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Effect of oxidized carbon black on the mechanical properties and molecular motions of natural rubber studied by pulse NMR
Author(s) -
Asai Shigeo,
Kaneki Hiromune,
Sumita Masao,
Miyasaka Keizo
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430706
Subject(s) - natural rubber , carbon black , materials science , volume fraction , composite material , relaxation (psychology) , polymer , stress relaxation , elastic modulus , modulus , elastomer , stress (linguistics) , polymer chemistry , psychology , social psychology , linguistics , creep , philosophy
The mechanical properties such as elastic modulus and stress‐relaxation and spin‐spin relaxation time T 2 from pulse NMR were measured for surface‐oxidized carbon‐black‐filled natural rubber. The extent of reinforcement increased with CB volume percent in the range of 0–30%. At a given CB percent, this quantity increased by surface oxidation of fillers and decreasing filler size. From pulse NMR experiment, it was found that there were three components in rubber molecules which have different values for T 2 . Stress‐relaxation time and elastic moduli fitted one master curve against effective volume, fraction which is the sum of filler and bound rubber fraction. It was found that the distance between particle surfaces is the most important factor influencing reinforcing properties of filled polymers.