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Jul 14, 2023
A series of homopolymerized and copolymerized polyimides were synthesized from BPDA, bis (3,4-disunaphenyl) dimethylsilanedianhydride (S-core A) and diphenyltyrenediamine (ODA), and their gas permeability was studied. The permeability coefficient of S-core A-ODA is about a few steps higher than that of BPDA-ODA, but the permeability selectivity is slightly lower. In order to balance breathability and selectivity, they synthesized a series of (BPDA SiDA) - ODA random copolymers. With the increase of SiDA content, the hydrogen and oxygen permeability coefficients both increase significantly, while the separation coefficients of H and 0 decrease.
Copolymer polyimides were prepared with 1,3-bis (3,4-disunionylphenyl) -1,1,3,3-tetramethyldisiloxane dianhydride (PADS) balanced with siloxane as the soft segment and [(l-methylethylidene) bis (1,4-phenyleneoxy)] bis 1,1,3-isobenzopyranedione CBPADA) as the hard segment under the action of para or M-Phenylenediamine. These copolymer polyimides contain different siloxane chain lengths and different total silicon content. Research has shown that there is a linear relationship between their elastic modulus, elongation at break, and cut through temperature, as well as the chain length and total silicon content of siloxanes, and these materials have good solubility in chloroform.
Polyimide synthesized from silicon containing dianhydride monomer. It may be that the diamine containing heteroatoms gives the polyimide more flexibility than the dianhydride containing heteroatoms. Therefore, there are few reports on the synthesis of polyimide with silicon containing dianhydride.
The main chain structure introduces other modified polyimide monomers containing two reactive active end groups and silicon, and other modified polyimide monomers containing two reactive active end groups and silicon. Copolymerized polyimide was prepared by the reaction of PMDA and CBTDA with organosilicon diisobenoate.
The results showed that the thermal stability of the polyimide was better when R was - c6 pressure, but it was insoluble in DMAc. Some studies also show that polyimide with R ratio of - C has better thermal stability in air than polyimide with R pressure of - c6; In nitrogen, the initial weight loss temperature of the former is higher, but the maximum weight loss temperature is slightly lower.
Other literatures reported the synthesis of silicon containing polyimides through Addition reaction. Although the thermal stability is reduced to a certain extent with the introduction of siloxane segments, polyimide polyheterosiloxane (CPI-PHSX) with better thermal stability is synthesized from polyheterosiloxane (PHSX) with better solvent resistance and thermal stability than polyorganosiloxane, and this material also has lower surface tension.
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