摘要
研究了室温空气条件下电子束辐照剂量（范围0~1000 k Gy）对尼龙66纤维结构和力学性能的影响。利用广角X射线衍射仪、差示扫描量热仪、扫描电镜以及YG065型织物强力仪等测试方法研究了不同辐照剂量尼龙66的特性黏数、晶型结构、取向度、结晶和熔融行为,以及表面形貌和力学性能。研究结果表明,在设置的辐照剂量范围内,随着剂量的增加,纤维原有的晶型结构不变,但是,伴随辐照诱导非晶区分子链的重排,纤维的结晶度提高,取向有所改善,而结晶和熔融温度向低温偏移,熔融峰出现宽化。说明辐照主要导致尼龙66分子链氧化降解,降低其热稳定性,在电子束的撞击下,纤维表面产生了微裂纹,增加了应力集中,破坏了纤维的力学性能。
The nylon 66 fibers with different irradiation dose（ from 0 to 1000 k Gy） were prepared at room temperature in air atmosphere,and the effects of irradiation dose on the structure,morphology and properties of these obtained fibers,such as crystal structure,melting behavior and mechanical properties were investigated by WAXD,DSC,SEM and YG065 type fabric strength tester. The results indicate that with the increase of the dose in the above range,the original crystal structure of the fibers does not change. The crystallinity of fibers raises and the orientation degree of molecular chains is improved with the increasing irradiation dose,which is induced by the chain segmental rearrangement in the amorphous area causes by irradiation. Both the crystallization and melting temperatures of the fibers shift to a lower degree and the melting peak becomes wider. These results suggest that the irradiation mainly accounts for the oxidative degradation of molecular chains. The thermal stability of fibers significantly decreases after irradiation. Under the impacts of the electron beam,the micro-cracks appear on the surface of fibers leading to an increase of stress concentration and destroy the mechanical properties of these obtained fibers.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2016年第2期99-103,108,共6页
Polymer Materials Science & Engineering
基金
总后重大科研项目
关键词
电子束辐照
尼龙66
晶型结构
熔融行为
力学性能
electron beam irradiation
nylon 66
crystal structure
melting behavior
mechanical properties
