The Influence of Hard Segment Crystallizability on the Structure and Properties of Block Copolyether-ester Elastomers |
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Page 16
... approximately 15-25 Å up to 100 Å thick ( Buck , et al . , 1974 ) . X - ray diffraction studies indicate that the PTMT segments in copolyether - esters crystallize in the a crystal structure ( the unstressed form ) of the PTMT ...
... approximately 15-25 Å up to 100 Å thick ( Buck , et al . , 1974 ) . X - ray diffraction studies indicate that the PTMT segments in copolyether - esters crystallize in the a crystal structure ( the unstressed form ) of the PTMT ...
Page 163
... approximately 4 hr . The exponent , m , begins at a value of approximately 2.4 and increases to a value of 4.0 in 2.5 hr , after which it remains constant . The inclusion of the interfacial thickness parameter , σ , only improved the ...
... approximately 4 hr . The exponent , m , begins at a value of approximately 2.4 and increases to a value of 4.0 in 2.5 hr , after which it remains constant . The inclusion of the interfacial thickness parameter , σ , only improved the ...
Page 168
... approximately 12 hr , although the annealing endotherm continues to increase beyond this time . The soft phase glass transition midpoint temperature of the polymer is observed to decrease gradually over this 12 hour period from ...
... approximately 12 hr , although the annealing endotherm continues to increase beyond this time . The soft phase glass transition midpoint temperature of the polymer is observed to decrease gradually over this 12 hour period from ...
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