Preparation of ODA⁃TA@L⁃CNC and its effect on multifunctional PLA composite films

doi:10.19491/j.issn.1001-9278.2023.12.003

Abstract

Abstract:

Lignocellulosic nanocrystals （L⁃CNC） were prepared by using bamboo residue as a raw material and then modified by grafting octadecylamine （ODA） onto their surfaces through utilizing the chemical reactivity of catechol groups in tannic acid （TA）. A series of composite films based on modified L⁃CNC and poly（lactic acid）（PLA） were prepared through solution casting. The effect of L⁃CNC content on the mechanical， antioxidant， UV shielding， and hydrophobic properties of the composite films were investigated. The results indicated that the grafting modification of ODA improved the compatibility of L⁃CNC with PLA. When the content of ODA⁃TA@L⁃CNC was 1 wt %， The composite films showed elongation at break of 20.42 % and fracture toughness of 8.55 MJ/m³， which were 3 times and 10 times higher than those of neat PLA film， respectively. Meanwhile， their tensile strength was increased to 46.84 MPa， and their hydrophobic performance was significantly improved with a stable contact angle of about 100° within 1 minute. When the content of ODA⁃TA@L⁃CNC was 1.5 wt %， the composite films obtained a free radical scavenging rate of 49.30 % for DPPH， indicating a good antioxidant property. They also gained an average blocking ratio of 44.81 % in the wavelength range of the ultraviolet region. This means that the composite films can shield most of the UVB spectrum （280~320 nm）.

Key words: poly（lactic acid）, lignocellulosic nanocrystals, tannic acid, octadecylamine, composite film

CLC Number:

TQ321.5

SUN Zijia, LUO Cuimei, WANG Qihang, WANG Xujie, MU Jun. Preparation of ODA⁃TA@L⁃CNC and its effect on multifunctional PLA composite films[J]. China Plastics, 2023, 37(12): 14-22.

Figures/Tables 12

薄膜编号	PLA 质量/g	L⁃CNC 质量/g	ODA⁃TA@ L⁃CNC质量/g
PLA	8.00	0	0
0.5% L⁃CNC/PLA	7.96	0.04	-
1% L⁃CNC/PLA	7.92	0.08	-
1.5% L⁃CNC/PLA	7.88	0.12	-
0.5% ODA⁃TA@L⁃CNC/PLA	7.96	-	0.04
1% ODA⁃TA@L⁃CNC/PLA	7.92	-	0.08
1.5% ODA⁃TA@L⁃CNC/PLA	7.88	-	0.12

Tab.1. Film composition ratio

Fig.1. Flow chart of preparation of ODA⁃TA@L⁃CNC and enhanced PLA composite films

Fig.2. AFM images and size distribution of L⁃CNC before and after modification

Fig.3. FTIR spectra of L⁃CNC before and after modification

Fig.4. XPS spectra of L⁃CNC before and after modification

Fig.5. Heat resistance of L⁃CNC before and after modification

Fig.6. Mechanical properties of neat PLA and modified composite films

Fig.7. Tensile fracture surfaces of neat PLA and modified composite films

Fig.8. Antioxidant activity of neat PLA and modified films

Fig.9. UV barrier property of neat PLA and modified composite films

Fig.10. Hydrophobic property of neat PLA and modified composite films

Fig.11. Schematic diagram of action mechanism between ODA⁃TA@L⁃CNC and PLA

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