Dissertation summary Organic chemistry: Study on the manufacturing and properties of gas barrier multilayers films and applications

Objectives of the dissertation: Researching and fabricating gas barrier multilayer films based on the polyme blends and exploring the applicability of packaging to preserve dry agricultural products.
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Dissertation summary Organic chemistry: Study on the manufacturing and properties of gas barrier multilayers films and applications MINISTERY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ------------- NGUYEN TUAN NAM STUDY ON THE MANUFACTURING AND PROPERTIES OF GAS BARRIER MULTILAYERS FILMS AND APPLICATIONS Scientific Field: Organic Chemistry Classification Code: 62 44 01 14 DISSERTATION SUMMARY HA NOI - 2020 The dissertation was completed at: Institute of Chemistry Vietnam Academy of Science and Technology Scientific Supervisors: 1. Dr. Nguyen Tien Dung The Faculty of Chemistry – Hanoi National University of Education 2. Dr. Nguyen Thanh Tung Institute of Chemistry - Vietnam Academy of Science and Technology 1st Reviewer: ........................................................................... ................................................................................. ................................................................................. 2nd Reviewer: .......................................................................... ................................................................................. ................................................................................. 3rd Reviewer: ........................................................................... ................................................................................. ................................................................................. The dissertation will be defended at Graduate University of Science And Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay District, Ha Noi City. At ….. hour….. date….. month …..2020. The dissertation can be found in National Library of Vietnam and the library of Graduate University of Science And Technology, Vietnam Academy of Science and Technology. 1 A. INTRODUCTION 1. Background Packaging plays an important role in the food supply chain. They are not only used to store, preserve and transport products but also used as a marketing tool to bring added value to the product. Packaging protects food from environmental influences such as oxygen, moisture, light, dust, volatile compounds and microorganisms [1], it acts as a barrier between the atmosphere around food and the outside environment. Oxygen and steam are the two main reasons leading to the deterioration of food quality. Therefore, the development of the gas barrier packaging products with low air and water vapor permeability is a research direction that has been interested recently. According to Smithers Pira, in 2015, the world consumed about 1.4 million tons of gas barrier packaging films, in 2016 it was 1.86 million tons, with the growth rate of 4.7%/year. The regions using the most gas barrier packaging films were Asia-Pacific with 30.9%, followed by Western Europe (27.6%) and North America (26.8%). Among the materials used for packaging, plastic in the form of thin films has many outstanding advantages compared to other packaging types such as: light, durable, elastic, transparent, resistant to air and vapor. High water, and at the same time have good heat sealing and sealing ability. Polyethylene (PE) is the most commonly used plastic for packaging thanks to its good moisture barrier, low cost, but poor resistance to O 2, aromas and essential oils. Like PE, PA6 has good moisture barrier but poor O2 and CO2 barrier. Therefore, the recent trend that scientists are most interested in developing is to combine these polymers with another polymer with high gas barrier ability in the form of polymer blends or multilayer films. The most widely used and highly gas barrier polymer is EVOH [2]. Combining EVOH with PE or PA6 can create a material that has both highly mechanical and good gas, solvent, and moisture resistance, suitable for applications requiring high gas barrier such as food packaging or dry agricultural packaging ... Agriculture plays an important role in Vietnam's economy with great developments. However, post-harvest losses of agricultural products are still high, from 15-20% for foods, the main reason is that the research, application and deployment of post-harvest technologies have not timely responded and are full of requirements. In the country, there are also studies on the use of gas barrier packaging to preserve dry food and agricultural products, but the gas barrier packaging products on the market today are all imported products with expensive prices. Stemming from the above problems, the thesis focuses on: Study on the manufacturing and properties of gas barrier multilayer films and applications. 2 2. Objectives of the dissertation Researching and fabricating gas barrier multilayer films based on the polyme blends and exploring the applicability of packaging to preserve dry agricultural products. 3. Main contents of the thesis - Study on fabrication and properties of some polymer blends based on EVOH (PE/EVOH and PA6/EVOH polymer blends). - Fabrication and study on properties of gas barrier multilayer polymeric films based on polymer blends of EVOH. - Study on application of gas barrier multilayer packaging to preserve some dry agricultural products (maize, soybeans). 4. Cấu trúc của luận án The dissertation has 111 pages, including the Preface, Chapter 1: Overview, Chapter 2: Experiment, Chapter 3: Results and discussions, Chapter 4: Conclusions, P ...