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Development of Polylactic Acid (PLA)...

Albahr, Zeyad.

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Development of Polylactic Acid (PLA)-Based Nanocomposite Films for Smart Food Packaging Applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development of Polylactic Acid (PLA)-Based Nanocomposite Films for Smart Food Packaging Applications./
作者:	Albahr, Zeyad.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	69 p.
附註:	Source: Masters Abstracts International, Volume: 80-06.
Contained By:	Masters Abstracts International80-06.
標題:	Agricultural engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10980948
ISBN:	9780438711549

Development of Polylactic Acid (PLA)-Based Nanocomposite Films for Smart Food Packaging Applications.
Albahr, Zeyad.

Development of Polylactic Acid (PLA)-Based Nanocomposite Films for Smart Food Packaging Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 69 p.

Source: Masters Abstracts International, Volume: 80-06.

Thesis (M.S.)--South Dakota State University, 2018.

This item must not be added to any third party search indexes.

Most of current food packaging resources are non-renewable and non- biodegradable. The use of these materials has resulted in serious environmental issues. In recent years, the recognition of waste disposal problems and their impacts on the environment has risen the demand for packaging manufactured from renewable materials. However, there are some limitations of using biopolymers for food packaging applications. These limitations include unreliable mechanical and barrier properties. These issues may be addressed by combining biopolymers and nanotechnologies. Nanotechnologies are expected to improve the performance of biopolymer-based packaging materials for food packaging applications. Cellulose nanocrystals (CNC) has shown a potential to be implemented as filler to reinforce synthetic polymer for food packaging applications, equating its unique attributes of biodegradability high surface area. In this work, the aim is to develop a friendly environmental nanocomposite film based on combination of polylactic acid (PLA) and CNC for food packaging applications using a solvent casting method. The main problem that restricts the utilization of nanocellulose as a reinforcing filler with hydrophobic polymers is their tendency to aggregate in the polymer matrix. Thus, a homogenization process was applied to the mixture in order to obtain an even dispersion of CNC in the PLA matrix. Three various internal mixtures at CNC content were used to prepare the nanocomposite films, which are 1,3,5 wt%. The prepared nanocomposite films were subjected to morphological analysis, tensile strength, water vapor, and moisture uptake tests. These tests were conducted to test CNC impact on the barrier and mechanical properties of the PLA matrix. The results of scanning electron microscope (SEM) images showed an appropriate dispersion of CNC at low concentration 1% and 3%, while aggregations of CNC were observed in the PLA matrix for the film containing 5%CNC. The tensile strength of the nanocomposite films significantly improved only with the film containing 3% of CNC by 40% compared to the control sample. The water vapor test conducted on the prepared films reviled an improvement of water vapor behavior of the film containing 3%CNC and 5%CNC by 20% and 42% respectively. The water uptake test reviled that the water sensitivity of the nanocomposite films increased with the presence of CNC at different contents (1%,3% 5%) in the PLA matrix. The obtained results from this study indicated that the prepared nanocomposite films presented relatively reliable tensile strength and water permeability compared to the pure PLA film. The improvement of the water permeability and the tensile strength showed a potential of the prepared nanocomposite films to be utilized in food packaging applications. However, further studies on the nanocomposite films properties required to confirm that.

ISBN: 9780438711549Subjects--Topical Terms:

3168406
Agricultural engineering.

Development of Polylactic Acid (PLA)-Based Nanocomposite Films for Smart Food Packaging Applications.
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500 $a Source: Masters Abstracts International, Volume: 80-06.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Wei, Lin.
502 $a Thesis (M.S.)--South Dakota State University, 2018.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Most of current food packaging resources are non-renewable and non- biodegradable. The use of these materials has resulted in serious environmental issues. In recent years, the recognition of waste disposal problems and their impacts on the environment has risen the demand for packaging manufactured from renewable materials. However, there are some limitations of using biopolymers for food packaging applications. These limitations include unreliable mechanical and barrier properties. These issues may be addressed by combining biopolymers and nanotechnologies. Nanotechnologies are expected to improve the performance of biopolymer-based packaging materials for food packaging applications. Cellulose nanocrystals (CNC) has shown a potential to be implemented as filler to reinforce synthetic polymer for food packaging applications, equating its unique attributes of biodegradability high surface area. In this work, the aim is to develop a friendly environmental nanocomposite film based on combination of polylactic acid (PLA) and CNC for food packaging applications using a solvent casting method. The main problem that restricts the utilization of nanocellulose as a reinforcing filler with hydrophobic polymers is their tendency to aggregate in the polymer matrix. Thus, a homogenization process was applied to the mixture in order to obtain an even dispersion of CNC in the PLA matrix. Three various internal mixtures at CNC content were used to prepare the nanocomposite films, which are 1,3,5 wt%. The prepared nanocomposite films were subjected to morphological analysis, tensile strength, water vapor, and moisture uptake tests. These tests were conducted to test CNC impact on the barrier and mechanical properties of the PLA matrix. The results of scanning electron microscope (SEM) images showed an appropriate dispersion of CNC at low concentration 1% and 3%, while aggregations of CNC were observed in the PLA matrix for the film containing 5%CNC. The tensile strength of the nanocomposite films significantly improved only with the film containing 3% of CNC by 40% compared to the control sample. The water vapor test conducted on the prepared films reviled an improvement of water vapor behavior of the film containing 3%CNC and 5%CNC by 20% and 42% respectively. The water uptake test reviled that the water sensitivity of the nanocomposite films increased with the presence of CNC at different contents (1%,3% 5%) in the PLA matrix. The obtained results from this study indicated that the prepared nanocomposite films presented relatively reliable tensile strength and water permeability compared to the pure PLA film. The improvement of the water permeability and the tensile strength showed a potential of the prepared nanocomposite films to be utilized in food packaging applications. However, further studies on the nanocomposite films properties required to confirm that.
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