UiO-66 (Zr) chitosanpolyvinyl alcohol composite films for controlled relearse of 1-naphthaleneacetic acid

Name: Nannapat Kaewnukulkit

LCSH: Kasetsart University -- Theses. M.Eng. (Sustainable energy and resources Engineering) 2020

Classification :.LCCS: TA418.9.C6

LCSH: Kasetsart University. -- Faculty of Engineering -- Theses

LCSH: Composite materials

LCSH: Naphthaleneacetic acid

LCSH: polyvinyl alcohol

LCSH: Chitosan

LCSH: Metal-organic frameworks

Abstract: 1-Naphthaleneacetic acid (1-NAA) is commonly used in horticulture crops to improve fruit quantity and quality of many fruit trees and it plays a critical role in adventitious root formation. However, high concentration of 1-NAA can inhibit plant growth and affect human health. To minimize the adverse effect of using 1-NAA, we introduce UiO-66(Zr)/chitosan/polyvinyl alcohol composite films to improve the performance in controlled release of 1-NAA. Among the films, UiO66(Zr)/chitosan with ratio of 8/32 (MOF8 film) could absorb 1-NAA at 11.29±4.27 mg/g after 60 minutes and revealed an effective slow release of 1-NAA at 30.48±9.25% after 15 days of experimental period. This was significantly slower than that of the pure chitosan film by ~2.3 times. This improvement was likely caused by (i) the interactions through π-π interactions between 1-NAA and the organic ligands in UiO-66(Zr) structure and (ii) the electrostatic attraction of NH3 + in chitosan with negatively charged 1-NAA enabling high loading efficiency of 1-NAA. The properties of composite films were investigated through thermal stability, water absorption capacity, and tensile strength. It was found that MOF8 film showed high maximum thermal stability up to 325 °C and highest swelling degree of 410.03±122.34%. Mechanical property of MOF8 film was found closed to that of a polyethylene grafting tape in a market. In conclusion, the developed composite films showed effectiveness in slow release of 1-NAA and it could be used in wide range of agricultural applications.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Songwut Suramitr

Role: Thesis Advisor

Name: Panida Prompinit

Role: Thesis CO-Advisor

Created: 2020

Modified: 2025-07-10

Issued: 2025-07-10

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/nannapat-kae-all.pdf

CallNumber: TA418.9.C6 .N39

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Sustainable energy and resources Engineering

Grantor: Kasetsart University

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