Synthesis and properties of poly(imide siloxane) block copolymers with different block lengths

Abstract

Several poly(imide siloxane) block copolymers with the same bis(c-aminopropyl)polydimethylsiloxane (APPS) content were prepared. The polyimide hard block was composed of 4,4 0 -oxydianiline and 3,3 0 ,4,4 0 -diphenylthioether dianhydride (TDPA), and the polysiloxane soft block was composed of APPS and TDPA. The length of polysiloxane soft block increased simultaneously with increasing the length of polyimide hard block. For better understanding the structure-property relations, the corresponding randomly segmented poly(imide siloxane) copolymer was also prepared. These copolymers were characterized by FT-IR, 1 H-NMR, dynamic mechanical thermal analysis, thermogravimetric analysis, polarized optical microscope, rheology and tensile test. Two glass transition temperatures (T g ) were found in the randomly segmented copolymer, while three T g s were found in the block copolymers. In addition, the T g s, storage modulus, tensile modulus, solubility, elastic recovery, surface morphology and complex viscosity of the copolymers varied regularly with increasing the lengths of both blocks.

Production of Poly(Imide Siloxane) Block Copolymers

“…Thus, the obtained copolymers were called randomly segmented poly(imide siloxane) copolymers. Copolymerization is one of the most general and successful ways for preparation of new materials with specifically desired properties (Pei et al 2013). Combination of polysiloxane and polyimide increased solubility and processability of polyimide.…”

“…By this property, substrates will protect the active solar cell layers against the penetration of water vapor. For such properties, poly(imide siloxane) copolymer materials are accepted as the suitable candidates for use in solar cell technology (Ghosh et al 2009(Ghosh et al , 2010Pei et al 2013;Yoo and Park 2010). Hence, this study was initiated to get poly(imide siloxane) copolymers as a polyimide form which have better properties than polyimide.…”

“…The use of flexible substrates is preferred for the main applications in solar cells because roll-to-roll processing makes them very interesting to reduce the production costs as well as the energy payback time. Poly (imide siloxane) materials are accepted as suitable candidates for use in solar cell technology (Ghosh et al 2009(Ghosh et al , 2010Pei et al 2013;Cazacu et al 2001;Arnold et al 1989;Wohl et al 2012Freidrich et al 2004.…”

Superhydrophobic behavior of polyimide–siloxane mats produced by electrospinning

“…5 wt% weight loss temperatures (T 5% ) were in the range of 448-493°C. T 5% is probably due to the thermal degradation which began at the n-propyl linkages in the copolymers [35]. It is well known that the aromatic homopolyimides show very high thermal stability and the significant mass loss does not start until around 500°C [36].…”

Study on waterborne polyurethanes based on poly(dimethyl siloxane) and perfluorinated polyether

“…[16][17][18][19][20] The introduction of silicon can be broadly divided into chemical and physical compound. The silicon segments of the polyurethane are introduced by reaction of end group containing active hydrogen of higher molecular weight of methyl silicone and polyurethane prepolymer remaining isocyanate, so this organosilicon modification can effectively contain silicon segments that endow the polymer performance, but it would have been produced different degree of phase separation in the molecular chain segment size.…”