Fabrication of biodegradable composite hydrogels based on cassava starch (Cst)-grafted-polyacrylamide (PAM)/natural rubber (NR)/montmorillonite (MMT) as coating membrane for slow-release fertilizers

การเตรียมไฮโดรเจลคอมโพสิทที่ย่อยสลายได้ทางธรรมชาติจากแป้งมันสำปะหลังกราฟด้วยพอลิอะไครลาไมด์/ยางธรรมชาติ/มอนต์มอริลโลไนต์ เพื่อใช้เป็นสารเคลือบสำหรับปุ๋ยปลดปล่อยช้า

Name: Punnapat Jumpapaeng

keyword: Hydrogels

LCSH: Biodegradation

Classification :.LCCS: TP

LCSH: Polyacrylamide

LCSH: Montmorillonite

LCSH: Rubber

Abstract: Biodegradable hydrogels (BHs) from cassava starch (Cst), natural rubber (NR), and montmorillonite (MMT) Cst-g-PAM/NR/MMT were synthesized by free radical polymerization as coating membrane materials for a slow-release fertilizer hydrogel (SRFHs). The MMT content varied between 0, 3, 5 and 10% wt. The results revealed that water swelling ratio rates of the resulting hydrogels (Cst-g-PAM/NR/MMT) increased when the montmorillonite content was increased from 0-3 wt% and thereafter significantly decreased with the addition of 5 wt% of MMT. Moreover, it was found that the thermal resistance and biodegradability properties of hydrogels tended to increase when increasing the amount of montmorillonite (MMT) from 0-10 wt%. The XRD patterns revealed that the hydrogels were semi-crystalline in nature, and peaks of MMT in the Cst-g-PAM/NR/MMT hydrogels appeared at 20.05, 29.54, 33.34, 35.75, and 54.22°. The tensile strength of the Cst-g-PAM/NR/MMT composite hydrogels increased dramatically by increasing MMT content, but elasticity also rapidly decreased simultaneously. As a result of the liquid fertilizer release test, it was found that the release rate of pure urea fertilizer was almost completely discharged (99.59 percent) in just 3 hours, while the hydrogel-coated urea fertilizer FWBHM0 FWBHM3 FWBHM5 and FWBHM10 formulations had release rates of 98.76%, 93.83%, 90.35%, and

Ubon Ratchathani University. The Office of Academic Resources

Address: UBON RATCHATHANI

Email: library@ubu.ac.th

Name: Sayant Saengsuwan

Role: Advisor

Created: 2022

Modified: 2567-10-05

Issued: 2024-10-05

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: TP P984 2022

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Major in Chemistry

Grantor: Ubon Ratchathani University

©copyrights Ubon Ratchathani University

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