Raman evaluation of the crystallinity degree and composition of poly(L-lactide-co-ε-caprolactone).

Autor: Liubimovskii SO; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia. Electronic address: liubimovskii@kapella.gpi.ru., Novikov VS; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia., Sagitova EA; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia., Kuznetsov SM; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia., Bakirov AV; Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya St. 70, 117393 Moscow, Russia; National Research Centre «Kurchatov Institute», Akademika Kurchatova Pl. 1, 123182 Moscow, Russia., Dmitryakov PV; National Research Centre «Kurchatov Institute», Akademika Kurchatova Pl. 1, 123182 Moscow, Russia., Sedush NG; Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya St. 70, 117393 Moscow, Russia; National Research Centre «Kurchatov Institute», Akademika Kurchatova Pl. 1, 123182 Moscow, Russia., Chvalun SN; Enikolopov Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences, Profsoyuznaya St. 70, 117393 Moscow, Russia; National Research Centre «Kurchatov Institute», Akademika Kurchatova Pl. 1, 123182 Moscow, Russia., Ustynyuk LY; Chemistry Department, M.V. Lomonosov Moscow State University, Leninskie Gory 1(3), 119991 Moscow, Russia., Kuzmin VV; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia., Vasimov DD; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia., Moskovskiy MN; Federal Scientific Agroengineering Center VIM, 1(st) Institutskiy Proezd 5, 109428 Moscow, Russia., Nikolaeva GY; Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov St. 38, 119991 Moscow, Russia.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2024 Apr 05; Vol. 310, pp. 123876. Date of Electronic Publication: 2024 Jan 17.
DOI: 10.1016/j.saa.2024.123876
Abstrakt: In this work, we study two series of the copolymers of L-lactide (LLA) and ε-caprolactone (CL) with the CL molar content of 5, 15, and 30 %. The first series was the commercial semicrystalline granules (Corbion, Netherlands), which we analyzed without any additional modification. The second series was amorphous films, prepared from the granules by hot pressing with the subsequent fast quenching in order to avoid the crystallization. We used Raman spectroscopy in conjunction with the quantum chemical modeling to evaluate the structure of the copolymers. As additional methods, we applied X-ray diffraction (XRD) analysis and differential scanning calorimetry (DSC). The main result of our study is the elaboration of the Raman methods of quantitative analysis of the relative contents of the comonomers and the crystallinity degree of the poly(L-lactide-co-ε-caprolactone). These methods are based on measurements of the ratios of the peak intensities of the poly(L-lactide) (PLLA) bands at 411 and 874 cm -1 , the PLLA band at 2947 cm -1 and the poly(ε-caprolactone) band at 2914 cm -1 . Raman study shows that growth of the CL content causes the monotonous decrease in the crystallinity degree of PLLA blocks. Density functional theory analysis of LLA decamer in the conformation of helix 10 3 allows us to assign the PLLA Raman bands. The Raman data on the composition and crystallinity degree of the copolymers correlate very well with the results of XRD and DSC studies, as well as with the information on the composition of the copolymers provided by manufacturer.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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