PHOTOINITIATION PERFORMANCE OF SOME KETONES IN THE LDPE-ACRYLIC ACID SURFACE PHOTOGRAFTING SYSTEM
PHOTOINITIATION PERFORMANCE OF SOME KETONES IN THE LDPE-ACRYLIC ACID SURFACE PHOTOGRAFTING SYSTEM
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DOI：
10.1016/s0014-3057(98)00231-6
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发表时间：
1999-08
影响因子：
6
通讯作者：
Wantai Yang;B. Rånby
中科院分区：
文献类型：
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作者：
Wantai Yang;B. Rånby
The photoinitiating performance of four kinds of ketones (alkyl-, alkyl phenyl-, phenyl- and di-ketones) and two aldehydes (formaldehyde and acetaldehyde) were examined by measuring their polymerization reactivity, grafting efficiency and surface wetting time with a simple technique, film interlayer photopolymerization (FIP), with LDPE as film substrate, acrylic acid as monomer and an HPM-15 Lamp (2 kW) as UV radiation source. Benzophenone, xanthone, acetophenone and 9-fluorenone are shown to be efficient photografting initiators for obtaining thick grafted layers, while anthraquinone, 4,4-dichlorobenzophenone, 4-benzylbenzophenone, benzoylformic acid and biacetyl are suitable photoinitiators for obtaining thin grafted layers. These results and subsequent analysis show that high triplet state energy, strong UV absorption, stable molecular structure and low initiating reactivity of the resulting ketyl free radical are decisive factors making the ketones efficient initiators for grafting applications.
