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Ren, Narath. Low-density polyethylene (LDPE) films with superhydrophobic and antimicrobial surfaces for smart greenhouse applications. Master's Degree(Engineering and Technology). Thammasat University. Thammasat University Library. : Thammasat University, 2020.
Low-density polyethylene (LDPE) films with superhydrophobic and antimicrobial surfaces for smart greenhouse applications
Name: Ren, Narath
keyword:
Low-density polyethylene
;
Chitosan
Abstract:
Low density polyethylene (LDPE) films have been widely used as greenhouse covering for smart agriculture, due to their good mechanical properties, low cost, and suitable optical property. The low hydrophobicity and lack of anti-microbial property of the films, however, cause their surfaces to be easily covered by microorganisms or dusts. This leads to a deterioration in light transmission of the films and microorganism contaminations. To overcome these problems, a process for surface modifications of LDPE films has been developed in this study. Chitosan (CS), alkyl ketone dimer (AKD), and glutaraldehyde (GA) were used as surface-coating agents for enhancements of hydrophobicity and anti-microbial properties property of LDPE films. To promote adhesion between the coating agents and the surface of inert LDPE films, a pre-treatment process is required to generate surface roughness and polar functional groups. This is achieved by treating with chromic acid solution at 75 "℃" for 30 min. CS was dissolved in acetic acid and then mixed with AKD in tetrahydrofuran (THF) at a AKD/CS mass ratio of 1:2 at 80"℃" for 1 h, with an addition of GA crosslinking agent for 10 min. The mixture was then coated on the acid-etched film by using a roller at different sizes. FTIR spectra showed that the newly-generated polar groups after the acid-etching step play a key role in improving the adhesion between LDPE and the coating agents. The chemical reactions between AKD and OH groups of CS was confirmed by a presence of a band at 1747cm-1 of the C=O stretching mode of "β" -ketoester linkages. With optimum conditions, LDPE films with a water contact angle of 121"°±" 2"°" were obtained, compared to that of original LDPE of 76"°± " 1"°" . The antibacterial activity of the modified films showed a strong ability against gram-positive. The resulting superhydrophobic films with a presence of CS on the surface have high potential for use in various applications, especially as greenhouse covering, food packaging, or pond covering
Thammasat University. Thammasat University Library
Address:
BANGKOK
Email:
preserv@tu.ac.th
Name: Pakorn Opaprakasit
Role:
advisor
Created:
2020
Modified:
2023-03-07
Issued:
2023-03-07
วิทยานิพนธ์/Thesis
application/pdf
eng
DegreeName: Master of Science
Level: Master's Degree
Descipline: Engineering and Technology
Grantor: Thammasat University
©copyrights Thammasat University
RightsAccess:
ใช้เวลา
0.033494 วินาที
Ren, Narath
| Title | Contributor | Type |
|---|---|---|
| Low-density polyethylene (LDPE) films with superhydrophobic and antimicrobial surfaces for smart greenhouse applications
มหาวิทยาลัยธรรมศาสตร์ Ren, Narath | Pakorn Opaprakasit | วิทยานิพนธ์/Thesis |
Pakorn Opaprakasit