Photocrosslinking of chlorinated polydimethylsiloxanes
β Scribed by Hiroshi Inoue; Shigemi Kohama
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 487 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0021-8995
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β¦ Synopsis
Photocrosslinking behavior of chlorinated polydimethylsiloxanes (CPDMS) has been studied. It was found that the viscous CPDMS were readily crosslinked to form the rubberlike materials on irradiation from a high pressure mercury lamp. The crosslinking mechanism was proposed on the basis of infrared spectroscopy. It was suggested that the photolysis of the carbonchlorine bond induced by the ultraviolet irradiation is a primary step for crosslinking, and is followed by mutual combination of SiCH2. radicals, eventually, to form the crosslinked C PDMS. The effect of halogens and atmosphere on the crosslinking was also discussed.
π SIMILAR VOLUMES
Only two examples of cycloaddition to ynamines have so far been reported 121. By 1,3-dipolar cycloaddition under the conditions described previously 131, ynamines readily afford dialkylamino-substituted heterocycles ( I ) (Table 1). The structure of the products follows from analytical data and in a