Improved heat resistance properties of poly(l-lactide)/basalt fiber biocomposites with high crystallinity under forming hybrid-crystalline morphology

Hongwei Pan; Junjun Kong; Yunjing Chen; Huiliang Zhang; Lisong Dong

doi:10.1016/j.ijbiomac.2018.10.178

Improved heat resistance properties of poly(l-lactide)/basalt fiber biocomposites with high crystallinity under forming hybrid-crystalline morphology

Int J Biol Macromol. 2019 Feb 1:122:848-856. doi: 10.1016/j.ijbiomac.2018.10.178. Epub 2018 Oct 26.

Authors

Hongwei Pan¹, Junjun Kong¹, Yunjing Chen², Huiliang Zhang³, Lisong Dong⁴

Affiliations

¹ Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, PR China; University of Chinese Academy of Sciences, No. 19A Yuquanlu, Beijing 100049, PR China.
² Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, PR China; University of Science and Technology of China, Hefei 230026, PR China.
³ Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, PR China. Electronic address: hlzhang@ciac.ac.cn.
⁴ Key Laboratory of Polymer Ecomaterials, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022, PR China. Electronic address: dongls@ciac.ac.cn.

PMID: 30420337
DOI: 10.1016/j.ijbiomac.2018.10.178

Abstract

In this work, the heat resistance and thermomechanical properties of biodegradable poly(l‑lactide) (PLLA) was improved greatly by using short basalt fibers (SBF). The heat deformation temperature (HDT) of PLLA/SBF composites was markedly improved from 62.5 to158.8 °C when its crystallinity was increased from 44.3% to 67.7% after appropriate thermal treatment. Fibers reinforcement and interface crystalline morphology were the two important reasons for the change of in heat deformation and storage modulus of PLLA before and after crystallization. Polarized optical microscopy (POM) demonstrated that the transcrystalline and shish-kebab were successfully induced by SBF, and the "crystalline-network" structure was formed in the composites after isothermal treatment. The PLLA/SBF composites with the formation of interface crystalline had a significantly higher overall heat resistance compared with the common PLLA. As the scanning electron microscope (SEM) analysis, the low values of impact strength might be due to the presence of large spherulites cracks and weak interfacial adhesion.

Keywords: Basalt fibers; Heat resistance; Poly(l‑lactic acid) (PLLA).

MeSH terms

Crystallization
Hot Temperature*
Materials Testing
Mechanical Phenomena*
Polyesters / chemistry*
Silicates / chemistry*

Substances

Polyesters
Silicates
basalt
poly(lactide)