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The effect of gamma-irradiation on morphology and properties of melt-spun poly (lactic acid)/cellulose fibers
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-11-15 , DOI: 10.1016/j.polymdegradstab.2018.11.014
Tassadit Aouat , Mustapha Kaci , José-Marie Lopez-Cuesta , Eric Devaux , Mohamed Mahlous

The effect of gamma irradiation on both morphology and properties of neat poly(lactic acid) (PLA), PLA/microcrystalline cellulose (MCC) and PLA/cellulose nanowhiskers (CNW) fibers loaded at 1 wt% filler content was investigated in presence of PLA-grafted maleic anhydride (PLA-g-MA) used as the compatibilizer. Multifilament yarns were prepared by a melt-spinning process and subjected to gamma irradiation at various doses from 5 to 30 kGy keeping the dose rate at 1.92 kGy/h under ambient conditions. Chemical structure, morphology and property changes induced by gamma irradiation on the samples were evaluated by several techniques considering the filler aspect ratio effect. The results showed a dose-related increase in the scission index (SI) of the irradiated samples whatever the filler size, while thermal and tensile properties significantly decreased. However, the incorporation of cellulosic fillers in PLA fibers, in particular MCC, was found to hinder the radiolytic degradation process of the irradiated samples.



中文翻译:

γ辐照对熔纺聚乳酸/纤维素纤维形态和性能的影响

在存在PLA的情况下,研究了γ辐照对填充量为1 wt%的纯聚乳酸(PLA),PLA /微晶纤维素(MCC)和PLA /纤维素纳米晶须(CNW)纤维的形态和性能的影响。接枝的马来酸酐(PLA -g-MA)用作增容剂。通过熔纺工艺制备复丝纱,并在环境条件下以5至30 kGy的各种剂量进行伽马射线辐照,以保持剂量率在1.92 kGy / h。考虑到填料纵横比效应,通过几种技术评估了由伽马射线辐照在样品上引起的化学结构,形态和性能变化。结果表明,无论填料尺寸如何,被辐照样品的断裂指数(SI)均呈剂量相关性增加,而热和拉伸性能显着下降。但是,发现在PLA纤维(特别是MCC)中掺入纤维素填料会阻碍被辐照样品的辐射降解过程。

更新日期:2018-11-15
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