摘要
采用热失重分析、凝胶含量和力学性能的测定、动态流变等方法研究了不同增容工艺对聚苯乙烯(PS)/乙丙三元橡胶(EPDM)大分子间Friede-l Crafts烷基化反应的影响。结果表明,与直接增容共混物相比,预混增容共混物中含有较多的接枝共聚物和较低的凝胶含量,其力学性能得到提高,拉伸强度从18.3MPa提高至20.3MPa,断裂伸长率从5.6%提高至21.6%;热重分析显示,其最大分解速率温度提高10℃;动态流变行为显示,在低频率(ω)区域,预混增容共混物的储能模量(G′)、损耗模量(G″)、复数黏度(η*)低于直接增容共混物,损耗正切(tanδ)高于直接增容共混物;扫描电镜(SEM)照片显示,其分散相均匀细小,韧性断裂特征明显。
Using thermal gravimetric analysis, determination of gel content and mechanical properties, dynamic rheology and other methods, effects of in-situ compatibilization technique on Friedel-Crafts alky/ation reaction between poly （ethylene-propylene-diene monomer） （EPDM） and polystyrene （PS） were investigated. The results show that the blends compatibilized by pre-mixed technique contain more EPDM-g-PS copolymer and less gel content compared to blends compatibilized by direct technique, and then the mechanical properties are improved for example, the tensile strength increases from 18.3 MPa to 20.3 MPa and elongation at break increases from 5.6 % m 21.6 %. the temperature of the maximum degradation rate of the pre-mixed technique compatibilized blends rises about 10 ℃. The dynamic rheological properties show that at the low frequency （ω） range, the dynamic storage modulus （ G＇ ）, loss modulus （G＂） and complex viscosity （ η＊ ） of the blends by direct compatibilization technique are higher than of the mechanical blends, while the loss tangent （tanδ） is lower. SEM photographs show that the dispersed phase of the pre-mixed technique compatibilized blends is more homogeneous and smaller and shows significant ductile fracture characteristics.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第2期78-81,共4页
Polymer Materials Science & Engineering
基金
江苏省自然科学基金资助项目(BK2003028)
