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Additive Effects of Lithium Salts with Various Anionic Species in Poly (Methyl Methacrylate).

ABSTRACT: We report that lithium salts in lithium-ion batteries effectively modify the physical properties of poly (methyl methacrylate) (PMMA). The glass transition temperature (Tg) is an indicator of the heat resistance of amorphous polymers. The anionic species of the salts strongly affected the glass transition behavior of PMMA. We focused on the additive effects of various lithium salts, such as LiCF3SO3, LiCOOCF3, LiClO4, and LiBr, on the Tg of PMMA. The large anions of the former three salts caused them to form macroscopic aggregates that acted as fillers in the PMMA matrix and to combine the PMMA domains, increasing Tg. On the other hand, LiBr salts dispersed microscopically in the PMMA matrix at the molecular scale, leading to the linking of the PMMA chains. Thus, the addition of LiBr to PMMA increased Tg as well as the relaxation time in the range of glass to rubber transition.

SUBMITTER: Ito A

PROVIDER: S-EPMC8271803 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Additive Effects of Lithium Salts with Various Anionic Species in Poly (Methyl Methacrylate).

Ito Asae A Nitta Koh-Hei KH

Molecules (Basel, Switzerland) 20210705 13

We report that lithium salts in lithium-ion batteries effectively modify the physical properties of poly (methyl methacrylate) (PMMA). The glass transition temperature (Tg) is an indicator of the heat resistance of amorphous polymers. The anionic species of the salts strongly affected the glass transition behavior of PMMA. We focused on the additive effects of various lithium salts, such as LiCF3SO3, LiCOOCF3, LiClO4, and LiBr, ...[more]

PMID: 34279435

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Project description:Amphiphilic statistical copolymers can be utilized for the formulation of nanocarriers for the drug delivery of insoluble substances. Oligoethylene glycol methylether methacrylate and methyl methacrylate are two biocompatible monomers that can be used for biological applications. In this work, the synthesis of linear poly(oligoethylene glycol methylether methacrylate-co-methyl methacrylate), P(OEGMA-co-MMA), and statistical copolymers via reversible addition fragmentation chain transfer (RAFT) polymerization is reported. P(OEGMA-co-MMA) copolymers with different comonomer compositions were synthesized and characterized by size exclusion chromatography (SEC), 1H-NMR, and ATR-FTIR spectroscopy. Self-assembly studies were carried out by the dissolution of polymers in water and via the co-solvent protocol. For the characterization of the formed nanoaggregates, DLS, zeta potential, and fluorescence spectroscopy (FS) experiments were performed. Such measurements delineate the association of copolymers into aggregates with structural characteristics dependent on copolymer composition. In order to investigate the drug encapsulation properties of the formed nanoparticles, curcumin and quercetin were loaded into them. The co-solvent protocol was followed for the encapsulation of varying concentrations of the two drugs. Nanocarrier formulation properties were confirmed by DLS while UV-Vis and FS experiments revealed the encapsulation loading and the optical properties of the drug-loaded nanosystems in each case. The maximum encapsulation efficiency was found to be 54% for curcumin and 49% for quercetin. For all nanocarriers, preliminary qualitive biocompatibility studies were conducted by the addition of FBS medium in the copolymer aqueous solutions which resulted in no significant interactions between copolymer aggregates and serum proteins. Novel nanocarriers of curcumin and quercetin were fabricated as a first step for the utilization of these statistical copolymer nanosystems in nanomedicine.

Dataset Information

Additive Effects of Lithium Salts with Various Anionic Species in Poly (Methyl Methacrylate).

Publications

Additive Effects of Lithium Salts with Various Anionic Species in Poly (Methyl Methacrylate).

Similar Datasets

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