In this study, rigid 4,4＇-diglycidyl（3,3＇,5,5＇-tetramethylbiphenyl） epoxy（TMBP）-based composites were developed by the incorporation of varying percentages of commercial hollow glass microspheres（HGMs, QH-450...In this study, rigid 4,4＇-diglycidyl（3,3＇,5,5＇-tetramethylbiphenyl） epoxy（TMBP）-based composites were developed by the incorporation of varying percentages of commercial hollow glass microspheres（HGMs, QH-450） into the TMBP resin used for electronic packaging. The thermal and mechanical properties as well as the morphology of all the composites were characterized, and dielectric properties were characterized by advanced analytical techniques. The results reveal that a series of TMBP/QH-450 composites exhibits higher initial degradation tempera- tures（Td, s,/o〉300 ~C）, and the residual char and glass transition temperature were clearly improved with QH-450 loading. In addition, all epoxy composites exhibited a lower dielectric constant ranging from 3.74 to 3.06 at 1.2 MHz because the lower dielectric properties of the inert gas used as the core of the QH-450 decreased molecule polarity. Hence, this developed TMBP/QH450 system demonstrates potential applications in electronic packaging.展开更多
A series of comb-shaped poly(arylene ether sulfone)s containing pendant 2-methyl-3-alkylimidazolitun group(ImPAES-Cx,x=1,6,10)was prepared and characterized as novel anion exchange membranes.These Im-PAES-Cx membranes...A series of comb-shaped poly(arylene ether sulfone)s containing pendant 2-methyl-3-alkylimidazolitun group(ImPAES-Cx,x=1,6,10)was prepared and characterized as novel anion exchange membranes.These Im-PAES-Cx membranes were obtained by benzylic bromination and imidazolium functionalization.The characteristic nano-phase separation structure was formed in membranes with longer alkyl side chains,as confmned by small-angle X-ray scattering.The nano-phase separation structures endowed ImPAES-Cx membranes with improved ionic conductivity,dimensional stability(at least 60% decrease water uptake and swelling ratio at 60℃)and mechanical properties,together with excellent alkaline stability.Especially,ImPAES-C6 membranes possessed enhanced hydroxide conductivity and chemical stability simultaneously.These results suggest that it is a feasible strategy to introduce appropriate length of alkyl side chains into anion exchange membranes(AEMs)to improve the performance.展开更多
基金Supported by the National Natural Science Foundation of China（No.21474036）.
文摘In this study, rigid 4,4＇-diglycidyl（3,3＇,5,5＇-tetramethylbiphenyl） epoxy（TMBP）-based composites were developed by the incorporation of varying percentages of commercial hollow glass microspheres（HGMs, QH-450） into the TMBP resin used for electronic packaging. The thermal and mechanical properties as well as the morphology of all the composites were characterized, and dielectric properties were characterized by advanced analytical techniques. The results reveal that a series of TMBP/QH-450 composites exhibits higher initial degradation tempera- tures（Td, s,/o〉300 ~C）, and the residual char and glass transition temperature were clearly improved with QH-450 loading. In addition, all epoxy composites exhibited a lower dielectric constant ranging from 3.74 to 3.06 at 1.2 MHz because the lower dielectric properties of the inert gas used as the core of the QH-450 decreased molecule polarity. Hence, this developed TMBP/QH450 system demonstrates potential applications in electronic packaging.
基金the National Natural Science Foundation of China(No.21474036).
文摘A series of comb-shaped poly(arylene ether sulfone)s containing pendant 2-methyl-3-alkylimidazolitun group(ImPAES-Cx,x=1,6,10)was prepared and characterized as novel anion exchange membranes.These Im-PAES-Cx membranes were obtained by benzylic bromination and imidazolium functionalization.The characteristic nano-phase separation structure was formed in membranes with longer alkyl side chains,as confmned by small-angle X-ray scattering.The nano-phase separation structures endowed ImPAES-Cx membranes with improved ionic conductivity,dimensional stability(at least 60% decrease water uptake and swelling ratio at 60℃)and mechanical properties,together with excellent alkaline stability.Especially,ImPAES-C6 membranes possessed enhanced hydroxide conductivity and chemical stability simultaneously.These results suggest that it is a feasible strategy to introduce appropriate length of alkyl side chains into anion exchange membranes(AEMs)to improve the performance.
