A series of organosoluble and colorless poly amide imide)s with inherent viscosities ranging from 0.95 to 1.70 dl/g were synthesized from diimide diacid I and various aromatic diamines by the direct polycondensation using triphenyl phosphite and pyridine as condensing agents.
An inherently flame-retardant poly(lactic acid) (PLA) was synthesized via the chain-extending reactions of dihydroxyl terminated pre-poly(lactic acid) (pre-PLA), which was synthesized by direct polycondensation of l-lactic acid using 1,4-butanediol as initiator and stannous chloride (SnCl2) as catalyst, using ethyl phosphorodichloridate as chain extender.
A series of aromatic polyamides having inherent viscosities of 1.03 1.48 dl g−1 were prepared by direct polycondensation with aromatic dicarboxylic acids using triphenyl phosphite and pyridine as condensing agents.
A series of aromatic poly(1,3,4-oxadiazole)s, PODZs, was prepared either by direct polycondensation of dicarboxylic acids with hydrazine sulfate using the polyphosphoric acid/methanesulfonic acid mixture, or by thermal cyclodehydration of the corresponding poly(hydrazide)s.
The polymer was conveniently prepared by direct polycondensation of an AB2 monomer, 3,5-diphenoxybenzoic acid, using phosphorus pentoxide/methanesulfonic acid (PPMA) as the condensing agent and solvent.
Based on the diamine, a series of organosoluble polyamides were prepared by direct polycondensation of the diamine with various aromatic diacids using triphenyl phosphite and pyridine as condensing agents.
Polyamides (4a g) having inherent viscosities of 0.94 – 2.08 dl g−1 were prepared by direct polycondensation of the diamine 2 with various aromatic diacids using triphenyl phosphite and pyridine as condensing agents.
High molecular weight aromatic polyamides were obtained from 4,4′-bis[ 3-carboxyphenoxy)(p-benzoyl)]phenyl sulfone, by direct polycondensation reaction in N-methyl-2-pyrrolidone with various aromatic diamines, using triphenyl phosphite and pyridine as condensing agents.
A series of new adamantyl-containing polyamide-imides (PAIs) were prepared by direct polycondensation of ADBTB and various aromatic diamines in N-methyl-2-pyrrolidinone (NMP) using triphenyl phosphite and pyridine as condensing agents.
A new diamine monomer containing noncoplanar methyl substitution, 2,2′-dimethyl-4,4′-bis 2-trifluoromethyl-4-aminophenoxy biphenyl (DBTFAPB) was successfully synthesized and used in the preparation of a series of polyamides and polyimides by direct polycondensation with various aromatic dicarboxylic acids and tertacarboxylic dianhydrides.
