1396314-59-2Relevant academic research and scientific papers
Synthesis and properties of cross-linkable high molecular weight fluorinated copolyimides
Yao, Hongyan,Zhang, Yunhe,Liu, Yu,You, Kaiyuan,Liu, Shanyou,Liu, Baijun,Guan, Shaowei
, p. 349 - 359 (2014)
A series of novel high molecular weight fluorinated co-polyimides (Co-PIs) containing styryl side chain based on 1,3-bis(2-trifluoromethyl-4-aminophenoxy)- 5-(2,3,4,5-tetrafluorophenoxy)benzene (6FTFPB) were successfully synthesized. The weight-average molecular weights (Mws) and polydispersities of the co-polyimides were in the range 8.93-10.81 × 104 and 1.33-1.82, respectively. The co-polyimide film showed excellent solubility in organic solvents, high tensile properties (tensile strength exceeded 91 MPa), excellent optical transparency (cutoff wavelength at 332-339 nm and light transparencies above 89% at a wavelength of 550 nm), and high thermal stability (5% thermal weight-loss temperature up to 510 °C). The casting and spinning films could be cross-linked by thermal curing. The cured films show better combination property (including excellent resistance to solvents) than that of co-polyimides. For instance, the glass transition temperature of Co-PI-1 (the molar weight ratio of 6FTFPB was 30%) increased from 217 to 271 °C, the tensile strength enhanced from 94 to 96 MPa, the 5% thermal weight-loss temperature improved from 514 to 525 °C. Moreover, after cured, Co-PI-1 film also has a coefficient of thermal expansion (CTE) value of 60.3 ppm °C -1, low root mean square surface roughness (Rq) at 4.130 nm and low dielectric constant of 2.60. 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 349-359 Novel cross-linkable high molecular weight fluorinated copolyimides are synthesized. The copolyimides exhibit excellent solubility, high tensile properties, and good optical transparency. The copolyimides can cross-link thoroughly after curing at 260 °C under a vacuum. The cured copolyimides have excellent chemical resistance and high thermal properties. The obtained cured films have a low dielectric constant and excellent surface planarity. Copyright
