Studies on thermotropic liquid crystalline polymers. XIV. Synthesis and properties of liquid crystalline poly(imide-ester)s by the direct polycondensation

Research progress in the preparation of mesophase pitch from fluid catalytic cracking slurry

“…The preparation methods can be divided as follows, one-step polycondensation method, two-step polycondensation method, catalytic polycondensation method, pre-mesophase method, potential intermediate phase method and new mesophase method, [59][60][61][62] etc. And according to the principle and operation technology, the methods can be categorized as follows, direct thermal polycondensation method, [63][64][65] co-carbonization method, [66][67][68] hydrogen supply modication method, [69][70][71] cross-linking modi-cation method 72,73 and alkylation modication method. [74][75][76] The latter will be our next main focus.…”

Synthesis and Characterization of Novel Chiral Poly(imide-urethane) Derived from N,N′-(4,4′-carbonyl-diphthaloyl)-bis-(L-phenylalanine)diol with Different Diisocyanates

“…Good thermal, mechanical and electrical characteristics of polyimides make them highperformance groups in organic materials with widespread application [5][6][7]. Incorporation of these polyimides with urethane linkages generally provides poly(imide-urethane)s that have sufficient flexibility and good thermal, mechanical and electrical characteristics [8][9][10].…”

Synthesis and characterization of novel optically active poly(imide–urethane)s derived from N,N′‐(pyromellitoyl)‐bis‐(L‐leucine) diisocyanate and aromatic diols

“…However, they possess rigid crystalline structure of high symmetry which accounts for the high softening point, poor solubility in organic solvents and poor processability, which is a major handicap and restricts their use considerably 1–3. Incorporation of ether, carbonate, ester or urethane linkages into the polyimide backbone generally provides sufficient flexibility and processability without sacrificing the imide characteristics 4, 5…”