摘要
首先以壳聚糖、柠檬酸、辛醛为原料,通过水热法合成了壳聚糖衍生物基聚合物碳点,然后与2,4-二羟基二苯甲酮(UV-0)、多聚甲醛通过曼尼希反应合成了一类新型壳聚糖衍生物碳点基紫外线吸收剂(P(CS-g-OC-CA)Ds-g-UV-0)。通过红外光谱、紫外吸收光谱、X射线衍射、热重分析对中间体和产物进行了结构表征与性能测试。结果表明,P(CS-g-OC-CA)Ds-g-UV-0具有良好的紫外光吸收性和耐热稳定性。将P(CS-g-OC-CA)Ds-g-UV-0应用到聚乙烯(PE)/木粉复合材料中,经过40 d的紫外加速老化实验系统研究了木塑复合材料的抗紫外老化性能,并与低分子紫外线吸收剂UV-0的应用性能进行了对比研究。对老化前后复合材料的冲击强度、羧基指数、纤维素指数以及扫描电子显微镜等性能进行了测试。结果表明,添加3%以上P(CS-g-OC-CA)Ds-g-UV-0不仅可以对PE/木粉复合材料起到良好的抗紫外光老化效果,同时还可以提高复合材料的冲击强度。
Firstly,chitosan derivative based polymer carbon dots were synthesized by hydrothermal method from chitosan,citric acid and octanal.Then,a new type of chitosan derivative carbon dots based ultraviolet absorber(P(CS-g-OC-CA)Ds-g-UV-0)was synthesized by Mannich reaction with 2,4-dihydroxybenzophenone(UV-0)and paraformaldehyde.The structure and properties of the intermediates and products were characterized by FT-IR,UV,XRD and TGA.The results show that P(CS-g-OC-CA)Ds-g-UV-0 has excellent UV absorption and thermal stability.P(CS-g-OC-CA)Ds-g-UV-0 was applied to PE/wood flour composites.After 40 d of UV accelerated aging test,the UV aging resistance of WPC was systematically studied,and the performance of WPC was compared with that of UV-0.The impact strength,carboxyl index,cellulose index and scanning electron microscope of the composites before and after aging were tested.The results show that the addition of more than 3%P(CS-g-OC-CA)Ds-g-UV-0)can not only significantly improve the UV aging resistance of the PE/wood flour composites,but also improve the impact resistance of the composites.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2021年第2期41-48,共8页
Polymer Materials Science & Engineering
基金
广西自然科学基金资助项目(2016GXNSFAA380203)。
关键词
壳聚糖衍生碳点
聚乙烯/木粉复合材料
紫外线吸收剂
紫外光老化
chitosan derivative carbon dots
polyethylene/wood powder composite
UV absorber
UV aging
