摘要
采用UVA(365 nm),UVB(308 nm),UVC(254 nm)3种不同波段的紫外光照射聚对苯撑苯并二噁唑(PBO)纤维,研究了其结构与性能的变化。结果表明:PBO纤维对UVC段紫外光十分敏感,UVB段次之,UVA段稍弱;UVC段紫外光照射PBO纤维264 h后,纤维强力保持率约为57%,纤维表面出现剥离现象,纤维内部化学键发生断裂,阻燃性能略有降低;UVB段紫外光照射264 h后,纤维强力保持率约为68%,纤维表面出现凹槽,照射288 h后纤维开始剥离,纤维内部化学键开始断裂,阻燃性能略有降低;UVA段紫外光照射264 h后,纤维强力保持率约为73%,纤维表面有凹槽产生,剥离现象不明显,纤维内部化学键几乎没有发生断裂,阻燃性能变化不大;不同波段紫外光照射下PBO纤维的极限氧指数均略有下降,影响程度相差不大。
The changes in the structure and properties of poly（ p -phenylene bezobisoxazole） （PBO） fiber were studied under ultraviolet irradiation of 365 nm（ UVA）, 308 nm（UVB） and 254 mm（UVC）. The results showed that PBO fiber was most sensi- tive to UVC, more sensitive to UVB and least sensitive to UVA; the strength retention of PBO fiber remained about 57%, the peeling phenomenon appeared on the fiber surface, the breakage of chemical bonds occurerd in the inner fiber, and the flame re- tardance slightly dropped as PBO fiber was exposed to UVC irradiation for 264 h; the strength retention of PBO fiber remained a- bout 68% and grooves appeared on the fiber surface after 264-h UVB irradiation when the fiber surface started to peel, the chemi- cal bonds aslo began to break and the flame retardancy slightly dropped after 288-h UVB irradiation; the strength retention reached about 73%, grooves appeared on the fiber surface with no obvious peeling, the chemical bonds hardly broke in the inner fiber, and the flame retardancy did not change much after 264-h UVA irradiation; the ultraviolet irradiation of different wave- length made the limiting oxygen index of PBO fiber slightly decrease in nearly the same degree.
出处
《合成纤维工业》
CAS
2015年第5期12-15,共4页
China Synthetic Fiber Industry
关键词
聚对苯撑苯并二噁唑纤维
紫外光
波长
力学性能
阻燃性能
表面结构
poly （ p -phenylene benzobisoxazole） fiber
ultraviolet
wavelength
mechanical properties
flame retardance
surface structure
