聚硅氧烷改性双马来酰亚胺树脂的性能研究

Study on Properties of Polybismaleimide Resin Modified by Polysiloxane

先将双马来酰亚胺(BMI)和二氨基二苯砜(DDS)反应形成BMI/DDS体系,然后将3-氨基丙基三乙氧基硅烷(KH550)预聚体加至该体系中,得到有机硅改性树脂BMI/DDS/KH550。分别探究了DDS、KH550的用量对BMI/DDS及BMI/DDS/KH550体系韧性、耐热性能、耐水性能等的影响。研究表明:随着BMI和DDS物质量比(n_(BMI)/n_(DDS))的减小,即DDS含量的增加,BMI/DDS改性树脂的韧性提高,耐热性、吸水性下降。BMI/DDS/KH550改性树脂的力学性能随着KH550预聚体用量的增加呈先升后降的趋势。其中当KH550预聚体用量为8%时,BMI/DDS/KH550改性树脂的力学性能最优,其冲击强度和拉伸强度分别达到6.30 k J/m^2和6.80MPa;而当KH550预聚体用量为5%时,BMI/DDS/KH550体系的耐热性达到最佳,其起始分解温度(T_(5%))、耐热温度指数(TI)、最大分解温度(T_(max))分别达到390.98、219.98和478.84℃。此外,与BMI/DDS体系相比,BMI/DDS/KH550改性树脂的吸水性略有提高。

The bismaleimide/binary amine（BMI/DDS） system was formed by reacting BMI with DDS firstly, then adding prepolymer 3-triethoxysilylpropylamine（KH550） to the system, and the siliconemodified resin BMI/DDS/KH550 was obtained. The effects of DDS and KH550 on toughness, heat resistance and water resistance of BMI/DDS and BMI/DDS/KH550 systems were studied, respectively. The results show that： with the decreasing molar ratio of BMI/DDS（n_（BMI）/n_（DDS））, namely, the increase of DDS content, the toughness of BMI/DDS system is improved, the heat resistance and water absorption are decreased. Moreover, the mechanical properties of BMI/DDS/KH550 system increase first and then decrease with the increase of KH550 content. When the amount of KH550 prepolymer is 8%, the BMI/DDS/KH550 system has the best mechanical properties, the impact strength and the tensile strength can reach seperately to 6.30 k J/m～2 and 6.80 MPa; and when the amount of KH550 prepolymer is 5%, the BMI/DDS/KH550 system has the best heat resistance, the initial decomposition temperature（T_（5%））, heat-resistant temperature index（TI） and maximum decomposition temperature（T_（max）） can reach 390.98, 219.98 and 478.84℃, respectively. In addition, the water absorption of BMI/DDS/KH550 system increases slightly than that of BMI/DDS system.