纳米级无机粒子对聚乙烯的增强与增韧

The Reinforcing and Toughening of PE by nano Inorganic Particles

对μｍ级ＣａＣＯ３、ＴｉＯ２和ｎｍ级ＳｉＣ／Ｓｉ３Ｎ４粒子填充ＬＤＰＥ的性能进行了研究。实验证明，μｍ级粒子对ＬＤＰＥ虽无明显的增强增韧作用，但也未使基体的机械性能大幅度下降。ｎｍ级ＳｉＣ／Ｓｉ３Ｎ４对ＬＤＰＥ有较大的增强增韧作用，在５％质量分数时冲击强度出现最大值，缺口冲击强度达５５．７ｋＪ／ｍ２为纯ＬＤＰＥ的２０３％；伸长率到６２５％时仍未断裂，为纯ＬＤＰＥ的５００％，但熔体流动速率急剧下降，仅为纯ＬＤＰＥ的２６％，当含量在３％和１５％质量分数时，熔体流动速率分别为纯ＬＤＰＥ的３３７％和１５１％。

Studies of the properties of LDPE filled with micro CaCO 3,TiO 2 and nano SiClSi 3N 4 respectively were made The results showed though micro particles had no obvious reinforcing effect on LDPE,it did not cause the mechanical properties of LDPE to decrease greatly nano SiClSi 3N 4 had better toughening effect on LDPE;when the particle content was 5% (by mass),the LDPE had maximum impact strength,with a notched impact strength of 5 5kJ/m 2,being 203% of that of pure LDPE,and did not fracture when the elongation was up to 625%,being 500% of that of pure LDPE,but the melt flow ratio(MFR) of the LDPE decreased greatly,being 26% of that of pure LDPE When the particle content was 3% and 15% (by mass)respectively,the MFR of the LDPE was 337% and 151% of that of pure LDPE respectively