State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610065, People's Republic of China.
College of Physical Science and Technology, Sichuan University, Chengdu 610065, People's Republic of China.
Nanoscale Res Lett. 2014 May 7;9(1):215. doi: 10.1186/1556-276X-9-215. eCollection 2014.
This study investigated ageing-resistant properties of carboxyl-terminated polyester (polyethylene glycol terephthalate) composites modified with nanoscale titanium dioxide particles (nano-TiO2). The nano-TiO2 was pretreated by a dry coating method, with aluminate coupling agent as a functional grafting additive. The agglomeration resistance was evaluated, which exhibited significant improvement for the modified nanoparticles. Then, the effects of the modified nano-TiO2 on the crosslinking and ageing-resistant properties of the composites were studied. With a real-time Fourier transform infrared (FT-IR) measurement, the nano-TiO2 displayed promoting effect on the crosslinking of polyester resin with triglycidyl isocyanurate (TGIC) as crosslinking agent. Moreover, the gloss retention, colour aberration and the surface morphologies of the composites during accelerated UV ageing (1500 hours) were investigated. The results demonstrated much less degree of ageing degradation for the nanocomposites, indicating an important role of the nano-TiO2 in improving the ageing-resistant properties of synthetic polymer composites.
本研究调查了用纳米二氧化钛颗粒（纳米 TiO2）改性的端羧基聚酯（聚对苯二甲酸乙二醇酯）复合材料的耐老化性能。纳米 TiO2 采用干法涂覆法进行预处理，并用铝酸酯偶联剂作为功能接枝添加剂。评估了抗团聚性能，结果表明改性纳米颗粒的抗团聚性能有显著提高。然后，研究了改性纳米 TiO2 对复合材料的交联和耐老化性能的影响。采用实时傅里叶变换红外（FT-IR）测量，发现纳米 TiO2 对以三缩水甘油异氰尿酸酯（TGIC）为交联剂的聚酯树脂的交联具有促进作用。此外，还研究了复合材料在加速 UV 老化（1500 小时）过程中的光泽保持率、色差和表面形貌。结果表明，纳米复合材料的老化降解程度要小得多，表明纳米 TiO2 在提高合成聚合物复合材料的耐老化性能方面发挥了重要作用。
