Chlorination polystyrene

Fig. 5 Microwave-assisted loading protocol of carboxylic acids to chlorinated polystyrene Wang resin...

A different chlorinated polystyrene is indicated in literature [1] as poly(chlorostyrene), CAS 9022-52-0. Halogenated polystyrenes also include poly(p-chloro-a-methylstyrene), poly[p-(2,4-dichlorobenzyl)-styrene], etc. Thermal degradation, not necessarily by flash pyrolysis, has been studied and reported for a number of halogenated polystyrenes [2, 3], and poly(a-methylstyrenes). Some of these reports are summarized in Table 6.4.1 [1]. 

Figure 2. Experimental data on copolymer resist sensitivities in relation to constituent monomer mole fraction. The following references and abbreviations are used P(ST-CMS), chloromethylated polystyrene (8) P(ST-CS), chlorinated polystyrene ( ) P(ST-IS), iodi-nated polystyrene (100 P(ET-CE), chlorinated polyethylene ( 6)a P(ET-BE), brominated polyethylene C165a P(ST-GMA), poly (styrene glycidyl methacrylate)...

When some or all of the phenyl rings are substituted with halogen (Scheme 6.11), the radiation sensitivity and the cross-linking efficiency of polystyrene can be enhanced significantly. Negative electron-beam resist formulated from iodi-nated and chlorinated polystyrene and based on this approach have been reported. Sensitivity of about 2 p.C/cm and resolution of about 1-p.m features have been demonstrated with these materials. ... 

Prud homme [ 144,145] noted miscibility of PCL with chlorinated polystyrene and poly(viny-lidene chloride) (PVCL) and concluded the observed miscibility was the result of dipole-dipole interactions. This result indicated that the miscibility of PCL/PVC could be the combination of hydrogen bonding and dipole-dipole interactions. Examples of miscibility ascribed to dipole-dipole interactions include PEO/PMMA, PYAc/PEO, PVF2 with poly(meth)acrylates and PVAc [146-148]. 

Figure 2 TVA curves for degradation under vacuum at 10°Cmin" of chain-chlorinated polystyrenes containing (a) 0.54,...

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