Fabrication of functional materials derived from poly(lactic acid) biopolymer composited with metal-organic frameworks (MOFs)

Name: Jirawan Jindakaew

keyword: Polylactic acid

; Metal-organic frameworks

; Biocomposite

; Casting film

; Gas permeability

; Solvent infusion

; Cold drawing

Abstract: This work is aimed to develop biocomposite materials from degradable polylactic acid (PLA) and metal-organic frameworks (MOFs) for use in various applications, such as active packaging. MIL-53(Al) MOF nanoparticles were synthesized by an environmentally friendly process, in water medium at room temperature, followed by a calcination post-treatment process. The nano-size materials are essential for applications that require homogenous mixing, especially packaging films. PLA/MIL-53(Al) composite films consisting of 0.5, 1.0 and 2.0 %wt MOF were prepared by a solution casting technique. SEM-EDX results reveal that the composite films contain homogeneous dispersed MIL-53(Al) particles in the PLA matrix. The percent transmittance of lights in the UV-A, UV-B, and violet visible regions of the PLA/MOFs composite films was reduced with an increase in the MOFs contents. Water vapor transmission rate (WVTR) was also decreased with an increase in the MOFs contents. Oxygen transmission rate (CTR) was presented the high performance at a 1.0 %wt MOF. In addition, carbon dioxide transmission rate (OTR) was increased when MOF was introduced, especially at a 0.5 wt% MOF content. The biocomposite films have high potential for use as functional and active packaging, which are friendly to the environment. In addition, electrospun nanofibers of neat PLA and PLA/MOFs composites were prepared by using binary solvent systems of AC/DMF and AC/CHL. The composites nanofibers showed improvements of a hydrophobic property of the surfaces. A significantly modification occurred as rough surface patterns, which may be responsible for the super-hydrophobicity of the materials. Post treatments of polymer products after fabrication, especially improving chain crystallization, are commonly applied to further enhance properties of the products. In this study, a solvent-infusion cold drawing process for poly(L-lactic acid) (PLLA) filaments are developed, and its mechanisms is examined. Multiple necking behavior was observed when the filaments were drawn in water and ethanol, compared to a single-neck deformation when the experiment was conducted in air. The number of necks was also dependent on the drawing conditions, in which the number of necks decreased with an increase in the draw ratio (DR). With a further increase in the drawing speed, the number of necks of the filaments drawn in water and ethanol increased. The drawing treatments in water and ethanol lead to a decrease in the drawing stresses on the filaments. The results also indicate that ethanol is effectively infused into the PLLA filaments, leading to further chain arrangement. The process has high potential for promoting the filament’s crystallization at room temperature conditions

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Pakorn Opaprakasit

Role: advisor

Name: Chalita Ratanatawanate

Role: co-advisor

Created: 2020

Modified: 2022-11-07

Issued: 2022-11-07

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2020.86

eng

Level: Master's Degree

Descipline: Engineering Technology

Grantor: Thammasat University

DegreeName: Master of Engineering

©copyrights Thammasat University

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