| MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE) |
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| 引用本文： | 马德柱. MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE)[J]. 高分子科学, 2002, 0(1): 45-51 |
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| 作者姓名： | 马德柱 |
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| 作者单位： | Department of |
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| 摘 要： | Poly(ε-caprolactone) (PCL) with different molecular weights was synthesized and characterized by a gelpermeation chromatograph equipped with multiple detector. The melting behavior of PCL was also studied. It was found thatthe equilibrium melting points (T_m~0) of PCL samples depend on their molecular weights. Wide angle X-ray diffractionmeasurements (WAXD) and DSC measurements showed that the crystals of the high molecular weight PCLs were moreperfect than those of the low molecular weigh ones. These results demonstrate that the concentration of the end groups ofPCL chains is the main factor that influences the melting behavior. The fusion enthalpy per repeating unit (ΔH_u) wasdetermined to be 11.3 kJ/mol for PCL.
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| 关 键 词： | Poly(ε-caprolactone) Equilibrium melting point Fusion enthalpy |
| 收稿时间： | 2001-03-20 |
| 修稿时间： | 2001-04-19 |
MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE) |
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| Yi-ping Huang,Xiang Xu,Xiao-lie Luo,De-zhu Ma. MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE)[J]. Chinese Journal of Polymer Science, 2002, 0(1): 45-51 |
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| Authors: | Yi-ping Huang Xiang Xu Xiao-lie Luo De-zhu Ma |
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| Affiliation: | epartment of Polymer Science and Engineering University of Science and Technology of China; Hefei 230026 China |
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| Abstract: | Poly(ε-caprolactone) (PCL) with different molecular weights was synthesized and characterized by a gelpermeation chromatograph equipped with multiple detector. The melting behavior of PCL was also studied. It was found thatthe equilibrium melting points (Tm0) of PCL samples depend on their molecular weights. Wide angle X-ray diffractionmeasurements (WAXD) and DSC measurements showed that the crystals of the high molecular weight PCLs were more perfect than those of the low molecular weight ones.These results demonstrate that the concentration of the end groups of PCL chains is the main factor that influences the melting behavior.The fusion enthalpy per repeating unit (△Hu) was determined to be 11.3 kJmol for PCL. |
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| Keywords: | Poly（ε-caprolactone） Equilibrium melting point Fusion enthalpy |
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