Tensile property of modified hydroxyl-terminated polybutadiene-based polyurethanes

Abstract

Modified hydroxyl-terminated polybutadiene (HTPB)-based polyurethanes (PUs) were prepared by three different processes: crosslinkage of the soft segment, complexation of the hard segment, and the interpenetrating network (IPN). Crosslinked PU films were prepared by the addition of a crosslinking agent of divinylbenzene (DVB) to the 4,4 -dicyclohexylmethane diisocyanate (H 12 MDI) and 1,4-butanediol (1,4-BD)-based PUs. The ionic polymer was prepared by adding N-methyldiethanolamine (MDEA), which possesses tertiary amine used as chain extender, to the HTPB-H 12 MDI-based PUs and then complexed by cupric chloride with MDEA. An IPN was formed by the introduction of 4-vinylpyridine (4-VP) to the benzoyl peroxide (BPO)-crosslinked HTPB-H 12 MDI-1,4BD-based PUs. FTIR was utilized to identify the segregation between hard and soft segments and structure change, which affects the tensile properties. The change of the glass transition temperature was detected by DSC, which can be used to manifest the modified PUs. Thermal decomposition behaviors conducted by TGA were used to investigate the formation of an IPN. The hydrogen-bonding index (HBI), frequency difference, and shift as a measure of the phase segregation and the average strength of the interpolymer hydrogen bonds were utilized to study the intermolecular interaction and tensile property of the prepared PUs. The effect of the hard-segment content, DVB content, amount of cupric ion, and 4-VP content on the tensile property were investigated. The stress was largely increased by the modification of PUs, while the strain still remains an appreciable value compared with that of unmodified PUs.

RETRACTED: Investigation of structure‐performance properties of a special type of polysulfone blended membranes

“…Cabasso et al added poly (vinylpyrrolidone) to polysulfone solution and found that the tensile strength of the polysulfone hollow fiber was decreased. Huang et al have studied the effect of hydroxyl‐terminated polybutadiene‐based polyurethanes to improve the mechanical properties of polysulfone membranes. Lai et al have concluded that the presence of nonionic surfactants in a polymer casting solution could improve the mechanical properties of prepared membranes.…”

Polyurethane elastomers based on amphiphilic poly(caprolactone)‐b‐poly(butadiene)‐b‐poly(caprolactone) triblockcopolyols

“…Oligomeric hydroxy‐terminated polybutadienes (HTPB) can potentially be used as a polyol component in the synthesis of more hydrophobic polyurethanes . HTPBs are also commercially available products used in composite propellants, adhesives, sealants, high‐quality binders for rubber crumb, potting materials and in electrical isolation, and gas separation equipment .…”

Modified polydimethylsiloxane/polystyrene blended IPN pervaporation membrane for ethanol/water separation

“…If the performance of membranes was improved modestly so as to exhibit either the pervaporation total flux of 0.15 kg m −2 h −1 or selectivity of 10.3 for ethanol to water. By affinity, rubbery polymers are the most suitable material for hydrophobic/organophilic pervaporation separation; namely polybutadiene,5 terpolymer ethene‐propene‐diene (EPDM),6 poly(ether block amide) (PEBA),7, 8 polyviniylidene fluoride,9 and the most frequent is polydimethylsiloxane 10–15…”