Copolymers of TXN with other Heterocyclic Monomers

3 Copolymers of TXN with Other Heterocyclic Monomers TXN is copolymerized with DXL or EO to prepare thermally stable polyoxymethylene. Although there have been several attempts to replace these with other comonomers (some of them, e.g. DXP, indeed offer some advantages) 140) it seems that DXL and EO retain their superior position among cyclic comonomers acting as zipper jammers . 

There has been a considerable amount of work directed towards the preparation of new copolymers of TXN. TXN easily copolymerizes with heterocyclic and some vinyl monomers. The patent literature discloses hundreds of attempted copolymerizations. We will not cover this literature extensively because, as we have stressed above, the best solution for practical purposes is copolymerization with DXL or EO, or terpolymerization with diepoxides when a higher modulus is desired 141  

One may prepare new products differing in properties from the basic polyacetal by functionalization of polyTXN. For example, the following approach may be used  

Ionomers having [t ] up to 1 dl/g (0.1% soln. in 98/2 p-chlorophenol-a-pinene at 60 °C) and with up to 9 % mol comonomer were prepared by this method. A similar reaction was studied by Hermann and Burg 143 

With the same aim of preparing polyTXN ionomers Vogl and MacKnight studied the copolymerization of TXN with ethyl glycidate 144,145). The copolymers were subsequently converted to the corresponding polyacids  

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