Synthesis and Characterization of New Polycarbonate-Based Poly(thiourethane-urethane)s

Abstract

The new segmented poly(thiourethane-urethane)s (PTURs) based on 1,1′-methanediylbis(4-isocyanatocyclohexane) (HMDI, Desmodur W®), polycarbonate diol (PCD, Desmophen C2200) and (methanediyldibenzene-4,1-diyl)dimethanethiol were synthesized by one-step melt polyaddition method. The obtained PTURs, with a content of 30–60 wt% of the hard segments (HS), were tested in which the influence of changes in the HS content on their properties was determined. The polymers were characterized by Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), thermal analysis (DSC, TGA) and thermomechanical analysis (DMTA). Additionally, tensile strength, optical (refractive index, UV-VIS and color) and surface properties of the obtained polymers (contact angle and surface free energy) and adhesion to copper were examined. FTIR analysis verified the supposed structure of the polymers obtained and showed a complete conversion of the isocyanate groups. TGA analysis confirmed the relatively good thermal stability of the polymers. On the other hand, after performing the DSC analysis, it was possible to state that the obtained materials were partially or completely amorphous, and the microphase separation decreased with increasing HS content in the polymer. Similar observations were made from the DMTA data. In addition, the hardness, tensile strength, modulus of elasticity, storage modulus, adhesion to copper, refractive index and total free surface energy increased with increasing HS content in the polymer.

Synthesis of porous polymers by polymerization‐induced phase separation in the addition reaction of multifunctional isocyanates and dithiol compounds

“…Absorption peaks derived from the NCO group in MR200 at 2250 cm −1 and the SH group in HDT at 2550 cm −1 were hardly detected. The characteristic peaks derived from thiol‐urethane bond was newly detected at 1646 cm −1 (CO stretching), 1512 cm −1 (NH bending), and 3290 cm −1 (NH stretching) in the porous polymer 23–25 . The peaks derived from methylene (2925, 2850, and 764 cm −1 ), CN (1407 and 1305 cm −1 ), and phenyl group (3028–3105, 1600, 889, and 810 cm −1 ) were also detected.…”

“…The characteristic peaks derived from thiol-urethane bond was newly detected at 1646 cm À1 (C O stretching), 1512 cm À1 (N H bending), and 3290 cm À1 (N H stretching) in the porous polymer. [23][24][25] The peaks derived from methylene (2925, 2850, and 764 cm À1 ), C N (1407 and 1305 cm À1 ), and phenyl group (3028-3105, 1600, 889, and 810 cm À1 ) were also detected. The peaks at 1150 cm À1 and 1240 cm À1 would be attributed to the appearance of C O connected to N H [26][27][28] or C S. These results indicate the reaction should successfully occur in the reaction system.…”

Special Issue: Synthesis, Processing, Structure and Properties of Polymer Materials

“…In this Special Issue, 33 original articles have been published on various topics, including the preparation, characterization, and some examples of application of polymeric materials. This issue includes review articles [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ] and research articles [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

“…The scope of research articles of papers included a Special Issue is very wide. It includes papers on the synthesis and study of the properties of new thermoplastic polymers [ 9 , 10 , 11 , 12 , 13 ], obtaining of composites [ 14 , 15 , 16 ], nanocomposites [ 17 , 18 , 19 ], microspheres [ 20 , 21 ], polymeric blends [ 22 , 23 , 24 ], hydrophobic nanostructures [ 25 ], polymeric membranes [ 26 , 27 ], hydrogels [ 28 ] and others [ 29 , 30 , 31 , 32 , 33 ].…”

“…Such polymers have a high potential for the production of environmentally friendly bio-based polyurethanes. Puszka and Sikora [ 12 ] presented the synthesis and detailed characterization of the structure and properties of poly(thiourethane-urethane) elastomers with a polycarbonate soft segment.…”