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首页> 外文期刊>Journal of Applied Polymer Science >Solid state NMR analysis of poly(L-lactide) random copolymer with poly(ε-caprolactone) and its reactive extrusion process
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Solid state NMR analysis of poly(L-lactide) random copolymer with poly(ε-caprolactone) and its reactive extrusion process

机译：聚（L-丙交酯）无规共聚物与聚（ε-己内酯）的固态NMR分析及其反应挤出工艺

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摘要

A random copolymer based on poly(L-lactide) (PLA) with poly(ε- caprolactone) (PCL) was prepared and characterized by mechanical testing and solid state NMR, compared with a polymer blend. For a monofilament sample consisting of PLA/PCL random copolymer, there were negative correlations between the CL content and the mechanical properties: tensile strength, tensile elastic modulus, flexural rigidity, and flexural hysteresis decreased with increasing CL content. In contrast, the mechanical properties of the polymer blend were only slightly changed by addition of the CL unit. For the random copolymer, the addition of a small amount of CL reduced relaxation times, T_1C and T_(1ρ)H, gradually. The T_1C and T_(1ρ)H values correlated closely with the tensile elastic modulus and the tensile strength, respectively.
机译：制备了基于聚（L-丙交酯）（PLA）和聚（ε-己内酯）（PCL）的无规共聚物，并通过机械测试和固态NMR与聚合物共混物进行了比较。对于由PLA / PCL无规共聚物组成的单丝样品，CL含量与机械性能之间呈负相关关系：抗张强度，拉伸弹性模量，弯曲刚度和弯曲滞后性随CL含量的增加而降低。相反，通过添加CL单元，聚合物共混物的机械性能仅轻微改变。对于无规共聚物，添加少量的CL逐渐降低了弛豫时间T_1C和T_（1ρ）H。 T_1C和T_（1ρ）H值分别与拉伸弹性模量和拉伸强度密切相关。

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