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High Glass Transition and Optical Transparency of Novel Organosoluble Polyamides Containing 4‐ tert‐ ‐Butyltoluene Moiety
Author(s) -
Wang Chenyi,
Zhao Xiaoyan,
Li Guang,
Jiang Jianming
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201180380
Subject(s) - polyamide , moiety , chemistry , glass transition , dimethylacetamide , solubility , solvent , condensation polymer , polymer chemistry , amide , casting , polymer , chemical engineering , organic chemistry , materials science , composite material , engineering
A series of novel polyamides 3a – 3d containing 4‐ tert‐ butyltoluene moiety, were prepared using the phosphorylation polycondensation technique. FT‐IR and 1 H NMR techniques were used to investigate the chemical structures of 3a–3d . The results confirmed that they agreed with the proposed structures for 3a – 3d completely. The 3a – 3d had inherent viscosities ranging from 0.71 to 1.67 dL·g −1 . All the polyamides showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most amide polar solvents. Flexible and tough polyamide films could be prepared by casting from DMAc ( N , N ‐dimethylacetamide) solvent. Their films were nearly colorless and exhibited high optical transparency, with the UV cutoff wavelength in the range of 346–363 nm and transmittance higher than 80% at 450 nm. They also exhibited high glass transition temperatures in the range of 310–343°C and the onset decomposition temperatures in the range of 435–462°C in nitrogen atmosphere. Meanwhile, these polyamide films possess good mechanical properties with tensile strengths of 76.4–86.1 MPa and elongations at break of 11.2%–27.3%. Due to those properties, these polyamides could be considered as photoelectric and microelectronic materials.