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Electrical conduction and ultrasound wave propagation in particulate and short fiber composites of PVC. II: PVC‐Al coated glass fiber composites
Author(s) -
Dutta A. L.,
Misra A. K.,
Singh R. P.
Publication year - 1992
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730140210
Subject(s) - composite material , materials science , fiber , electrical resistivity and conductivity , glass fiber , composite number , thermal conduction , electrical engineering , engineering
Poly(vinylch1oride) composites containing 2 to 20 wt% of aluminum coated glass fiber (AlCGF) were prepared by the mechanical mixing and hot compression technique. Their electrical conduction and ultrasound wave propagation at frequencies of 2 to 9 MHz were studied. The electrical resistivity of these composites was lowered because of fiber‐fiber contact formation, which is evident from optical photomicrographs of the composites. Other morphological investigations, such as X‐ray diffraction and DTA, show matrix‐filler interaction. The limiting resistivity of PVC/AlCGF composite is 10 ohm‐cm at 14 wt% (8.11 vol%) of fiber concentration. Ultrasound wave propagation through these composites having fiber‐fiber contacts has shown that both absorption and velocity are high at 9 MHz. Other ultrasound parameters were studied, such as excess absorption, relative velocity, relative modulus variation with composition as well as with propagation constant. No definite correlation exists between electrical conduction due to fiber‐fiber contact formation and ultrasound wave propagation.