Structure property relationships of polyimide membranes with low thermal expansion coefficient
It's of great significance to fine tuning the thermal expansion coefficient(CTE)of polyimide membranes due to its wide applications in chip manufacture,integrated circulate encapsulation,and organic light emitting devices.Here,we summarized the recently reported literatures for regulating the CTE of polyimide membranes from molecular level and condensation states.By starting from the principle of CTE,we focus on the main chain structures,chain connecting sequence,substitutions,copolymerization,intra-and inter-molecular interactions,crosslinking that change the polyimide chain from the molecular structures to their CTE values.At the same time,we also summarized the doping,blending,alignment,membrane formation process and imidization methods that can tune their CTE from the condensation states.At last,we summarized the future directions for low CTE polyimide membranes and their plausible regulating methods.
NETL
NSTL
万方数据
