Effect of synthesized sulfonate derivatives as nucleating agents on crystallization behavior of poly(lactic acid)

Pasawat Jongpanya-Ngam; Rattikarn Khankrua; Manus Seadan; Supakij Suttiruengwong

doi:10.1080/15685551.2022.2072697

Effect of synthesized sulfonate derivatives as nucleating agents on crystallization behavior of poly(lactic acid)

Des Monomers Polym. 2022 May 6;25(1):115-127. doi: 10.1080/15685551.2022.2072697. eCollection 2022.

Authors

Pasawat Jongpanya-Ngam¹, Rattikarn Khankrua², Manus Seadan³, Supakij Suttiruengwong¹

Affiliations

¹ Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom, Thailand.
² Department of Materials Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin, Nakhon Pathom, Thailand.
³ Department of Physics, Faculty of Science, Silpakorn University, Nakhon Pathom, Thailand.

Abstract

The improvement of the crystallization of poly(lactic acid) (PLA) is one of the key areas to allow PLA to perform better at higher temperature and load bearing. Due to its slow crystallization rate, either organic or inorganic nucleating agents (NAs) can be used to improve the crystallization rate of PLA. In the case of organic NAs, aromatic sulfonate salt and bisamide compounds are promising ones because they can control better clarity. The aim of this work was to study the crystallization behavior of PLA using as-synthesized dimethyl 5-sulfoisophthalate sodium salt (SSIPA) as a nucleating agent in comparison with the commercial sulfonate salt (LAK-301). Two grades of PLA (PLA L105 and PLA 3251D) were used in this study. PLA samples were prepared by internal mixer and compression molding. All samples were investigated by DSC and POM. The results from DSC showed that after introducing the nucleating agents into PLA, the crystallinity in all samples was improved. The highest crystallinity at 57.48% was obtained from PLA L105/SSIPA1.0. Isothermal crystallization kinetics showed the improvement in overall crystallization rate of PLA with nucleating agents. The lowest half time crystallization obtained was 1.19 min for PLA L105/SSIPA1.0 at 135 °C. The results from POM indicated the substantial increase of the nucleus density and smaller spherulite size upon adding nucleating agents.

Keywords: Poly (lactic acid); aromatic sulfonate; crystallization; nucleating agent; transparency.

Grants and funding

This research was financially supported by Department of Materials Science and Engineering, Faculty of Engineering and Industrial Technology. PLA L105 resin and LAK-301 were kindly donated from Total Corbion PLA, CO. Ltd. (Thailand). The authors acknowledge Mr. Pongsakorn Nuchanong for assisting some experimental analysis.