Publication: Controlled degradation of cured natural rubber by encapsulated benzophenone as a photosensitizer
Issued Date
2003-10-03
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ISSN
00218995
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2-s2.0-0042389537
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Applied Polymer Science. Vol.90, No.1 (2003), 297-305
Suggested Citation
Sa Ad Riyajan, Jitladda Tangpakdee Sakdapipanich, Yasuyuki Tanaka Controlled degradation of cured natural rubber by encapsulated benzophenone as a photosensitizer. Journal of Applied Polymer Science. Vol.90, No.1 (2003), 297-305. doi:10.1002/app.12784 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/20806
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Title
Controlled degradation of cured natural rubber by encapsulated benzophenone as a photosensitizer
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Abstract
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,1H-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 apply 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.