@article{oai:kyutech.repo.nii.ac.jp:00005535,
 author = {Mori,  Tomokazu and Nishida, Haruo and 西田, 治男 and Shirai, Yoshihito and 白井, 義人 and Endo, Takeshi and 遠藤, 剛},
 issue = {2},
 journal = {Polymer Degradation and Stability},
 month = {May},
 note = {Thermal degradation of high molecular weight PLLA containing residual tin atoms was investigated as a means of controlling the reaction for feedstock recycling to L,L-lactide. To clarify the pyrolysis mechanism of the PLLA, three samples with different chain end structures were prepared, namely, as-polymerized PLLA-ap, precipitated-with-methanol PLLA-pr, and purified PLLA-H. From pyrolyzate and kinetic analyses, typical degradation mechanisms of Sn-containing PLLA were clarified. In other words, it was assumed that the pyrolysis of PLLA-ap proceeds through a zero-order weight loss process with the apparent Ea = 80-90 kJ mol-1, and with the occurrence of backbiting and transesterification reactions caused by Sn-alkoxide chain ends. The pyrolysis of PLLA-pr was also assumed to proceed via a zero-order weight loss process with apparent Ea = 120-130 kJ mol-1, with the proposed mechanism being Sn-catalyzed selective lactide elimination caused by Sn-carboxylate chain ends. Both pyrolysis of PLLA-ap and PLLA-pr produced L,L-lactide selectively. These degradation mechanisms and products are in contrast to those of PLLA-H, in which a large amount of diastereoisomers and cyclic oligomers were formed by random degradation. From this study, the complicated PLLA pyrolysis behavior as reported previously could be explained properly.},
 pages = {243--251},
 title = {Effects of Chain End Structures on Pyrolysis of Poly(L-lactic acid) Containing Tin Atoms},
 volume = {84},
 year = {2004},
 yomi = {ニシダ, ハルオ and シライ, ヨシヒト and エンドウ, タケシ}
}