They obtained heats of fusion equal to 135.9 J / g ...
Contents
Copolyetherester Synthesis Sequence Length Distributions | 49 |
Investigations of the Crystallization Processes of PTMT | 136 |
Summary and Suggestions for Future Investigation | 181 |
1 other sections not shown
Common terms and phrases
1,1,2-trichloroethane 10°C/min of samples angle X-ray diffraction angle X-ray scattering annealing endotherm approximately compression molded samples cooled copolyesters copolyether-ester containing copolyether-esters copolymers crosslinks crystalline fraction crystalline weight fraction crystallized at room data for solvent decreases deformation Differential Scanning Calorimetry Dröscher DSC scans DSC traces dynamic mechanical electron density elongation function of crystallization glass transition temperature hard segment content hard segment crystallizability heating at 20°C/min heats of fusion homopolymer Hytrel Hz and 2°C/min increase influence of hard initial heating isophthalate lamellae loss modulus loss tangent mechanical properties melting endotherm melting point melting point depression molecular weight observed peak phase separation poly(tetramethylene polymer PTMI crystallization PTMI-rich PTMO PTMT crystallinity PTMT homopolymer recrystallization relaxation room temperature sequence length distribution shown in Figure Small angle X-ray solvent cast samples spherulites Stress-strain curves tensile testing terephthalate units thermoplastic elastomers Wide angle X-ray X-ray diffraction X-ray scattering profiles yield stress Young's modulus