聚硼硅氧烷的合成及其流变性能  

Synthesis and rheological property of polyborosiloxanes

作　　者：刘晨阳 李峰[1,2] 翟哲 李慧[1] LIU Chenyang;LI Feng;ZHAI Zhe;LI Hui(School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;Xi'an Peak Xuankai New Material Co.,Ltd.,Xi'an 710024,China)

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]西安匹克玄铠新材料有限公司,西安710024

出　　处：《材料工程》2022年第6期164-169,共6页Journal of Materials Engineering

摘　　要：为了探究聚硼硅氧烷(PBDMSs)的物理交联网络结构对体系黏弹性的影响,将不同羟基含量的端羟基聚二甲基硅氧烷(PDMS)分别与硼酸进行反应,制备不同硼化交联密度的PBDMSs,并对合成的PBDMSs的结构、热力学及流变性能进行表征。结果表明:制备的PBDMSs中含有Si—O—Si,Si—O—B,CH_(3)—Si—CH_(3)和B—O—B结构单元;PBDMSs具有优异的耐低温性能,其玻璃化转变温度随着原料PDMS中羟基含量的增加而升高,且当原料PDMS的羟基含量较低时(1%和2%,质量分数),生成物PBDMSs具有一定的结晶能力;PBDMSs具有频率敏感性的特征,并且具有良好的抗冲击能力、优异的阻尼耗散能力和出色的回弹性能,原料PDMS的羟基含量影响生成物PBDMSs的物理交联网络结构,进而对PBDMSs的动态模量有显著影响,实际应用时可根据需求改变PDMS的羟基含量来调节PBDMSs的黏弹性。In order to explore the influence of the physical crosslinking network structure of polyborosiloxanes(PBDMSs)on the viscoelasticity of the system,hydroxyl terminated polydimethylsiloxane(PDMS)with different hydroxyl contents were reacted with boric acid to prepare PBDMSs with different boronization crosslinking densities.Thereafter the structure,thermodynamics and rheological properties of the as prepared samples were characterized.The results show that PBDMSs contain Si—O—Si,Si—O—B,CH_(3)—Si—CH_(3) and B—O—B structural units.And PBDMSs have excellent low temperature resistance,while their glass transition temperature increases with the increase of hydroxyl content in PDMS.And at low hydroxyl content of PDMS(1%and 2%,mass fraction),crystallization of PBDMSs are observed.Moreover,PBDMSs possess the characteristics of frequency sensitivity,good impact resistance,excellent damping dissipation and excellent resilience.The hydroxyl content of PDMS obviously affects the physical crosslinking network structure of PBDMSs,and thus has a significant impact on the dynamic modulus of PBDMSs.In practical application,the viscoelasticity of PBDMSs can be adjusted by changing the hydroxyl content of PDMS.

关 键 词：端羟基聚二甲基硅氧烷 玻璃化转变温度 黏弹性 抗冲击性能 

分 类 号：O63[理学—高分子化学]