合成橡胶工业
閤成橡膠工業
합성상효공업
CHINA SYNTHETIC RUBBER INDUSTRY
2014年
4期
263-268
,共6页
嵌段共聚聚丙烯%三元乙丙橡胶%力学性能%压缩永久变形%Mullins效应%微观形态
嵌段共聚聚丙烯%三元乙丙橡膠%力學性能%壓縮永久變形%Mullins效應%微觀形態
감단공취취병희%삼원을병상효%역학성능%압축영구변형%Mullins효응%미관형태
poly ( propylene-block-ethylene ) co-polymer%ethylene propylene diene monomer%me-chanical property%compression set%Mullins effect%micromorphology
采用动态硫化法制备了嵌段共聚聚丙烯（PP-b-PE）/三元乙丙橡胶（EPDM）热塑性硫化胶（ TPV），研究了其力学性能、压缩永久变形的可逆回复、Mullins效应及微观形态。结果表明，当PP-b-PE/EPDM质量比为30/70时TPV的综合性能较好；室温条件下压缩永久变形的可逆回复随TPV中橡胶相含量的升高而明显加快，且残余形变较小；提高温度可加速TPV永久变形的可逆回复，且高橡胶含量者的形变完全可逆。 PP-b-PE/EPDM TPV的单轴循环拉伸中存在明显的Mullins效应，在同一拉伸比下，内耗和阻尼因子在第1次加载-卸载循环中即达到最大值，第2次循环拉伸时明显下降，但之后下降趋势减缓，应力最大值则呈现缓慢下降的趋势。提高树脂用量，动态硫化产物的最大应力、残余形变、内耗、应力软化因子和阻尼因子均明显升高。拉伸断面的场发射扫描电镜观察结果表明，橡胶相含量的提高赋予了TPV强的弹性回复能力。
採用動態硫化法製備瞭嵌段共聚聚丙烯（PP-b-PE）/三元乙丙橡膠（EPDM）熱塑性硫化膠（ TPV），研究瞭其力學性能、壓縮永久變形的可逆迴複、Mullins效應及微觀形態。結果錶明，噹PP-b-PE/EPDM質量比為30/70時TPV的綜閤性能較好；室溫條件下壓縮永久變形的可逆迴複隨TPV中橡膠相含量的升高而明顯加快，且殘餘形變較小；提高溫度可加速TPV永久變形的可逆迴複，且高橡膠含量者的形變完全可逆。 PP-b-PE/EPDM TPV的單軸循環拉伸中存在明顯的Mullins效應，在同一拉伸比下，內耗和阻尼因子在第1次加載-卸載循環中即達到最大值，第2次循環拉伸時明顯下降，但之後下降趨勢減緩，應力最大值則呈現緩慢下降的趨勢。提高樹脂用量，動態硫化產物的最大應力、殘餘形變、內耗、應力軟化因子和阻尼因子均明顯升高。拉伸斷麵的場髮射掃描電鏡觀察結果錶明，橡膠相含量的提高賦予瞭TPV彊的彈性迴複能力。
채용동태류화법제비료감단공취취병희（PP-b-PE）/삼원을병상효（EPDM）열소성류화효（ TPV），연구료기역학성능、압축영구변형적가역회복、Mullins효응급미관형태。결과표명，당PP-b-PE/EPDM질량비위30/70시TPV적종합성능교호；실온조건하압축영구변형적가역회복수TPV중상효상함량적승고이명현가쾌，차잔여형변교소；제고온도가가속TPV영구변형적가역회복，차고상효함량자적형변완전가역。 PP-b-PE/EPDM TPV적단축순배랍신중존재명현적Mullins효응，재동일랍신비하，내모화조니인자재제1차가재-사재순배중즉체도최대치，제2차순배랍신시명현하강，단지후하강추세감완，응력최대치칙정현완만하강적추세。제고수지용량，동태류화산물적최대응력、잔여형변、내모、응력연화인자화조니인자균명현승고。랍신단면적장발사소묘전경관찰결과표명，상효상함량적제고부여료TPV강적탄성회복능력。
Poly ( propylene-block-ethylene ) copol-ymer(PP-b-PE)/ethylene propylene diene monomer ( EPDM ) thermoplastic vulcanizates ( TPV ) were prepared by dynamic vulcanization , and the me-chanical properties , reversible recovery of compres-sion set , Mullins effect and micromorphology of the prepared TPV were investigated systematically.The results showed that the TPV had good properties when PP-b-PE/EPDM ( mass ratio ) was 30/70.At room temperature , with increasing EPDM content in TPV, the reversible recovery of compression set was accelerated , and the residual deformation was de-creased; with increasing temperature , the recovery of compression set was sped up significantly , and the residual compression set of TPV with high EPDM content tended to zero.There was an obvious Mull-ins effect in the uniaxial cyclic stretch of TPV.At the same stretch ratio , the internal friction and loss factor went up to the maximum during the first load-ing-unloading cycle and decreased evidently during the second cycle but slightly afterwards , further-more, the maximum stress exhibited a slow down-trend during the stretch cycles.With increasing res-in content in TPV, the maximum stress, residual de-formation , internal friction , degree of stress soften-ing effect and loss factor increased obviously.The observation results of TPV fracture surface by field emission scanning electron microscope indicated that the increase of rubber phase in matrix enhanced the elasticity of TPV.
