Synthesis and characterization of hydroxypropyl terminated polydimethylsiloxane‐polyurethane copolymers

Abstract

Polyurethane (PU) block copolymers were synthesized using prepared hydroxypropyl terminated polydimethylsiloxane (HTPDMS MW 990) and polyether diols (N-210) as soft segment with 4,4 0 -diphenylmethane diisocyanate (MDI) and 1,4-butanediol. This low molecular weight polydimethylsiloxanes (PDMS) containing hydroxypropyl end-groups displayed better compatibility with PU than common PDMS. In this article, we illustrate its synthesis routes and confirmed the proposed molecular structures using NMR and infrared radiation (IR). We varied the contents of HTPDMS and N-210 in soft segments 20 : 80, 40 : 60, 60 : 40, 80 : 20, and 100 : 0) to synthesize a series of PDMS-PU copolymer. IR spectroscopy showed the assignment characteristic groups of each peak in copolymers and confirmed that the desired HTPDMS-PU copolymers have been prepared. The different thermal, dynamic mechanical and surface properties of the copolymers were compared by thermogravimetry, DMA, contact angle and solvent resistance.

Crosslinked waterborne polyurethane with high waterproof performance

“…The particle sizes of the samples were measured by DLS. 29 From Fig. 1(h), the average particle size of the WPU dispersion is about 47 nm.…”

“…The morphology and size of the emulsion particles for other FSPU samples are similar to sample FSPU8. The particle sizes of the samples were measured by DLS 29. From Fig.1(h), the average particle size of the WPU dispersion is about 47 nm.…”

Influence of Hard Segments on the Thermal, Phase-Separated Morphology, Mechanical, and Biological Properties of Polycarbonate Urethanes

“…Most polyurethanes are multiblock co-polymers commonly consisting of hard and soft segments. For these types of materials, the various thermal and mechanical properties are determined by these alternating segments, repeating units of urethane linkages made by the reaction of an isocyanate with hydroxyl in polyurethanes, and especially the strong intermolecular forces of the hard domains [10,11]. In order to cater to specific property requirements, a large number of different polyurethanes were synthesized from the reaction between diisocyanate, microdiols, and the chain extender [12][13][14].…”