摘要
本文在介绍交联聚丙烯基本原理和工艺的基础上,讨论了以氢氧化铝作为脱水物质,使硅烷交联反应在室温条件下自发进行,硅烷交联聚丙烯所需的水分在聚合物内部解决,省去PP常规交联时的热水交联过程。研究了自交联聚丙烯凝胶率及机械性能随交联时间的变化规律。硅烷接枝PP试样在室温下脱水发生自交联反应,交联PP凝胶含量在室温条件下随时间的变化逐渐升高,在室温下放置40天左右后,凝胶含量基本保持稳定;当Al(OH)3含量逐渐增大时,凝胶含量变得更大,当Al(OH)3含量增大到2%以上时,制品表面出现大量气泡;随时间的变化,交联PP体系的机械性能变得更优异,Al(OH)3含量为1%的新生态PP在室温下放置40天左右后,拉伸强度和断裂伸长率基本保持稳定。
The mechanism and process of silane erosslinking polypropylene were discussed in this paper, meanwhile, the paper presented a way to use an additive Al（OH）3 which releases water at high temperature before extrusion so that the erosslinking in the presence of moisture results from the internal development of water. The step of immersing the product in water can be removed entirely. Self-crosslinking is happening in room temperature. The gel content and mechanical properties of self-crosslinked PP with time are discussed in this paper. The gel content of self-erosslinked PP increases with varying crosslinking time and Al（OH）3content, after crosslinking in room temperature for 40 days, the gel content of self-crosslinked PP becomes stable. While AI（OH）3 content was increased to 2%, bubbles comes out to the PP surface. The mechanical properties of self-crosslinked PP turn out to be excellent with varying time. After the grafted-PP with 1 % Al（OH）3 content crosslinking for 40 days, the tensile strength and elongation remain stable.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2008年第6期914-917,899,共5页
Journal of Materials Science and Engineering
关键词
聚丙烯
硅烷
接枝
自交联
氢氧化铝
silane
polypropylene
grafting
self-crosslinking
