A Facile Strategy for Intrinsic Low-Dk and Low-Df Polyimides Enabled by Spirobifluorene Groups  

作　　者：Wan-Yi Tan Ling-Feng Jian Wei-Peng Chen Yong-Wen Zhang Xiao-Chuang Lu Wan-Jun Huang Ji-Sheng Zhang Jing-Wu Wu Jun-Li Feng Yi-Dong Liu Ting-Ting Cui Yong-Gang Min 

机构地区：[1]Guangdong University of Technology(GDUT),Guangzhou,510006,China [2]Huimai Materials Technology(Guangdong)Co.,Ltd.,Foshan,528200,China [3]Shenzhen Customs Industrial Product Inspection Technology Center,Shenzhen,518026,China

出　　处：《Chinese Journal of Polymer Science》2023年第2期288-296,共9页高分子科学（英文版）

基　　金：Key-Area Research and Development Program of Guangdong Province(No.2020B010182001);the National Natural Science Foundation of China(Nos.U20A20340 and 52001068);National Key R&D Program of China(No.2020YFB0408100);Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06C412);the“One-Hundred Young Talents”of Guangdong University of Technology(No.220413236);Foshan Introducing Innovative and Entrepreneurial Teams(No.1920001000108)。

摘　　要：Modified polyimides(MPIs)show great potential towards 5G communication applications,due to its excellent thermal stability,mechanical property and chemical stability as compared to most of polymers.Introducing fluoride groups or porous structure is favorable to ultra-low dielectric constant(D_(k))and dielectric loss(D_(f)).However,the cost of the fluorinated MPIs is high and their synthetic processes are complicated,and porous MPIs suffer poor mechanical properties.Also,increasing the fraction of free volume is a very effective way to lower D_(k)through introducing more ultra-low-D_(k)air component.However,most of this kind of MPIs lag far behind the fluorinated MPIs and the porous MPIs in terms of ultra-low D_(f),hindering the application of MPIs in high-speed communication devices.Thus,it is highly desirable to develop intrinsic ultra-low-D_(k)/D_(f)MPIs at high frequency with less fluoric groups and nonporous structure.Herein,we introduce a facile and effective strategy to lower D_(k)and D_(f)through introducing rigid and large sterically hindered aromatic groups into MPIs.On the one hand,their large steric hindrance effect leads to low D_(k)by increasing intrinsic free volume.On the other hand,the resulting highly stiff polymer chain and strong intermolecular interaction are favorable to reduce D_(f)by inhibiting dipole orientations.Based on this strategy,the spirobifluorene groups are preferred.The as-prepared MPIs show excellent dielectric performance with low D_(k)of 2.74–2.76 and low D_(f)of 0.00599 at 10 GHz,to some extent,exceeding the multiple fluorinated MPI with D_(k)/D_(f)of 2.67/0.00663 at 10 GHz.

关 键 词：POLYIMIDE High speed communication Low dielectric constant Low dielectric loss 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]