Abstract
Two types of interpenetrating polymer networks (IPNs) consisting of complex-forming polyoxyethylene (POE) and poly(acrylic acid) (PAA) as the first and second components, respectively, were prepared by matrix polymerization. One type of IPNs was semi-IPNs in which only PAA was crosslinked, and the other was full-IPNs with both POE and PAA crosslinking. Differential scanning calorimetry and solvent extraction on the semi-IPNs showed that POE forms a 1:1 complex with PAA and that only excess POE can be extracted. This complex formation may apply to the full-IPNs in which POE is not in excess of PAA. The glass transition temperature Tg, dynamic and static mechanical properties, and stress-strain behavior were examined. The semi- and full-IPNs with the PAA content between 30 and 60 mol% appeared to be single-phase systems, in which either amorphous POE or PAA was mixed with POE:PAA (1:1) complexes. These IPNs exhibited only one fairly sharp glass transition. In IPNs with either low or high PAA content, semicrystalline POE or amorphous PAA microdomains, respectively, were phase-separated from the complex phase. The extent of microphase separation was less in the full-IPNs than in the corresponding semi-IPNs.
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To distinguish various topologically different species of polymer alloys (=multicomponent polymers) made from the same constituent polymers, poly(A) and poly(B), we employ the following conventions: Block and graft polymers are designated as PA-PB; polymer blends and interpenetrating polymer networks (IPNs) as PA/PB, in which the presence of covalent bonds between the two components is unimportant; and polymer complexes or complex-forming systems as PA:PB, in which secondary interactions prevail.
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Adachi, H., Nishi, S. & Kotaka, T. Structure and Mechanical Properties of Sequential Interpenetrating Polymer Networks II. Complex-Forming Polyoxyethylene: Poly(acrylic acid) Systems1. Polym J 14, 985–992 (1982). https://doi.org/10.1295/polymj.14.985
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DOI: https://doi.org/10.1295/polymj.14.985