Journal of The Adhesion Society of Japan
Online ISSN : 2187-4816
Print ISSN : 0916-4812
ISSN-L : 0916-4812
Volume 46, Issue 2
Displaying 1-4 of 4 articles from this issue
Review
Review
Original Paper
  • Yoshiaki URAHAMA
    2010 Volume 46 Issue 2 Pages 53-62
    Published: February 01, 2010
    Released on J-STAGE: June 30, 2014
    JOURNAL FREE ACCESS
    Pulsed NMR is ananalytical method that can detect molecular mobility of multi-component system. Because it is possible to separate the relaxation behavior of the each component quantitatively, it has been used to analyze the phase structure and the characteristics of the pressure sensitive adhesives. Although the measured macroscopic magnetization M(t) was data with plenty of chemical and physical information, the information have not been fully analyzed by conventional, commercially availablesoftware. By the improvement in performance of personal computers and the development of the numerical processing algorithm, a program to obtain relaxation spectra by numerical differentiation of the macroscopic magnetization M(t) was created. The relaxation spectra have much amount ofinformation on molecular mobility of polymers, compared with conventional T2 relaxationtime. Therelaxation spectra of pressure sensitive adhesives composed of SIS/tackifier system were obtained using the program. The elucidation of the interaction of a polymer and a tackifier became clear from the relaxation spectrum. The analysis using the relaxation spectra is a very useful method to lead the molecular design and the formulation of pressure-sensitive-adhesives.
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Original Paper
  • Shigeki HIKASA, Kazuya NAGATA, Yoshinobu NAKAMURA
    2010 Volume 46 Issue 2 Pages 40-52
    Published: February 01, 2010
    Released on J-STAGE: June 30, 2014
    JOURNAL FREE ACCESS
    Relation between morphology and mechanical properties of Polypropylene (PP)/elastomer/filler ternary composites were investigated. Polystyrene-block-poly (ethylene-butene)-block-polystyrene triblock copolymer (SEBS) or carboxylated SEBS (C-SEBS) was used as elastomer and calcium carbonate (CaCO3) having mean size about 160nm was used as filler.In the PP/SEBS/CaCO3 ternary composite, CaCO3 particles and SEBS particles were dispersed in the PP matrix separately. In the PP/C-SEBS/CaCO3 ternary composites, CaCO3 particles were encapsulated in C-SEBS and core-shell particles were formed at lower CaCO3 concentration. However, at higher CaCO3 concentration, some CaCO3 particles were dispersed in PP matrix.Modulus of the PP/SEBS/CaCO3 composites was in agreement with expanded Lewis-Nielsen's equation. On the otherhand, the modulus of the PP/C-SEBS/CaCO3 composites was in agreement with elastomer enforced Nielsen's equation.Tensile yield stress of the PP/SEBS/CaCO3 composites was in agreement with Pkanzsky's equation. However, the tensile yield stress that of the PP/C-SEBS/CaCO3 is higher than the Pkanzsky's equation, because a part of CaCO3 particles was included into the C-SEBS particles.In the PP/SEBS/CaCO3 composite, the impact strength increased with the amount of incorporated CaCO3 particles. Whereas, in the PP/C-SEBS/CaCO3 composite, the impact strength increased dependent upon the amount of CaCO3 particles dispersed in PP matrix.
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