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首页> 外文期刊>Journal of Applied Polymer Science >Effect of poly(2-ethyl-2-oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)
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Effect of poly(2-ethyl-2-oxazoline) and UV irradiation on the melt rheology and mechanical properties of poly(lactic acid)

机译：聚（2-乙基-2-恶唑啉）和UV辐射对聚（乳酸）熔体流变学和力学性能的影响

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摘要

To improve the suitability of poly(lactic acid) (PLA) for implantable devices, it ideally needs greater ductility without losses in strength. Here biodegradable poly(2-ethyl-2-oxazoline) (PEtOx) was selected as an additive to improve hydrophilicity of PLA as well as mechanical properties, while UV irradiation was considered as a bulk modification method to increase the long-term stability. The PLA blend showed improved tensile strength and elongation-at-break with small amounts of PEtOx added (1.5 wt %). Crosslinking by UV irradiation showed significant improvements with a dibutyltin dilaurate catalyst even though it produced a high degree of chain scission during melt processing. After UV irradiation for 150 h, the crosslinked material recovered mechanical properties and melt rheological properties comparable to the initial PLA-1.5%PEtOx blend (without catalyst added). Crosslinking was only possible with the added PEtOx present. A mechanism for the crosslinking reactions examined has been proposed since it has not been previously reported in the literature. (c) 2019 Wiley Periodicals, Inc.
机译：为了改善聚（乳酸）（PLA）的可植入装置的适用性，理想情况下，它可以在没有强度损失的情况下需要更大的延展性。这里，选择可生物降解的聚（2-乙基-2-恶唑啉）（Petox）作为添加剂，以改善PLA的亲水性以及机械性能，而UV辐射被认为是增加长期稳定性的本体改性方法。 PLA混合物显示出改善的拉伸强度和伸长率，少量百分比加入（1.5wt％）。通过UV辐射的交联表明，即使在熔融加工过程中产生高度的链易分泌，也表现出显着的催化剂。在UV照射150小时后，交联物质回收的机械性能和熔体流变性能与初始PLA-1.5％PETOX共混物相当（不含催化剂）。只有添加的百洛克斯存在，才能交联。已经提出了对所检查的交联反应的机制，因为它尚未在文献中报告。 （c）2019 Wiley期刊，Inc。

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