Why aromatic resin has poor UV resistance than aliphatic and cycloaliphatic? For aromatic cyclic diacid ,why ortho , meta substitution more durable than para?
Aromatic resins absorb UV more strongly than cyclolaliphatic ones, their functionalizatio or decomposition is easier.
Some further reading:
https://www.shimadzu.com/an/uv/support/uv/ap/apl.html
http://www.uobabylon.edu.iq/eprints/publication_11_8282_250.pdf
http://iopscience.iop.org/article/10.1070/RC1985v054n11ABEH003156/meta
http://turroserver.chem.columbia.edu/courses/MMP_Chapter_Updates/MMP+Ch%2012%20050704.pdf
https://books.google.hu/books?id=ACECS7yCEkEC&pg=PA111&lpg=PA111&dq=photochemistry+aliphatic+aromatic&source=bl&ots=zwBRvBCLLG&sig=wRi5y2e2FgZmhGz2q-hJzcBvGoY&hl=hu&sa=X&ved=0ahUKEwj145yp-enYAhUEXCwKHQWLBZU4ChDoAQhAMAQ#v=onepage&q=photochemistry%20aliphatic%20aromatic&f=false
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