Thermal, antioxidant and swelling behaviour of transparent polyvinyl (alcohol) films in presence of hydrophobic citric acid-modified lignin nanoparticles

Xiaoyan He; Francesca Luzi; Xiaolong Hao; Weijun Yang; Luigi Torre; Zefang Xiao; Yanjun Xie; Debora Puglia

doi:10.1016/j.ijbiomac.2019.01.202

Thermal, antioxidant and swelling behaviour of transparent polyvinyl (alcohol) films in presence of hydrophobic citric acid-modified lignin nanoparticles

Int J Biol Macromol. 2019 Apr 15:127:665-676. doi: 10.1016/j.ijbiomac.2019.01.202. Epub 2019 Jan 30.

Authors

Xiaoyan He¹, Francesca Luzi², Xiaolong Hao³, Weijun Yang⁴, Luigi Torre², Zefang Xiao³, Yanjun Xie³, Debora Puglia⁵

Affiliations

¹ Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 26 Hexing Road, Harbin 150040, People's Republic of China; University of Perugia, Department of Civil and Environmental Engineering, Materials Engineering Center, UdR INSTM, Strada di Pentima 4, Terni, Italy.
² University of Perugia, Department of Civil and Environmental Engineering, Materials Engineering Center, UdR INSTM, Strada di Pentima 4, Terni, Italy.
³ Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University, 26 Hexing Road, Harbin 150040, People's Republic of China.
⁴ School of Chemistry and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi 214122, People's Republic of China.
⁵ University of Perugia, Department of Civil and Environmental Engineering, Materials Engineering Center, UdR INSTM, Strada di Pentima 4, Terni, Italy. Electronic address: debora.puglia@unipg.it.

PMID: 30710589
DOI: 10.1016/j.ijbiomac.2019.01.202

Abstract

Lignin nanoparticles (LNP) have been esterified and etherified by citric acid and then blended with poly (vinyl alcohol) (PVA) at various loading levels (up to 10 wt%). Poly(vinyl alcohol) nanocomposite films containing unmodified and modified lignin nanoparticles (LNP and MLNP) were prepared through solvent casting approach. Microscopic investigation of films fractured surfaces confirmed that MLNP could be evenly dispersed in PVA matrix, and no macroscopic phase separation was generated in the nanocomposite films. Water contact angle, swelling efficiency and moisture adsorption properties of LNP and MLNP based films were measured and compared, revealing an overall increase of dimensional stability and reduced moisture adsorption for MLNP nanocomposites. MLNP based nanocomposite films outperformed the films containing LNP in antioxidant property and transparency, slight sacrificing in UV-absorbing, confirming these materials as promising candidates for applications requiring high antioxidant potential and improved performance towards light absorbance.

Keywords: Antioxidant property; Modified lignin nanoparticles; Nanocomposites; UV protection.

MeSH terms

Antioxidants / chemistry*
Citric Acid / chemistry*
Hydrophobic and Hydrophilic Interactions
Lignin / chemistry*
Membranes, Artificial*
Nanoparticles / chemistry*
Polyvinyl Alcohol / chemistry*

Substances

Antioxidants
Membranes, Artificial
Citric Acid
Polyvinyl Alcohol
Lignin