Synthesis and characterization of plant-derived compounds modified poly(lactic acid) and polymeric nanogels as additives for packaging applications

Name: Saowaluk Taechutrakul.

LCSH: Kasetsart University -- Dissertations. Ph.D. (Nanomaterials Science) 2023.

Classification :.LCCS: TS198.2

LCSH: Kasetsart University. -- Department of Materials Science -- Dissertations.

LCSH: Packaging -- Materials.

LCSH: Wrapping materials.

Abstract: The thesis work consists of two main developments of packaging and printing materials, i.e., i) plant-derived compounds modified polylactic acid and ii) polymeric nanogels as additive in ink formula. The 1st part studied the development of active film strips to extend the shelf life of fruits: Multibranched PLA-gallic acid as an antioxidant/oxygen scavenger in a case study of bananas (Musa AAA group). The 2nd part focused on nanogels-based ink prepared using electron beamsynthesized poly(vinyl pyrrolidone) nanogels as pigment dispersing and stabilizing agent. For the 1st part, the original research proposed the development of active polylactic acid (PLA) film strips for use inside food packaging to extend the shelflife of bananas (Musa AAA group). Multibranched PLA functionalized with gallic acid (GA) (mPLA-GA) was prepared by ring-opening polymerization and functionalization. mPLA-GA was compounded with PLA and fabricated into PLA/mPLA-GA film strips by melt processing using different mPLA-GA contents. The morphology, antioxidant activity, free-radical scavenging ability under a radiation sterilization dose, migration behavior, mechanical properties, and O2 scavenging capacity of PLA/mPLA-GA film strips were determined and compared with neat PLA and PLA/GA film strips. The results suggest that PLA/mPLA-GA film strips show promise as an active bioplastic for extending the shelf-life of bananas as well as other fruits and food items. For the 2nd part, dispersion and stabilization of water-insoluble organic pigment particles using nanogels in water-based inks is a progress opportunity for organic printing ink technology. This work proposes poly(vinyl pyrrolidone) (PVP) nanogels as a nano-structured particle “bumper” for dispersing, wetting, and stabilizing the pigment particles to protect them from flocculation. The expected satisfactory dispersion and stabilization reflects not only quality of formulated ink, but also the finished printed object. This work provides a promising advancement in printing ink and coating technologies due to employing the polymeric nanogels as dispersing, wetting, and stabilizing nanoplatform

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Wanvimol Pasanphan

Role: Thesis Advisor

Created: 2023

Modified: 2025-06-25

Issued: 2025-06-25

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/saowaluk-tae-all.pdf

CallNumber: TS198.2.S26

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Nanomaterials Science

Grantor: Kasetsart University

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