当前位置: X-MOL 学术Iran. Polym. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effects of gamma irradiation on properties of PLA/flax composites
Iranian Polymer Journal ( IF 3.1 ) Pub Date : 2020-05-04 , DOI: 10.1007/s13726-020-00820-w
Xuelian Xia , Xiangyang Shi , Wentao Liu , Suqin He , Chengshen Zhu , Hao Liu

Polylactic acid (PLA) is a well-known renewable and biodegradable polymer but is still limited by its low heat distortion temperature and brittleness. In this study, a PLA/flax composite containing flax fiber strands (5 wt%) was prepared through melt-compounding process followed by gamma irradiation at doses ranging from 0 to 20 kGy in the presence of a small amount of triallyl isocyanurate (TAIC) as cross-linking agent. The gel fraction of the composite was tested, and the datum showed that the gel fraction sharply increased first, and then slightly decreased with increasing irradiation dose. Gamma irradiation induced cross-linking of the polymer to form a three-dimensional network in the PLA/flax composite system. Irradiated composite could only swell instead of dissolving completely in chloroform, and the swollen morphology correlated with irradiation dose. The thermal stability of the PLA/flax composite was characterized using thermogravimetric analysis (TGA) temperature, and dimensional stability. Overall, irradiation modification improved the thermal resistance and dimensional stability of PLA composites. The mechanical property tests of the irradiated composites revealed increased tensile and impact strengths, reduced elongation-at-break, and unchanged tensile modulus. The analysis of water absorption of the composite demonstrated that the irradiation cross-linking induced no obvious effect on water absorption. Irradiation cross-linking modification cannot change the hydrophilicity or hydrophobicity of PLA composites. Overall, these findings look promising for future use in reinforcement and improvement of the thermal resistance of PLA/flax composites.

中文翻译:

γ射线辐照对PLA /亚麻复合材料性能的影响

聚乳酸(PLA)是一种众所周知的可再生和可生物降解的聚合物,但仍受其低热变形温度和脆性的限制。在这项研究中,通过在少量的三烯丙基异氰脲酸酯(TAIC)存在下,通过熔融复合工艺,然后以0至20 kGy的剂量进行伽马射线辐照,制备了包含亚麻纤维线(5 wt%)的PLA /亚麻复合材料作为交联剂。测试了复合材料的凝胶分数,数据表明,随着辐射剂量的增加,凝胶分数先急剧增加,然后略有下降。γ辐照引起聚合物的交联,从而在PLA /亚麻复合体系中形成三维网络。辐照的复合材料只能膨胀,而不能完全溶解在氯仿中,肿胀的形态与照射剂量有关。使用热重分析(TGA)温度和尺寸稳定性来表征PLA /亚麻复合材料的热稳定性。总体而言,辐照改性改善了PLA复合材料的耐热性和尺寸稳定性。辐照复合材料的机械性能测试表明,其拉伸强度和冲击强度有所提高,断裂伸长率降低,并且拉伸模量保持不变。复合材料的吸水率分析表明,辐照交联对吸水率没有明显影响。辐照交联改性不能改变PLA复合材料的亲水性或疏水性。总体,
更新日期:2020-05-04
down
wechat
bug