《Low-temperature-curable and positive-type photosensitive polyimide with high mechanical strength, high resolution and good pot-life based on chain extendable poly(amic acid), thermal degradable crosslinker, chain extender, thermal base generator and photoacid generator》 was written by Yeh, Yao-Ming; Karapala, Vamsi Krishna; Ueda, Mitsuru; Hsu, Chain-Shu. Application In Synthesis of tert-Butyl carbamate And the article was included in Journal of Photopolymer Science and Technology in 2020. The article conveys some information:
A pos.-type photosensitive polyimide (PSPI) based on a chain extendable poly(amic acid) (PAA), a thermally degradable cross-linker 1,3,5-tris[(2-vinyloxy)ethoxy]benzene (TVEB), a photoacid generator (PAG) (5-propylsulfonyloxyimino-5H-thiophene-2-ylidene)-(2-methylphenyl)acetonitrile, a chain extender di-Ph isophthalate (DPI) and a thermal base generator (TBG) t-Bu 2,6-dimethylpiperidine-carboxylate has been developed. The PAA prepared from 3,3′,4,4′-biphenyltetracarboxylic dianhydride and 4,4′-oxydianiline was end-capped with di-tert-Bu dicarbonate, and undergoes a chain extending reaction during a curing stage to constitute a linear structure. This advancing PSPI exhibited high resolution of 3μm, good mech. properties, low residue content of cross-linker, low imidization temperature (250°C) catalyzed by TBG, preventing corrosion of Cu circuits due to neutralization of photogenerated acids with bases from TBG and the extended pot-life by using the chain extender with high hydrolytic stability, inducing a wide-ranging applicability. The results came from multiple reactions, including the reaction of tert-Butyl carbamate(cas: 4248-19-5Application In Synthesis of tert-Butyl carbamate)
tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. Left-handed and right-handed forms (mirror-image configurations, known as optical isomers or enantiomers) are possible when all the substituents on the central nitrogen atom are different (i.e., the nitrogen is chiral). With amines, there is extremely rapid inversion in which the two configurations are interconverted.Application In Synthesis of tert-Butyl carbamate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics