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Relationships among blending conditions, size of dispersed phase, and oil resistance in natural rubber and nitrile rubber blends
Author(s) -
Sirisinha Chakrit,
BaulekLimcharoen Sauvarop,
Thunyarittikorn Jarunee
Publication year - 2001
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.1957
Subject(s) - natural rubber , materials science , nitrile rubber , composite material , rheology , ultimate tensile strength , phase (matter) , nitrile , viscosity , morphology (biology) , mooney viscosity , polymer blend , copolymer , polymer , chemistry , organic chemistry , biology , genetics
The rheological properties, morphology, and oil resistance in natural rubber and nitrile‐butadiene rubber (NR/NBR) blends are investigated as functions of the blending conditions. It is found that the Mooney viscosity of the blends depends more strongly on the blending time than the rotor speed. The size of the NR dispersed phase is approximately independent of the rotor speed, but it decreases with increasing blending time up to 25 min. With a further increase in the blending time the NR dispersed phase size decreases. The results for the relative tensile strength, which is an indicator of oil resistance, are in agreement with those of the blend morphology, indicating that the oil resistance in a 20/80 NR/NBR blend strongly depends on the phase morphology of the blend. The smaller the size of NR dispersed phase, the higher the blend resistance to oil. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1232–1237, 2001