Reference

Synthesis of novel ladder polymers of poly(3,4-dihydro-2H-pyran-2-methanol)

Synthesis of novel ladder polymers of poly(3,4-dihydro-2H-pyran-2-methanol). Abdelaal, Magdy Youssef (Chemistry Department, Faculty of Science, Mansoura University, Mansoura ET-35516, Egypt). Journal of Polymer Science, Part A: Polymer Chemistry, 40(22), 3909-3915 (English) 2002 John Wiley & Sons, Inc. CODEN: JPACEC. ISSN: 0887-624X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polymers of bis(3,4-dihydro-2H-pyran-2-methyl) esters of oxalic, adipic, and phthalic acids were prepd. at different temps. in the presence of different cationic initiators, namely, the boron trifluoride/diethyl ether complex system, anhyd. ferric chloride, and p-toluene sulfonic acid. The obtained polymers were hydrolyzed under basic conditions, and the polydispersity indexes of these polymers were detd. before and after hydrolysis. The results are discussed to shed some light on the ability to use this anal. to investigate the precise structure of the obtained polymers and to predict the ability of these polymers to form ladder or semiladder polymers. Characteristics of such polymers were dependent, to some extent, on the type of crosslinks and the cationic initiators used for polymn. 3749-36-8 is the cas registry number. This chemical is also mentioned in this article. 16834-60-9 and 109-63-7 are also in the experiment. as well as the reaction temp. It seems possible to optimize the conditions leading to formation of ladder or semiladder polymers of bis(3,4-dihydro-2H-pyran-2-methyl) esters of oxalic acid and adipic acid, resp. The ladder structure was confirmed through detn. of the polydispersity index before and after hydrolysis of the polymer formed at different temps. and through computer-aided mol. modeling. ..