期刊
JOURNAL OF POLYMER RESEARCH
卷 19, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1007/s10965-012-9955-9
关键词
Aliphatic diamines; Polymer synthesis; Fluorinated polyimides; Optically transparent; Solubility
资金
- Zhejiang Provincial Natural Science Foundation of China [LQ12B04001]
- Natural Science Foundation of Ningbo City, China [2012A610088]
- Program for Ningbo Innovative Research Team [2009B21008]
- Ningbo Key Lab of Polymer Materials [2010A22001]
- Guangdong Province and Chinese Academy of Science Comprehensive Strategic Cooperation Project [2011B090300094]
Two new aliphatic diaminemonomers, one containing cyclohexane moiety and the other containing both cyclohexane and trifluoromethyl moieties, were synthesized. Two series of semi-aromatic polyimides (PIs) derived from the two diamines were prepared by one-step solution polycondensation using m-cresol as solvent. These PIs had inherent viscosities between 0.32 and 1.20 dL/g and could be processed to colorless, flexible and tough films. Compared with the PIs without trifluoromethyl group, the PIs with trifluoromethyl group showed better solubility in many solvents such as DMAc, NMP and m-cresol. It was also found that all the PI films had high optical transparency in the visible region with the cut-off wavelength of 291-379 nm. However, compared with the non-fluorinated PI 5 series, the PI 4 series showed lighter color. Furthermore, thermal analysis showed that the synthesized PIs had 5 % weight lost temperature (T-5%) in N-2 of 372-425 degrees C, and the glass transition temperature (T-g) of 221-270 degrees C. Moreover, all the PIs showed good mechanical properties with the tensile strengths of 80-114 MPa, tensile moduli of 2.7-3.5 GPa, and elongation at breaks of 5.1-26.5 %.
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