TY - JOUR
T1 - Thermal behavior of ring-band versus maltese-cross spherulites
T2 - Case of monomorphic poly(ethylene adipate)
AU - Woo, Eamor M.
AU - Wu, Pi Ling
AU - Wu, Ming Chien
AU - Yan, Kai Cheng
PY - 2006/12/1
Y1 - 2006/12/1
N2 - Two types of spherulites, extinction-ring and Maltese-cross, in polyethylene adipate) (PEA) were identified, isolated, and separately characterized using DSC and polarized-light optical microscopy (POM). Ring-band spherulites in PEA occurred only in a very narrow temperature range roughly between 25 and 30°C, while Maltese-cross spherulites at 35°C and above or at 20°C and below. Thermal behavior of ring-spherulites is interpreted, analyzed, and compared to that of Maltese-cross spherulites. The thermal behavior, like the morphology, was found to be significantly different between these two types of spherulites. Among the three multiple melting peaks in PEA, the highest P3 is proven to be related to melting of lamellae in the ring-band spherulites; P1 and P2, whose relative extent of overlapping is dependent on the temperature of crystallization, are related to melting of lamellae in the regular ringless spherulites. This study has provided urgent and timely evidence for one major step further in the interpretation of relationships between the thermal behavior, melting, and extinction-ring versus Maltese-cross spherulites in semi-crystalline polymers.
AB - Two types of spherulites, extinction-ring and Maltese-cross, in polyethylene adipate) (PEA) were identified, isolated, and separately characterized using DSC and polarized-light optical microscopy (POM). Ring-band spherulites in PEA occurred only in a very narrow temperature range roughly between 25 and 30°C, while Maltese-cross spherulites at 35°C and above or at 20°C and below. Thermal behavior of ring-spherulites is interpreted, analyzed, and compared to that of Maltese-cross spherulites. The thermal behavior, like the morphology, was found to be significantly different between these two types of spherulites. Among the three multiple melting peaks in PEA, the highest P3 is proven to be related to melting of lamellae in the ring-band spherulites; P1 and P2, whose relative extent of overlapping is dependent on the temperature of crystallization, are related to melting of lamellae in the regular ringless spherulites. This study has provided urgent and timely evidence for one major step further in the interpretation of relationships between the thermal behavior, melting, and extinction-ring versus Maltese-cross spherulites in semi-crystalline polymers.
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U2 - 10.1002/macp.200600379
DO - 10.1002/macp.200600379
M3 - Article
AN - SCOPUS:33845957839
SN - 1022-1352
VL - 207
SP - 2232
EP - 2243
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
IS - 23
ER -