Conformation of cyclic vs linear polylactide in solution
Polymers with their end groups joined together are known as cyclic polymers, and this lack of free end groups provides different physical properties to linear polymers. Due to synthetic difficulties up until recently, the physical conformations that these polymers adopt (along with the ways in which they relax stress) are thought to be unique but have yet to be fully defined. There is an array of publications regarding this matter, but many have opposing conclusions and the topic remains quite open. We would like to use SANS experiments to probe the physical nature of cyclic poly(lactide) (cPLA) samples in solution with an emphasis on the physical conformations compared to linear counterparts. We have cPLA samples ranging from 18,000 to over 100,000 g mol-1 in molecular weight, allowing for an in-depth study. PLA is one of the most promising bio-based and biodegradable polymers having seen substantial commercial attention and use in biomedical applications. Experiments on PLA samples would be useful for the advancement of cyclic polymers and of bio-based polymers, given that the unique properties of the former have the potential to aide in the commercialisation of the latter.
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Karen J Edler; BATHKE Elly Kim; DAVIDSON Matthew G.; LEAMAN Niamh; MATSARSKAIA Olga; SCHWEINS Ralf and YANG Philip. (2021). Conformation of cyclic vs linear polylactide in solution. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2065
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