以4-溴苯并环丁烯（4-BrBCB）和烯丙基溴（ABr）为原料,利用Grignard反应一步法合成出4-烯丙基苯并环丁烯（4-ABCB）单体,并通过硅氢加成反应,成功地将硅氧烷引入到BCB单体中,合成出1,3-二（3-苯并环丁烯基丙基）-1,1,3,3-四甲基二硅氧烷（DPSBCB）单体。单体结构利用红外光谱（FT-IR）、核磁共振（1H-NMR、13C-NMR）等进行了表征和确认。DPSBCB单体在热引发条件下开环聚合得到具有一定交联度的可溶性预聚体。最后利用旋涂法制备出聚合物薄膜,分析了聚合物的成膜性能和热性能,结果显示,薄膜的均方根粗糙度（RMS）为0.79 nm,聚合物初始分解温度为445℃。说明DPSBCB聚合物具有良好的成膜性能和优异的热稳定性。
4-bromobenzocyclobutene and allyl bromide were employed to afford the monomer of 4-allylbenzocyclobutene by Grignard reaction in one-step.The siloxane was introduced into the monomer of BCB to preparation 1,3-bis（3-benzocyclobutenyl propyl）-1,1,3,3-tetramethyl disiloxane（DPSBCB） via hydrosilylation reaction.The structures of the monomers were characterized and confirmed by Fourier transform infrared spectrum（FT-IR）,nuclear magnetic resonance spectrum（1H-NMR and 13C-NMR）.The prepolymerization reaction of DPSBCB was carried out by thermal initiation to give the soluble prepolymer with some crosslink degree.The thermostability and film-forming property of the film prepared from the prepolymer by spin-coating method were analyzed by thermogravimetry and atomic force microscopy.The results show that the root-mean square（RMS） roughness is 0.79 nm,and the starting mass loss temperature is about 445 ℃.It indicate that DPSBCB exhibits good film-forming property and excellent thermal stability.
参考文献
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