CAJ | 학술논문

以同向啮合双螺杆挤出机为反应器,采用苯乙烯和异戊二烯为聚合单体,以正丁基锂为引发剂,采用三次加料法合成苯乙烯/异戊二烯/苯乙烯(SIS)三嵌段热塑性弹性体。氢核磁共振(1H NMR)谱分析结果表明,共聚物中聚异戊二烯嵌段以1,4-结构为主。采用四氧化锇催化双氧水氧化降解聚合物分子链,利用凝胶渗透色谱对氧化降解后的聚苯乙烯碎片进行分析,证明共聚物分子为(聚苯乙烯-聚异戊二烯-聚苯乙烯)( PS-PI-PS)三嵌段结构。动态力学分析( DMA)及透射电子显微镜( TEM)分析结果表明, SIS具有两相分离结构。拉伸试验结果表明,共聚物拉伸强度与苯乙烯含量有关。
이동향교합쌍라간제출궤위반응기,채용분을희화이무이희위취합단체,이정정기리위인발제,채용삼차가료법합성분을희/이무이희/분을희(SIS)삼감단열소성탄성체。경핵자공진(1H NMR)보분석결과표명,공취물중취이무이희감단이1,4-결구위주。채용사양화철최화쌍양수양화강해취합물분자련,이용응효삼투색보대양화강해후적취분을희쇄편진행분석,증명공취물분자위(취분을희-취이무이희-취분을희)( PS-PI-PS)삼감단결구。동태역학분석( DMA)급투사전자현미경( TEM)분석결과표명, SIS구유량상분리결구。랍신시험결과표명,공취물랍신강도여분을희함량유관。
Styrene/isoprene/styrene ( SIS ) triblock thermoplastic elastomer was polymerized by three times feeding method using a co-rotating intermeshing twin screw extruder as the reactor and n-butyllithium as the initiator. 1 H NMR spectra show that the polyisoprene block of the copolymer is mainly composed of 1,4-polyi-soprene structure. The molecule chains of the copolymers were degraded using hydrogen peroxide catalyzed by osmium tetroxide, the segments of polystyrene after oxidization were characterized by gel permeation chroma-tography( GPC) cooperating with the multi-angle laser light scattering( MALLS) instrument. It was found that the copolymers consisted of polystyrene-polyisoprene-polystyrene( PS-PI-PS) three blocks. Cooperated with the survey of dynamic mechanical analysis(DMA) and transmission electron microscope(TEM) photographs, it was confirmed that styrene/isoprene/styrene( SIS) had two phase separation structure. Tensile testing showed the relationship between tensile strength of the copolymer with styrene content.