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Showing 1–3 of 3 results
Advanced filters: Author: Yasuyuki Shudo Clear advanced filters

  • This rapid communication reports the first successful clarification of the difference in the crosslink inhomogeneity at the nanometer scale for two types of structurally identical epoxy resins cured with a phenolic hardener under organophosphine catalysts.

    • Takeshi Kakara
    • Atsushi Izumi
    • Keiji Tanaka
    Research
    Polymer Journal
    Volume: 57, P: 377-383

  • The network structure evolution of a hexamethylenetetramine-cured novolac-type phenolic resin was investigated using 1H-pulse NMR spectroscopy, SAXS and WAXS to elucidate the mechanism responsible for the apparent absence of inhomogeneity after curing, in which the inhomogeneity was first observed at the gel point.

    • Atsushi Izumi
    • Yasuyuki Shudo
    • Mitsuhiro Shibayama
    Research
    Polymer Journal
    Volume: 51, P: 155-160

  • The curing behavior of a novolac resin (NV) cured with hexamethylenetetramine (HMTA) under a two-roll mixing mill process, as well as the influence of an excess amount of HMTA on the curing reaction, were investigated by dynamic light scattering and gel permeation chromatography. The relationships between the number of mixing times, the weight-average molecular weight, hydrodynamic radius and the HMTA amount suggests that structural differences governing the mechanical properties of NV are initiated in the pregel stage.

    • Yasuyuki Shudo
    • Atsushi Izumi
    • Mitsuhiro Shibayama
    Research
    Polymer Journal
    Volume: 47, P: 428-433