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首页> 外文期刊>e-Polymers >Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends
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Thermomechanical behavior and nonisothermal crystallization kinetics of poly(ε-caprolactone) and poly(ε- caprolactone)/poly(N-vinylpyrrolidone) blends

机译：聚（ε-己内酯）和聚（ε-己内酯）/聚（N-乙烯基吡咯烷酮）共混物的热力学行为和非等温结晶动力学

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摘要

Poly(ε-caprolactone) (PCL) and PCL/Poly(N-vinylpyrrolidone) (PVP) blends are shown to have the potential to be used in a range of biomedical applications and can be processed with successive in-situ polymerization procedures. In this paper, the thermomechanical analysis of PCL and PCL/PVP blends was performed using dynamic mechanical analysis (DMA). The storage and loss moduli as a function of temperature and frequency were recorded. The nonisothermal crystallization kinetics of PCL and PCL/PVP blends were analyzed using Ozawa model and Mo-Liu equation, a combination equation of Avrami and Ozawa formulas. The Ozawa analysis failed to describe the nonisothermal crystallization behavior of blends, whereas the Mo-Liu equation successfully described the nonisothermal crystallization kinetics of PCL and PCL/PVP blends. In addition, the value of crystallization rate coefficient under nonisothermal crystallization conditions was calculated. The PCL/PVP blends compared with the pure PCL and PVP had a restrain effect on the crystallization kinetics of PCL in the blends. Combining the results of DMA and DSC, PVP effectively decreased the crystallinity of PCL and enhanced its damping properties, which indicated that PCL/PVP blends could be more suitable than PCL in some biomedical applications, as it might help in the dissipation of the mechanical energy generated by the patient movements.
机译：聚（ε-己内酯）（PCL）和PCL /聚（N-乙烯基吡咯烷酮）（PVP）共混物显示出可用于一系列生物医学应用的潜力，并可通过连续的原位聚合程序进行加工。在本文中，使用动态力学分析（DMA）对PCL和PCL / PVP混合物进行了热力学分析。记录了储能和损耗模量与温度和频率的关系。使用Ozawa模型和Mo-Liu方程（Avrami和Ozawa公式的组合方程）分析了PCL和PCL / PVP共混物的非等温结晶动力学。 Ozawa分析未能描述混合物的非等温结晶行为，而Mo-Liu方程则成功描述了PCL和PCL / PVP混合物的非等温结晶动力学。另外，计算了非等温结晶条件下的结晶速度系数的值。与纯PCL和PVP相比，PCL / PVP共混物对共混物中PCL的结晶动力学具有抑制作用。结合DMA和DSC的结果，PVP有效降低了PCL的结晶度并增强了其阻尼性能，这表明PCL / PVP混合物在某些生物医学应用中可能比PCL更合适，因为它可能有助于机械能的消散。由患者的动作产生。

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