纳米SiO2接枝硬脂酸甘油酯型流滴剂/辐照聚乙烯复合材料的制备及其性能
Preparation and characterization of glyceryl stearate dropping agent modified nano SiO2/preirradiated-polyethylene graft composites

通过表面接枝技术将硬脂酸甘油酯型流滴剂（B）接枝到纳米SiO2（nano SiO2）表面，制得了nano SiO2接枝B的接枝物（nano SiO2-g-B）；将nano SiO2-g-B与预辐照聚乙烯（ir-LLDPE）熔融挤出接枝，制备了nano SiO2-g-B/ir-LLDPE复合材料。利用FTIR、SEM、DSC和加速流滴等对材料的结构和性能进行了表征。结果表明：nano SiO2-g-B/ir-LLDPE复合材料的熔融温度和结晶温度降低，其力学性能较ir-LLDPE没有较大的变化；与普通共混的方法相比，nano SiO2接枝流滴剂方法制备的nano SiO2-g-B/ir-LLDPE复合材料薄膜的流滴期最高可延长6天，达到25天，是相同条件下普通商用流滴剂薄膜的1.47倍。 In order to prepare the modified nano SiO2, the glyceryl stearate dropping agent (B) was grafted on the surface of nano SiO2 (nano SiO2-g-B) by surface grafting firstly. Then, nano SiO2-g-B/preirradiated-polyethylene (ir-LLDPE) composites were prepared by grafting nano SiO2-g-B onto ir-LLDPE by a melt reacting mixing process. The structure and properties of the materials were investigated by FTIR, SEM, DSC and accelerated migration testing, etc. The results indicate that the B is grafted onto the surface of nano SiO2. The melting temperature and the crystallization temperature of nano SiO2-g-B/ir-LLDPE composites decrease. Compared with ir-LLDPE, nano SiO2-g-B/ir-LLDPE composites have inconspicuous changes on mechanical properties. The effective wetting duration of nano SiO2-g-B/LLDPE composites films prepared by grafting B onto the surface of nano SiO2 is 25 days which is 6 days longer than that of common blending, and is 1.47 times longer than that of the film made by commercial dropping agents. 十三五国家重点研发计划项目（2016YFB0302401）；长春理工大学科技创新基金（XJJLG-2017-15）