Polymers modification with

Kirkpatrick J.P. and Preston D.T., Polymer modification with styrenic block copolymers, Elastomerics, 120, 30, 1988. 

Because the order due to both liquid crystallinity and three-dimensional crystallinity reduces the mobility of the amorphous regions of a polymer, as in the BDA/HD hanopolyester, the "effective Tg is higher than it would be in an amorphous, unordered polymer. Modification with EG decreased the order due to three-dimensional crystallinity, and the Tg initially decreased. 

T. SEGUCHI, T. YAGI, S. ISHIKAWA, Y. SANO, New material synthesis by radiation processing at high temperature — polymer modification with improved irradiation technology , Rad. Phys. Chem., 63 (2002) 35-40... 

Another important area of polymer modification with subcritical and supercritical water is the hydrolysis of polycondensation polymers such as polyethylene terephthalate (PET), polyurethanes, and nylons for conversion to their monomers [ 37]. Specifically, in supercritical water, 91 % monomer recovery (terephthalic acid) is achieved at 400 °C and 400 bar in less than 15min reaction times [38]. Studies of these reactions using a hydrothermal diamond anvil cell to follow the phase changes during the reaction of PET... 

LIQUID CRYSTAL POLYMERS Modification With Flexible Units... 

Finally, it is appropriate to say a few words on the choice of solvent for the chemical modification of polymers under phase transfer catalysis. As was mentioned earlier, numerous reactions which do not proceed in non-polar solvents such as toluene or dichloromethane in the absence of a phase transfer catalyst do proceed satisfactorily In DMF. Thus, many research groups, including ours, have used DMF extensively in polymer modifications with or without added catalyst, with increases in reaction rates and conversions being observed in the former case. As DMF is often a solvent for both the polymer and, in many instances, at least some of the reagent, it is debatable whether or not the term "phase transfer catalysis" applies (Ref. 50). More important perhaps is the fact that considerable amounts of dimethylamine can be produced through decomposition of DMF when the solvent is treated with concentrated aqueous base in the presence of a phase transfer catalyst. Obviously this may lead to undesirable side-reactions with incorporation of dimethylamine moieties into the modified polymers (Ref. 50). 

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