Abstract
The dynamic mechanical properties and the phase structures of some heterogeneous network polymers, such as poly(glutamic acid) [PGA]—poly(oxypropylene) glycol [PPG, Mn=400], PGA—poly(oxyethylene) glycol [PEG, Mn=330], and poly-(acrylic acid) [PAA]—PEG were compared to each other to investigate the relationship between the mechanical properties and the aggregation state of the component polymers. When compared with PGA—PEG300 at the same PGA content, the PGA—PPG400 showed the following characteristics: (1) the dynamic mechanical tanδ curves are much broader, (2) the tanδ peak temperatures are higher, and (3) the E′ values above the transition regions are lower. The most striking characteristics of PAA—PEG compared with PGA—PPG400 and PGA—PEG300 were: (1) E′ in the rubbery plateau region increases in proportion to the crosslink density; (2) the tanδ maximum values are as large as 1.0—1.5; and (3) the shape of the tanδ curves is sharp and is little affected by the composition. The differences in the properties among the heterogeneous network polymers were discussed in terms of characteristic properties of PGA, the compatibility of the component polymers, and the reaction temperature.
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Mori, T., Imada, K., Tanaka, R. et al. Heterogeneous Network Polymers. V. Heterogeneous Network Polymers from Poly(L-glutamic acid), Poly(acrylic acid), and Polyether Glycols. Polym J 10, 45–57 (1978). https://doi.org/10.1295/polymj.10.45
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DOI: https://doi.org/10.1295/polymj.10.45