Polymers with a Heteroatom in the Main Chain

Polymers with a heteroatom (—0—) in the main chain exhibit the highest intramolecular mobility. This applies in the first place to polyoxyethylene (tjmm 1 ns). 

Therefore, a precise determination of timm by thePi of anthracene-containing LM is impossible since the IMM of the polymer is higher than the mobility of the marker itself and, hence, the mobUity of the latter becomes the predominat relaxation process. 

the theoretical calculations and the conclusions on the free unhindered motion about the oxygen bridges in the main chain of polyamic acid have been confirmed. 

Among the vinyl polymers, polymethylene and poly(methyl acrylate) (PMA) exhibit the highest mobility (rj M 1 ns). According to data obtained by other methods  

We will now consider the effect of the introduction at the fi carbon atom of more bulky substituents than the hydrogen atom. To answer this question, polydimethoxy-ethylene (PDME) has been investigated The introduction of another even not very bulky substituent (—OCH3) at the /3 carbon atom lowers the IMM of this polymer to the same value as those of PMMA and PS (Table 8). The same conclusion on the pronounced effect of the substituent at can be drawn from the data obtained for poly(vinylbenzyI ether) (PVBE) and poly(propenylbenzyl ether) (PPBE) (Table 8). 

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