1996 Fiscal Year Final Research Report Summary
DEVELOPMENT OF IN SITU ELECTRIC MEASUREMENT OF VULCANIZAION OF RUBBER
| Project/Area Number |
08555175
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Material processing/treatments
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| Research Institution | KURUNE NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
MORI Tetsuo KURUNE NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF INDUSTRIAL CHEMISTRY PROFESSOR, 工業化学科, 教授 (10037963)
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| Co-Investigator(Kenkyū-buntansha) |
TSUDA Yusuke KURUME NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF INDUSTRIAL CHEMISTRY ASSOCIA, 工業化学科, 助教授 (30270367)
TOH Michiharu KURUNE NATIONAL COLLEGE OF TECHNOLOGY,DEPARTMENT OF INDUSTRIAL CHEMISTRY PROFESS, 工業化学科, 教授 (70037927)
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| Project Period (FY) |
1996
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| Keywords | Rubber / Vulcanization / Cure Curve / Dielectric Loss Tangent / Cure Meter |
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| Research Abstract |
Vulcanization of NBR rubber was carried out in a compression mold equipped with two electrodes for the electric measurement. Progress of vulcanization at the temperature of 130ﾟ, 140ﾟ, 150ﾟ, 160ﾟ and 170ﾟC was followed by the measurement of dielectric loss tangent (tandelta) and electric current applying alternating voltage.
Both of the tandelta and electric current-cure time curves showed a striking resemblance to the torque-cure time curve, which is widely used as a cure curve. That is, the time when the vulcanization is complete (t_<100>) and the apparent activation energy for vulcanization (E_a) obtained from the temperature dependence of t_<100> agreed with those from torquecure time curves obtained by a conventional rheometer.
Tandelta and electric current for the NBR composites without sulfur and accelerators increased gradually with time.
The cure time dependence of effective crosslink density showed good correlation with tandelta, electric current-cure time curves.
The result of electric measurement was discussed considering the rebber coumpounds as dielectric compounds comprised of parallel circuit of condenser (C) and resitance (R).
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Research Products
(4 results)
