Studies on semi‐interpenetrating polymer network based on nitrile rubber and poly(methyl methacrylate)

Abstract

Sequential interpenetrating polymer networks (IPNs) based on nitrile rubber and poly(methyl methacrylate) (PMMA) were synthesized. IPN compositions were varied by varying the swelling time. Two methods were adopted for making IPNs. The first method is "singlestep IPN" (SIPN) and the second method is "multistep IPN" (MIPN). The compositions were fixed around 90, 80, 70, 60 and 50% of NBR. In SIPN mode, swelling in monomer and subsequent curing was done once. In MIPN mode, swelling in monomer and curing was repeatedly done. Tensile strength of IPNs was found to increase with PMMA content, MIPN showing higher strength compared to SIPN. Dynamic modulus showed a similar trend. The tan ␦ value was found to decrease with PMMA content. At 62/38 nitrile rubber (NBR)/PMMA, MIPN composition isolated tan ␦ peaks appeared near glass transition temperatures of NBR and PMMA, respectively. Scanning electron micrograph showed phase-separated morphology at the same MIPN composition. Solvent resistance increased with IPN formation maintaining higher resistance for MIPN compared to SIPN.

Dynamic mechanical properties of semi‐interpenetrating polymer network‐based on nitrile rubber and poly(methyl methacrylate‐co‐butyl acrylate)

“…[9][10][11] Among the above methods, interpenetrating polymer networks (IPNs) blends is a promising approach to obtain an advanced damping material. 20 Qin et al had succeeded in synthesizing a series of gradient IPNs of polyurethane/vinyl ester resin (PU/VER), resulting in the increased tan d value in the middle of the two loss peaks. 20 Qin et al had succeeded in synthesizing a series of gradient IPNs of polyurethane/vinyl ester resin (PU/VER), resulting in the increased tan d value in the middle of the two loss peaks.…”

“…17 Usually, the proper groups (such as acrylate and acrylonitrile group) in the matrix polymer is quite important to obtain the advanced damping materials, due to that the viscoelastic damping capability of a polymer is governed by the interaction of inherent V C 2013 Wiley Periodicals, Inc. groups, as suggested by Sperling. 20 Both NBR and poly(alkyl acrylate)s rubber, which have both acrylonitrile and acrylate groups in the polymer chain, are wellknown as the high performance specialty rubber for manufacturing seals and gaskets used in high-performance automotive engines because of its outstanding oil temperature resistance, which all exhibits efficient damping properties around T g. Furthermore, NBR/PMMA IPNs had been synthesized by single-step (SIPN) and multiplestep (MIPN) methods, which obtained tan d peaks of 0.3 with the temperature range (210 C < T < 80 C).…”

Phase-Separated Interpenetrating Polymer Networks

“…Because of this, up to now many publications have appeared where these properties are studied [203][204][205][206][207][208].…”

“…The components of thermoplastic AIPNs are capable of forming physical networks and are characterized by mutual penetration of phases. Thermoplastic AIPNs are intermediate between mixtures of linear polymers and true IPNs because they behave like chemically cross-linked polymers at relatively low temperatures, but as thermoplastics at elevated temperature [208]. The blends based on combinations of physically cross-linked polymer and linear polymer, or physically crosslinked polymer and chemically cross-linked (thermoset) polymer, where the physically cross-linked polymer network constitutes the continuous phase and the other component disperses into domains, will also exhibit the properties of thermoplastic compositions.…”

“…The method of mechanical blending of two (or more) polymers in the melt is one of the main methods of producing thermoplastic IPNs [208]. Thermoplastic AIPNs based on the same CPU and S-co-AA by mechanical blending of components in a common solvent were investigated by DMTA, DSC, WAXS, SAXS, TSDC, and other techniques by Sergeeva, Kyritsis et al [218][219][220][221][222].…”