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The Preparation, Structure and Properties of EVOH/nano-SiO2 Packaging Composites with High-barriers

Author: LiuYiWu
Tutor: LiuYueJun；WeiShanShan
School: Hunan University
Course: Materials Processing Engineering
Keywords: EVOH Nano-SiO2 Nanocomposites Vibration force field Barrier properties
CLC: TB484
Type: Master's thesis
Year: 2010
Downloads: 118
Quote: 0
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Abstract


Product damage and impact by various unfavorable factors in the flow of the process of the Central Standing Committee of the storage, transportation and other reasonable packaging allows the product from or reduce these impacts. Control of gas composition and content of the package, can be achieved through high barrier materials packaging products to effectively extend the shelf life of the product, the high barrier materials become one of the most important function of packaging materials. 2 barrier packaging materials preparation, structure and properties of the subject of the EVOH / nano-SiO main content: composite shear force field, were prepared by chemical precipitation of nano-SiO 2 and product characterization; different blend prepared EVOH / nano-SiO 2 composites, processing (blending technology and blown film process ) characterization of composite materials, analysis of the impact of the processing technology for the preparation of high-barrier packaging film structure and properties; different coupling agent and polymer grafting modified nano-SiO 2 and preparation of composite materials with EVOH composite the composite interface structure, and discuss the relationship between the interface structure and its performance; prepared better processing and nano SiO 2 modified method EVOH / nano-SiO 2 composite membranes and plates, the system of membranes and plates were characterized, and its ultraviolet irradiation treatment, ultraviolet irradiation processing of composite film ; vibration force field processing EVOH / nano-SiO 2 composite film under vibration force field processing high barrier material of their structure and properties. The results show that: the nano an SiO complex shear force field 2 morphology of substantially spherical, average particle diameter of 19.5 nm and a narrow distribution, good effect in situ modified; reasonable processing The process improvement of EVOH / nano SiO 2 composite film structure ordered degree and a crystalline form, so that the performance of the film has been markedly improved; solution blend prepared composites, nano-SiO 2 than melt blending method is good in dispersibility in EVOH; polymer graft-modified and the coupling agent-modified nano-SiO 2 the dispersibility in the EVOH, compatibility and interface role has been to improve the performance of the composite membrane improved, KH550 better system modifier; nano-SiO 2 Fill EVOH composite crystalline properties can improve, so that the composite membranes with various properties of the sheet material has been markedly improved; reasonable ultraviolet irradiation can also improve the performance of the composite membrane; the Vibration Force machining composites improved nano - SiO 2 dispersibility, changing the crystal polymorphs and orientation of the composite material, leaving the performance of the composite material is improved.

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CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Packaging Engineering > Packaging materials
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