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Synthesis and characterization of new soluble polyamides containing ether and pendant cyclododecylidene groups
Author(s) -
Liaw DerJang,
Liaw BeenYang
Publication year - 1998
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(1998100)9:10/11<740::aid-pat809>3.0.co;2-c
Subject(s) - materials science , tetrahydrofuran , polymer , polymer chemistry , condensation polymer , differential scanning calorimetry , glass transition , polyamide , ether , thermogravimetric analysis , pyridine , triphenyl phosphite , dimethylformamide , ultimate tensile strength , organic chemistry , chemistry , composite material , solvent , physics , thermodynamics
A series of new soluble polyamides having flexible ether and bulky pendant cyclododecylidene groups in the polymer chain were prepared by the direct polycondensation of 1,1‐bis(4‐(4‐aminophenoxy)phenyl)cyclododecane ( BAPCD ) and various aromatic dicarboxylic acids in N ‐methyl‐2‐pyrrolidinone (NMP) using triphenyl phosphite and pyridine as condensing agents. Polymers having inherent viscosities of 0.74–1.00 dl/g were produced in high yield. Almost all the polymers could be readily dissolved in polar solvents such as NMP, dimethylsulfoxide, N,N ‐dimethylacetamide, N, N ‐dimethylformamide, m ‐cresol, pyridine and tetrahydrofuran. Most of the polymers could be solution‐cast into transparent, flexible, tough films which were further characterized by X‐ray and mechanical analysis. X‐ray diffractograms of polyamides indicated all polymers were amorphous except the polymer derived from rigid diacid such as 4,4′‐biphenyldicarboxylic acid. Most of the polymers revealed a distinct glass transition on the differential scanning calorimetry traces in the range of 234–273 °C. Thermogravimetric analysis showed that most of the polymers were stable up to 400°C in nitrogen atmosphere. The polymer films had a tensile strength range of 88–147 MPa and high tensile modulus range of 2.8–3.5 GPa. © 1998 John Wiley & Sons, Ltd.