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Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends

Master of Science in Biosystems Engineering

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Bibliographic Details
Main Author: Nurul Hani, Md Zubir
Other Authors: Sam Sung, Ting, Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2016
Subjects:
Fibers
Polyethylene
Polylactic acid
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77897
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spelling my.unimap-778972023-04-04T02:03:49Z Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends Nurul Hani, Md Zubir Sam Sung, Ting, Dr. Fibers Polyethylene Polylactic acid Master of Science in Biosystems Engineering Biodegradable polymer is one of the alternatives that have potential to overcome serious environmental problem and depletion of crude oil. The materials that have been used in this study are polylactid acid (PLA), polyhydroxybutyrate-valerate (PHBV), rice straw (RS) fiber and polyethylene glycol (PEG). PLA and PHBV are one of biopolymer that can complement each other properties. The mixing process of these composites was carried out using heated two-roll mill (DW5110). The blends between PLA and PHBV slightly reduced tensile strength but increased Eb. Besides, it also increased the Young’s modulus. The optimum ratio of the blends is 50% PLA with 50% PHBV. This study also focused on the effect of RS fiber and PEG as plasticizer on PLA/PHBV blends. The RS fiber content was varied from 5 to 25 wt%. 5 wt% PEG based on RS fiber content was added. The addition of RS fiber into the blends reduced the mechanical properties and thermal stability however the water absorption increased. The incompatibility of RS fiber with PLA/ PHBV blends was proven by SEM micrographs. PLA/PHBV blends show high modulus and high tensile strength but it is quite brittle. . The goal of adding plasticizer to PLA/ PHBV blend with RS fiber is to enhance the polymer elongation and to reduce the brittleness while maintaining optimum polymer strength and stiffness. After the addition of PEG, the tensile strength reduced, while the Eb and Young modulus increased. The amphiphilic properties of PEG slightly reduced the water absorption. From FTIR spectra, it can be seen that the presence of PEG into PLA/PBV blends filled with RS fiber reduced the –OH group intensity. Natural weathering and soil burial test until 6 months were performed to determine the biodegradability of the polymer and were confirmed by evaluating the mechanical, morphological, carbonyl index and crystallinity. The addition of RS fiber had reduced the mechanical strength but carbonyl index and crystallinity increased. The crack, pores and fungus colonization was shown in SEM micrograph, indicated that the biodegradation was more pronounced with the addition of RS fiber. The addition of PEG also helps to increase the degradability by increasing the surface area for microbial attack. In conclusion, the addition of RS fiber increased the degradability and the presence of PEG as plasticizer improved the Eb between the blends. 2016 2023-02-21T06:49:24Z 2023-02-21T06:49:24Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77897 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Bioprocess Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Fibers
Polyethylene
Polylactic acid
spellingShingle Fibers
Polyethylene
Polylactic acid
Nurul Hani, Md Zubir
Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
description Master of Science in Biosystems Engineering
author2 Sam Sung, Ting, Dr.
author_facet Sam Sung, Ting, Dr.
Nurul Hani, Md Zubir
format Thesis
author Nurul Hani, Md Zubir
author_sort Nurul Hani, Md Zubir
title Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
title_short Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
title_full Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
title_fullStr Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
title_full_unstemmed Effect of rice straw fiber and Polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
title_sort effect of rice straw fiber and polyethylene glycol on polylactic acid/polyhydroxybutyrate-valerate blends
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2016
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77897
_version_ 1772813065443606528
score 13.214268

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