Dichloroketene, generated by the ultrasound-promoted dechlorination of trichloroacetyl chloride with zinc, has been added to the carbon-carbon double bonds of poly (1,1-dimethyl-l-sila-cis-pent-3-ene) (poly-I). The molecular-weight distribution of the adduct polymer in which all of the carbon-carbon double bonds have reacted with dichloroketene, poly[2,2-dichloro-cis-3,4-bis(methylene)cyclobutanone dimethylsilylene], 100% poly (I-CI2C=C~O), has been characterized by gel permeation chromatography. The microstructure of 100% poly(I-C12C=C=O ) has been elucidated by 1H, 13C and 29Si nuclear magnetic resonance as well as by infra-red spectroscopy. Similarly, a series of random copolymers have been prepared in which only some of the carbon-carbon double bonds of poly-I have reacted with dichloroketene. These have been characterized as above. The glass transition temperatures (Tg) of these copolymers, as well as that of 100% poly (I--C12C=C=O), have been determined by differential scanning calorimetry. The T 8 values are found to increase linearly with the percentage of the carbon-carbon double bonds of poly-I that have reacted with dichloroketene..
Посилання на статтю:
Partial and complete chemical modification of poly (1,1 -dimethyl-1 -sila-cis-pent-3-ene ) by addition of dichloroketene / Howard Shih Jen Lee and William P. Weber // Polymer. – 1992. – Vol 33. – P. 1748-1755.
