Chloromethylstyrene-divinylbenzene copolymers

Nagakawa and co-workers [47] applied Py-GC to a structural study of various chloromethyl substituted PS copolymers prepared by different methods and they applied (TGA) gravimetric analysis to the dehydrochlorination and thermal degradation behaviour of these copolymers. Typical pyrograms of ST-DVB, styrene-chloromethylstyrene-divinylbenzene (ST-Cl-MST-DVB and chlorinated p-methyl styrene divinylbenzene copolymers are shown in Figures 1.5-1.7. 

Example 2. Acrylonitrile-butadiene rubber (5 wt.%) is dissolved in a mixture of chloromethylstyrene (82 wt.%) and divinylbenzene (10 wt.%) (mixture of o- and p-divinylbenzene). After benzoyl peroxide (3 wt.%) is dissolved in the mixture, the obtained pasty mixture is coated on a woven-cloth fabric made of poly(vinyl chloride) and polymerized at 80 °C for 16 h under nitrogen atmosphere, covered with a polyester film and then pressed with steel plates on both sides. After polymerization, the obtained membranous copolymer is immersed in trimethylamine (1 mol) mixed with acetone (25 wt.%) and water (75 wt.%) solution for 24 h at 30 °C to react with the chloromethyl groups of the membrane.37... 

To further confirm the effect of the tightness of the anion exchange membrane on permselectivity between anions, anion exchange membranes have been prepared by the reaction scheme shown in Figure 5.22.91 Namely, copolymer membranes composed of chloromethylstyrene and divinylbenzene are reacted with 4-vinylpyridine to form poly(4-vinylpyiridinium) in the cross-linked membrane matrix and then with trimethylamine to aminate the remaining chloromethyl... 

These polymers constitute the largest group to be discussed in this report and this is mainly because polystyrene and poly(chloromethylstyrene), often crosslinked with divinylbenzene, continue to be widely used in the preparation of functional polymers and resin-supported reagents. In fact most of the examples given here refer to the preparation of functional polymers rather than to new materials. This is a rapidly growing area of polymer chemistry and it is not possible to refer, in a compressed review of this nature, to all reports of functionalized styrene-based resins that have appeared in the past two years. This section falls naturally into three parts the first deals with styrene polymers and copolymers, the second with reactions on chloromethylated polystyrenes, and the third deals with styrene-related polymers. 

Hodges et al. [152] and Bian and Cunningham [153] reported the grafting of PS, poly(acetoxystyrene), poly[styrene-b-(methyl methacrylate-co-styrene)], poly(acetoxystyrene-co-styrene), and poly(styrene-co-2-HEMA) copolymers onto 2,2,6,6-tetramethyl-l-piperidinyloxy nitroxide (TEMPO) bound Merrilield resin. Merrifield resin is a PS resin based on a copolymer of styrene and chloromethylstyrene cross-linked with divinylbenzene. In these works, a pronounced increase of particle size was observed, which was attributed to the formation of chains both at the surface and within the microspheres. The polymerization control was enhanced both on the surface and in solution by the addition of sacrificial nitroxide. 

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