Citation: . MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE)[J]. Chinese Journal of Polymer Science, ;2002, 20(1): 45-51. shu

MOLECULAR WEIGHT DEPENDENCE OF THE MELTING BEHAVIOR OF POLY(ε-CAPROLACTONE)

Received Date: 20 March 2001
Revised Date: 19 April 2001

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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