磺化SBS离聚体与结晶聚烯烃的共混物

合成橡胶工业，2005-11-15, 28 (6): 472研究快讯CommunicationCHINA SYNTHETIC RUBBER INDUSTRYBlends of ionomers of sulfonated styrene-butadiene-styrenetriblock copolymer with crystalline polyolefinsLiu Dagang' , Xie Hongquan2 ,Ye Qiang'(1. Hubei Research Instiute of Chemistry; Wuhan 430074, China;2. Department of Chemistry , Huazhong University of Science and Technology, Wuhan 430074 , China;3. Synthetic Rubber Factory of Baling Petrochemical Company , Yueyang 414014 , China)Recently thermoplastic elastomers that contain ionic do-as physical crosslinks. At the interfaces the two physicalmains as physical crosslinks have become of greater interest.crosslinks penetrate into each other. This will enhance com-Beaides their attractive properties, they also produce some inpatibility of the two components, thus increasing the interfa-teresting blends with certain polymers. Fitzgerald et al1cial adhesion and the ability to transfer stress through thepointed out that rubbers with a high degree of unsaturation gelphases, resulting in synergism in strength. Thus the syner-easily during sulfonation. Later Xie et al 23 found that in thegism is due to the enhanced compatibility caused by the phy8-presence of ketone, styrene-butadiene rubber(SBR) can beical interpenetrating networks.sulfonated in petroleum ether without gel formation. Xie etalb) reported that the blends of sulfonated butyl rubber iono-Table 1 Mechanical properties of sulfonated SBSionomer* /PP ( HDPE) blends with different composltionsmer with erytalline polypropylene ( PP), high density poly-ethylene( HDPE ) exhibited synergistic behavior with respectMass fractionTensileElongation Permanentof PP (HDPE)/% strength/MPaat break/%sel/%to tensile strength.100( 100)37.2(29.2)14(46)4(4)Sulfonated SBS ionomer ws made through sulfonation ofSBS in cyclohexane containing a small amount of acetone75<75)33. 1(27.6)170( 126)12(12)using acetyl sulfate as the sulfonating agent made from sulfu-50(50)28. 9(24.1)235(208)16(20)25<25)24.2(19.6)370(342)20(16)ric acid and acetic anhydride. The sulfonation solution wasneutralized by adding sodium hydroxide in an ethyl alcohol /07.282524water mixture at a neutralization degree of 1.2 mole ratio of* Sulfonated SBS iononer with sulfoation degree of 0. 291 mmo/g.NaOH/SO,H with stiring at room temperature for 1 h. TheRefesolvent was removed by flashing in hot water and the ionomerFitzgerald J I, Weiss R A. Synthesis, propertiea and structure ofwas dried. The sodium sulfonated SBS ionomer was mixedsulfonated ionomers[1]. J Macromol Sci,1988 ,C 28(1 ,2): 99with 10% mass fraction of zinc stearate, 1% mass fraction ofXie Hongquan , Ao Zhiping, Guo Junshi. Melt flow and mechanicalantioxidant 264 and various proportions of HDPE or PP on aproperies of sulonated SBR ionomers and their polymer blendehot mill at 170 or 190 C for 15 min. and compression mold-J]. J Macromol Sci,1995, B 34(3); 249ed at the same temperature under 10 ~ 15 MPa.3 Xie Hongquan . Xu Jjigeng, Zhou Shibiao. Polymer blende with twoThe blending of PP or HDPE with the ionomer was carriedkinds of elastomerie ionomers[J]. Polymer, 1991 ,32(1): 95out in the presence of zinc stearate , since the latter can lowerthe melt viscosity and improve the mechanical properties of磺化SBS离聚体与结晶聚烯烃的共混物刘大刚'，the ionomer. Table 1 lists the mechanical properties of the谢洪泉”，叶强'(1. 湖北省化学研究院，湖北武汉sulfonated SBS ionomer/PP or HDPE blends with diferent430074;2.华中科技大学化学系,湖北武汉430074;compositions in the presence of 10 % zinc stearate, based on3.巴陵石化公司合成橡胶厂,湖南岳阳414014 )研究the ionomer. w ith increasing PP or HDPE the blend changes了磺化SBS离聚体与聚丙烯或高密度聚乙烯在质量分数its behavior from thermoplastic elastomer to toughened plas-为10%的硬脂酸锌存在下熔融共混得到的共混物的力学tic. When the tensile strength of the blend was plotted versus性能。结果表明,共混物的拉伸强度均呈协同效应,这是因为生成了热塑性互穿网络结构。随着聚烯烃含量的增mass fraction of PP or HDPE, a synergism was. observed ,i.e.，the tensile strength is higher than the calculated sum of加,共混物由热塑性橡胶变成增韧树脂。关键词:磺化苯tensile strength contributed by the two components， except乙烯- T.龉嵌段北嘉物;离聚体;聚丙烯;高the blend containing 25% mass fraction of HDPE. This may密度中国煤化工be atributed to the thermoplastic interpenetrating polymer:1HCNMHGnetwork (IPN) formed in the blend, because both the ionicReceived :2005 -05 -31.domains and the glassy domains in the SBS ionomer and alsoBiography :Liu Dagang, master.the eysalline regions of the PP or HDPE can be considered●To whom all crrespondence ahould be addressed.