The physical properties of aqueous cationic–nonionic polyurethane with poly(ethylene glycol methyl ether) side chain and its blend with aqueous cationic polyurethane

Abstract

ABSTRACT:The cationic-nonionic dispersing centers with different chain lengths of poly ethylene glycol methyl ether (N-PDEA 750, N-PDEA 2000) were prepared from N-diethanol amine (NDEA), isophorone diisocyanate (IPDI), and poly(ethylene glycol methyl ether) (PEO M w ϭ 750 and 2000), whereas aqueous cationic-nonionic polyurethane (N-PDEA PU) with different side chain lengths were prepared by N-PDEA 750 (or N-PDEA 2000), 4,4-methylene bis(isocyantocyclohexane) (H 12 MDI), polytetramethylene glycol (PTMG 2000), ethylene diamine (EDA), and glycolic acid (GA) as cationic-nonionic dispersing center, hard segment, soft segment, chain extender, and quarternizing agent, respectively. The thermal and mechanical properties of PU casting film were then discussed. We also used N-methyldiethyolamine (N-MDEA) without PEO as cationic dispersing center to synthesize aqueous cationic PU (N-MDEA PU). The PU blends were blending N-PDEA 750 PU and N-MDEA PU by different weight ratios and the physical properties of casting films and coated fabric of PU and PU blends were investigated. Regarding the thermal properties, we have found out that the cationic-nonionic PU (N-PDEA 750 PU, N-PDEA 2000 PU) has lower T gs , T ms , T mH , and ⌬H H than N-MDEA PU, apart from ⌬H s . The N-PDEA 2000 PU with longer side-chain PEO has lower T gs , higher T ms and ⌬Hs than N-PDEA 750 PU. As for mechanical property, N-PDEA PU has lower tensile strength of casting film compared with N-MDEA PU. Regarding the comparison of side chain length of PEO, N-PDEA 2000 PU with longer side chain has higher tensile strength than N-PDEA 750 PU with shorter side chain length. In addition, N-PDEA 2000 PU group that shows hard property in stress-strain curve, whereas N-PDEA 750 PU shows soft property. The tensile strength of PU blends decreases as the content of N-PDEA 750 PU increases. When the low-blend ratio of N-PDEA 750 PU (e.g., 5%), the tensile strength of casting film only shows less influence that can improve the elongation effectively. In terms of coating-treated fabrics, cationic-nonionic PU-coated fabrics show lower waterproof capacity (WP) than those treated by cationic PU. However, the water vapor permeability (WVP) and antiyellowing of the N-PDEA 750 PU coated fabrics are significantly better than the one treated by cationic polyurethane.

Synthesis and Properties of Novel Thermoplastic Poly(ester-ether-imide) Elastomers Derived from 4,4′-bis(N-trimellitimide)-diphenylether Unit with Excellent Thermal Stability

“…Polyurethane (PU) and poly(ester-ether) (PEE) which are composed of poly(butylene terephthalate) (PBT) as the hard segment, and poly(tetramethylene glycol) (PTMG) as soft segments are two kinds of famous thermoplastic elastomers (7,8). However, these two kinds of TPEs still have some disadvantages.…”

High‐performance PA1/TPU films with enhanced dielectric constant and low loss tangent

“…Therefore, the PA1 is supposed to be a promising material with high performance and multifunction. Simultaneously, as a unique polymeric material composed of block copolymers with alternating hard and soft repeating segments, TPU has many repeated carbamate groups in its molecular chain, which contains not only secondary amino group (NH) that can provide protons but also carbonyl group (CO) that can accept protons . Accordingly, a strong hydrogen bonding interaction between TPU and PA1 can be formed, which may be beneficial to improve the compatibility and dielectric properties of TPU.…”

The physical properties of nonionic waterborne polyurethane with a polyether as side chain

“…Nonionic polyurethanes, however, are more difficult to dispersing in water because of the weak hydrophilic character of the nonionic functional segments on backbone of polyurethanes. Recently, several scientists focused on the preparation and application of nonionic waterborne polyurethane which has hydrophilic side chains contributing to the stability of it in water system and simultaneously improving other mechanical properties 14–17. This article provides a convenient tactic that prepares a polyether with diols on chain end, which can react with isocyanates as a nonionic functional monomer.…”