摘要
采用ＥＳＣＡ，Ｍｏｌａｕ实验，ＳＥＭ，ＤＳＣ，ＤＭＡ，抽滤分析，ＦＴ－ＩＲ和拉伸应力－应变曲线，研究了紫外线辐照ＨＤＰＥ／ＰＡ６共混物的界面相互作用机理。结果表明，紫外线辐照下，ＨＤＰＥ分子链上引入Ｃ＝Ｏ，ＣＯＯＨ，－ＯＨ，－ＯＯＨ，－Ｃ－Ｏ－等极性基团；在与ＰＡ６熔融共混过程中，引入的Ｃ＝Ｏ，ＣＯＯＨ等基团与ＰＡ６分子链上的酰胺基或端胺基发生化学反应，生成ＨＤＰＥ－ＰＡ６共聚物。共聚物的形成增强了ＨＤＰＥ与ＰＡ６界面的相互作用。随辐照时间的延长，共混物不溶于二甲苯和甲酸的部分增加，溶解度降低，共混物的二甲苯高温溶液稳定，为均匀的白色乳液，无ＰＡ６粒子沉淀。与未辐照ＨＤＰＥ／ＰＡ６共混物相比，辐照ＨＤＰＥ共混物的拉伸强度，弹性模量，断裂伸长率和冲击强度明显得到提高。
The mechanism of interfacial interaction of ultraviolet irradiated high density polyethylene/polyamide 6(uHDPE/PA6) blend was studied through the ESCA, SEM, Molau test, DSC, DMA and FT IR. The results show that carboxyl, hydroxyl and hydroperoxide groups etc. are introduced to HDPE molecular chain after irradiation. During melt blending with PA6, the chemical reaction between carbonyl groups in irradiated HDPE and amino groups in PA6 is occured, the HDPE PA6 copolymer formed ameliorates interface bonding between HDPE and PA6, the solubility of the blend in both xylene and formic acid is obviously decreased. In Molau test, a persistent turbidity of hot xylene solution of the blend comes into view, no deposite of PA6 is observed. In DSC analysis, both HDPE and PA6 show the expected melting peaks of crystallization at 127.6 ℃ and 221.0 ℃ respectively, the position of melting peaks of PA6 in blend shifts to low temperature side, the particle size of PA6 in the blend is reduced and PA6 phase becomes indistinct. The tensile and impact strength, Young′s modulus and elongation at break of the irradiated blend are enhanced quite a lot as compared with those of HDPE/PA6.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1997年第1期38-42,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金
福特中国研究与发展基金
关键词
紫外线辐照
共混物
界面
结构
ultraviolet irradiation, HDPE/PA6 blend, interfacial interaction
