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Controlled degradation of cured natural rubber by encapsulated benzophenone as a photosensitizer
Author(s) -
Riyajan SaAd,
Sakdapipanich Jitladda Tangpakdee,
Tanaka Yasuyuki
Publication year - 2003
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.12784
Subject(s) - natural rubber , photodegradation , formaldehyde , urea formaldehyde , benzophenone , materials science , chemical engineering , polymer chemistry , fourier transform infrared spectroscopy , ultimate tensile strength , urea , chemistry , composite material , nuclear chemistry , organic chemistry , catalysis , adhesive , photocatalysis , layer (electronics) , engineering
The photodegradation of raw natural rubber and natural rubber compound film were studied using an artificial solar energy simulator. The properties of degraded rubber sheets containing benzophenone (BP) were determined by solution viscosity, 1 H‐NMR, and FTIR analyses. In the case of rubber compounds containing BP, the changes of tensile strength and crosslinking density were determined. It was found that BP could amply accelerate the photodegradation of rubber. To control the release rate of BP, it was necessary to encapsulate BP with urea–formaldehyde as a matrix. The encapsulated BP or capsule was formed by an interfacial polycondensation reaction between formaldehyde and urea. The kinetic of release rate of BP from urea–formaldehyde capsule was markedly observed within 15 days of release time; after that the rate of BP released from urea–formaldehyde microcapsule was very slow. At the same concentration of BP, the degradation rate of rubber compound by adding BP directly was faster than that of the rubber containing encapsulated BP. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 297–305, 2003