环氧树脂/杂萘联苯聚芳醚共混物及复合材料
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摘要
环氧树脂综合性能优异且易加工成型,在高性能复合材料基体、胶粘剂、涂料、电子电气绝缘材料等领域已得到广泛应用,但其本征性脆的特点限制了其应用。本论文采用本课题组开发的含二氮杂萘酮结构的聚醚砜酮(PPESK)及共聚醚砜(PPBES)与环氧树脂共混,以期实现对其增韧。在此基础上,采用悬浮法浸渍连续玻璃纤维和碳纤维制备了共混物的单向复合材料,对其性能进行了研究,以便为将来的实际应用打下坚实基础。
采用PPESK或PPBES粉末/环氧树脂E-51/固化剂4,4'-二氨基二苯砜(DDS)丙酮溶液悬浮法分别制备了不同组分的PPESK/E-51/DDS和PPBES/E-51/DDS共混物,并对其结构和性能进行了研究。对通过示差扫描量热仪(DSC)研究了PPESK/E-51/DDS和PPBES/E-51/DDS两种共混固化产物的玻璃化转变温度(T_g),结果表明所有组分共混物均只检测到一个与纯环氧树脂相近的T_g,而扫描电子显微镜(SEM)观测发现共混物仅存在非常微细的相分离结构。加入PPESK和PPBES,改性环氧树脂体系浇铸体的冲击韧性及断裂韧性均有所提高,但与组分的关系不尽相同。其中PPESK/E-51/DDS的冲击强度和断裂韧性在PPESK含量为20phr时最高。而PPBES/E-51/DDS的冲击韧性在PPBES含量为10phr时最大,断裂韧性在20phr时最大。
在上述研究的基础上,采用悬浮预浸法分别制备了连续玻璃纤维和碳纤维增强PPESK/E-51/DDS和PPBES/E-51/DDS复合材料,并对复合材料的力学性能进行了研究。研究结果表明:悬浮状胶液的粘度随PPESK或PPBES含量的增加而增大,但可以通过丙酮的加入量来调节;复合材料的弯曲强度随PPESK或PPBES的加入稍有下降,层间剪切强度有所提高,而吸水性则变化不大。
Epoxy resins possess excellent comprehensive properties and processability,which makes them extensively applied as high performance composite matrix,coatings and adhesives.However,the characteristic brittle limits their applications.In this work,two novel high performance thermoplastics,poly(phthalazinone ether sulfone ketone)(PPESK) and poly(phthalazinone biphenylene ether sulfone)(PPBES),were used to toughen epoxy resin by blending.And continuous S-glass fiber and T700 carbon fiber reinforced unidirectional composites of two blends were prepared.The structures and properties of blends and their composites were studied for their application consideration.
PPESK or PPBES powders were used to prepare the above mentioned toughening blends. The two blends with different compositions,PPESK/epoxy resin E-51/4,4'-diamino diphenyl sulfone(DDS)and PPBES/E-51/DDS,were prepared by PPESK or PPBES powder suspending in E-51/DDS acetone solvent.Differential scanning calorimetry(DSC)and Scanning electron microscope(SEM)were used to investigate the structures of the blends. The results indicate that the blends show slight phase separated structures and only a glass transition temperature similar to pure E-51/DDS is determined.The impact strength and fracture toughness(K_(IC))of two blends were also studied,which show different tendency with the introduction of the two thermoplastics.For PPESK/E-51/DDS blends,impact strength and K_(IC)go to the maximum as PPESK content increases to 20phr.For PPBES/E-51/DDS blends, impact strength goes to the maximum as PPBES content is 10phr,and K_(IC)goes to the maximum at PPBES content of 20phr.
On the basis of these studies,the continuous S-glass fiber and T700 carbon fiber reinforced unidirectional composites of two blends were prepared by PPESK or PPBES powders/E-51-DDS/acetone suspending solvent impregnating methods.The mechanical properties of two composites were investigated.The results indicate that viscosities of suspending solvent increase with the increase of PPESK or PPBES contents,and with the introduction of PPESK or PPBES,flexural strengths of the composites show a slightly decrease and interlaminar shear strength increase and water absorptions change a little.
采用PPESK或PPBES粉末/环氧树脂E-51/固化剂4,4'-二氨基二苯砜(DDS)丙酮溶液悬浮法分别制备了不同组分的PPESK/E-51/DDS和PPBES/E-51/DDS共混物,并对其结构和性能进行了研究。对通过示差扫描量热仪(DSC)研究了PPESK/E-51/DDS和PPBES/E-51/DDS两种共混固化产物的玻璃化转变温度(T_g),结果表明所有组分共混物均只检测到一个与纯环氧树脂相近的T_g,而扫描电子显微镜(SEM)观测发现共混物仅存在非常微细的相分离结构。加入PPESK和PPBES,改性环氧树脂体系浇铸体的冲击韧性及断裂韧性均有所提高,但与组分的关系不尽相同。其中PPESK/E-51/DDS的冲击强度和断裂韧性在PPESK含量为20phr时最高。而PPBES/E-51/DDS的冲击韧性在PPBES含量为10phr时最大,断裂韧性在20phr时最大。
在上述研究的基础上,采用悬浮预浸法分别制备了连续玻璃纤维和碳纤维增强PPESK/E-51/DDS和PPBES/E-51/DDS复合材料,并对复合材料的力学性能进行了研究。研究结果表明:悬浮状胶液的粘度随PPESK或PPBES含量的增加而增大,但可以通过丙酮的加入量来调节;复合材料的弯曲强度随PPESK或PPBES的加入稍有下降,层间剪切强度有所提高,而吸水性则变化不大。
Epoxy resins possess excellent comprehensive properties and processability,which makes them extensively applied as high performance composite matrix,coatings and adhesives.However,the characteristic brittle limits their applications.In this work,two novel high performance thermoplastics,poly(phthalazinone ether sulfone ketone)(PPESK) and poly(phthalazinone biphenylene ether sulfone)(PPBES),were used to toughen epoxy resin by blending.And continuous S-glass fiber and T700 carbon fiber reinforced unidirectional composites of two blends were prepared.The structures and properties of blends and their composites were studied for their application consideration.
PPESK or PPBES powders were used to prepare the above mentioned toughening blends. The two blends with different compositions,PPESK/epoxy resin E-51/4,4'-diamino diphenyl sulfone(DDS)and PPBES/E-51/DDS,were prepared by PPESK or PPBES powder suspending in E-51/DDS acetone solvent.Differential scanning calorimetry(DSC)and Scanning electron microscope(SEM)were used to investigate the structures of the blends. The results indicate that the blends show slight phase separated structures and only a glass transition temperature similar to pure E-51/DDS is determined.The impact strength and fracture toughness(K_(IC))of two blends were also studied,which show different tendency with the introduction of the two thermoplastics.For PPESK/E-51/DDS blends,impact strength and K_(IC)go to the maximum as PPESK content increases to 20phr.For PPBES/E-51/DDS blends, impact strength goes to the maximum as PPBES content is 10phr,and K_(IC)goes to the maximum at PPBES content of 20phr.
On the basis of these studies,the continuous S-glass fiber and T700 carbon fiber reinforced unidirectional composites of two blends were prepared by PPESK or PPBES powders/E-51-DDS/acetone suspending solvent impregnating methods.The mechanical properties of two composites were investigated.The results indicate that viscosities of suspending solvent increase with the increase of PPESK or PPBES contents,and with the introduction of PPESK or PPBES,flexural strengths of the composites show a slightly decrease and interlaminar shear strength increase and water absorptions change a little.
引文
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