Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Differences in Residual Behavior of a Bumetrizole Type Ultraviolet Light Absorber during Formation of Various Microplastics

Hisayuki NAKATANI
* ORCID logo ,
Taishi UCHIYAMA
,
Suguru MOTOKUCHO
,
Anh Thi Ngoc DAO
,
Hee-Jin KIM
,
Mitsuharu YAGI
ORCID logo ,
Yusaku Kyozuka
ORCID logo
Version 1 : Received: 27 December 2023 / Approved: 27 December 2023 / Online: 27 December 2023 (14:19:16 CET)

A peer-reviewed article of this Preprint also exists.

Nakatani, H.; Uchiyama, T.; Motokucho, S.; Dao, A.T.N.; Kim, H.-J.; Yagi, M.; Kyozuka, Y. Differences in the Residual Behavior of a Bumetrizole-Type Ultraviolet Light Absorber during the Degradation of Various Polymers. Polymers 2024, 16, 293. Nakatani, H.; Uchiyama, T.; Motokucho, S.; Dao, A.T.N.; Kim, H.-J.; Yagi, M.; Kyozuka, Y. Differences in the Residual Behavior of a Bumetrizole-Type Ultraviolet Light Absorber during the Degradation of Various Polymers. Polymers 2024, 16, 293.

Abstract

Quality-changed behavior of ultraviolet light absorber (UVA: UV-326) in polymers (PP, HDPE, LDPE, PLA and PS) over time during degradation was studied with an enhanced degradation method (EDM) using sulfate ion radical in seawater. EDM was employed to homogeneously degrade the entire polymer samples containing the UVA. The PP and PS samples containing 5-phr UVA films whitened rapidly due to formation of numerous grooves or crushed particles. The UVA loss rate of PS with the higher Tg was much slower. The crystalline polymers, with the exception of PS, were similar in the behavior of the change in UVA loss rate with respect to degradation time. The significant increase in initial loss rate observed during EDM degradation was due to microplasticization. A similar increase in microplasticization rate occurred with the PS, but the intermolecular interaction between UVA and PS did not result in as pronounced its increase in loss rate as with other polymers. The UVA chemical structure was not altered by EDM degradation. These results revealed that the UVA leaching from the polymer matrix was the primary cause of the loss.

Keywords

microplastics; ultraviolet light absorber; bleaching; polypropylene; polystyrene; polyethylene

Subject

Chemistry and Materials Science, Polymers and Plastics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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