Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 26, Issue 8
Displaying 1-11 of 11 articles from this issue
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Index
Foreword
Technical Notes : Special Issue on New Functional Materials
Technical Report
Report from Overseas
Report of Meetings and Trade Fairs
Topic on Products and Technologies
Original Paper
  • Toughness of β-nucleated Isotactic Polypropylene
    Kouichi Hatada, Masataka Sugimoto, Masaru Ishikawa
    2014 Volume 26 Issue 8 Pages 407-413
    Published: 2014
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.4325/seikeikakou.26.407
    JOURNAL FREE ACCESS
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    The mechanism of improvement in toughness in β-iPP was studied on the basis of the fracture and plastic deformation mechanism of iPP. The toughness of β-iPP modified with a proper quantity of N, N'-dicyclohexyl-2,6-naphthalene dicarboxamide, as a β-crystal nucleating agent (0.05-0.15wt%) was improved in comparison with that of α-iPP. Although both the strength of craze and yield stress of β-iPP, which are characteristic values for fracture, were lower than those of α-iPP, the increase of the ratio of craze strength to yield stress resulted in the improvement of toughness of β-iPP. Furthermore, it was confirmed that the high density of microcraze contributes to the improvement of toughness of β-iPP because of the release of plastic constraint.
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