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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。
Bismaleimide (BMI) and diaminodiphenyl sulfone (DDS) were first reacted to form a BMI / DDS system and then 3-aminopropyltriethoxysilane (KH550) prepolymer was added to the system , To obtain a silicone modified resin BMI / DDS / KH550. The effects of DDS and KH550 dosage on the toughness, heat resistance and water resistance of BMI / DDS and BMI / DDS / KH550 systems were investigated. The results show that the toughness of BMI / DDS modified resin increases with the decrease of BMI / DDS ratio (DDS), ie, the content of DDS. The heat resistance and water absorption of BMI / DDS modified resin decrease. The mechanical properties of BMI / DDS / KH550 modified resin tend to increase first and then decrease with the increase of KH550 prepolymer. The mechanical properties of BMI / DDS / KH550 modified resin were the best when the amount of KH550 prepolymer was 8%, the impact strength and tensile strength reached 6.30 kJ / m ~ 2 and 6.80MPa, respectively. When KH550 pre-polymer The heat resistance of BMI / DDS / KH550 system was best when the amount of polymer was 5%. The initial decomposition temperature (T_ (5%)), heat resistance temperature index (TI) and maximum decomposition temperature (T_ (max) )) Reached 390.98, 219.98 and 478.84 ° C, respectively. In addition, the BMI / DDS / KH550 modified resin showed slightly better water uptake than the BMI / DDS system.