Highly Solvent‐Resistant Polystyrene Based on Uniform Tetraamide Units

Abstract

In this article, segmented multiblock copolymers are synthesized using monodispersed tetraamide (T6T6T or T6A6T dimethyl) as hard segments and hydroxy-terminated polystyrene (PSt) with a low molecular weight of 2500 g/mol as a soft segment. The soft segment length was varied from 2500 to 11,000 g/mol using dimethylterephthalate as a chain extender. The copolymers are characterized by inherent viscosity measurements, Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), water absorption, and solvent resistivity. The inherent viscosity increases with increasing soft segment length. Depending on the amide concentration in the copolymers, the hard segment melting temperature ranged between 248 and 287°C. From the FTIR, DSC, and wide angle X-ray diffraction results, it is concluded that the hard segments in the copolymer are crystallized completely. All the polymers showed single-stage decomposition temperature centered around 430°C. The solvent resistivity of these materials is extremely very high even at a low concentration of amide content (7%). C 2014 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21485; View this article online at wileyonlinelibrary.com.

Thermoplastic Elastomers Based on Functionalized Polystyrene with Crystallizable Diamide Segment: Synthesis and Characterization

“…In the melt, the amide segments are in the amorphous state and the amount of the amide carbonyl in the crystalline state is expected to be zero. Similar calculations are already reported in the literatures . IR spectra of the copolymers 1A, 1D (–(T–PSt)–PSt–TɸT)– n ), and 2A, 2D (–(T–PSt) y –PSt–T6T)– n ) at room temperature are presented in Fig.…”

“…Most of the studies are focused on the synthesis of segmented block copolymer containing diamide in combination with low T g amorphous polymer segments. However, some hard segments have also been incorporated in some high T g amorphous polymers such as poly(phenylether), poly(phenyleneoxide), polycarbonate, polysulfone, and polystyrene (PSt) . Segmented block copolymers of PSt‐T6T6T have a small crystallization window (<70°C) and despite this T6T6T segments are crystallized well and to a high degree.…”

Tri-Block Copolymer Based on Crystallizable Amide Segments and Functionalized Polystyrene

“…Tetrahydrofuran, toluene, methanol, dimethylformamide and aluminium oxide were purchased from S.D Fine Chemicals and used as such without further purification. The dihydroxy-terminated polystyrene unit is synthesized using a known route 17,18 . Three types of monodispersed hard segments were synthesized using a known route 5,6 .…”

Biodegradable poly(urethane-urea-amide): Synthesis, characterization and mechanical studies

“…The phase separation takes place due to the presence of flexible soft segments and partly crystallized hard segments. 1,2 The phase separation (in solids) could be facilitated when the segmented block copolymers using monodispersed crystallizable hard segments. [2][3][4] The monodispersed hard segment can crystallize fast and completely.…”

“…1,2 The phase separation (in solids) could be facilitated when the segmented block copolymers using monodispersed crystallizable hard segments. [2][3][4] The monodispersed hard segment can crystallize fast and completely. Aliphatic diisocyanates are the main source for prepare polyurethane and it is already being used as in vitro and in vivo applications.…”