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  文件名称: houyi-polymer
  公司名称: 凯戈纳斯仪器商贸(上海)有限公司
  下载次数: 150
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  Abstract
The enzymatic degradation of poly(3-caprolactone) (PCL) has been investigated by using quartz crystal microbalance with dissipation (QCM-D) and surface plasmon resonance (SPR) in situ. The frequency and dissipation responses of QCM-D and the SPR signal responses can well describe the weight loss and the morphological changes of a PCL film. Our experiments reveal that the degradation has much dependence on the crystallinity and morphology of PCL. PCL with lower crystallinity (45%) and small spherulites degrades in a way of layer-by-layer. Both QCM-D and SPR measurements demonstrate that the degradation is of first-order. However, PCL with higher crystallinity (55%) and larger spherulites exhibits a more complex degradation behavior, namely, the degradation in crystalline region lags behind than that in amorphous region, leading to a microporous structure. 2007 Elsevier Ltd. All rights reserved.
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