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1. Development of New Antioxidant Active Packaging Films Based on Ethylene Vinyl Alcohol Copolymer (EVOH) and Green Tea Extract

Author:
López de Dicastillo, Carol; Nerín, Cristina; Alfaro, Pilar; Catalá, Ramón; Gavara, Rafael; Hernández-Mun̈oz, Pilar
Source:
Journal of agricultural and food chemistry 2011 v.59 no.14 pp. 7832-7840
ISSN:
0021-8561
Subject:
catechin; crystal structure; diffusivity; ethanol; ethylene; extrusion; foods; free radicals; gallic acid; glass transition temperature; green tea; high performance liquid chromatography; molecular weight; oxygen; packaging; packaging films; partition coefficients; relative humidity
Abstract:
... Ethylene vinyl alcohol copolymer (EVOH) films containing green tea extract were successfully produced by extrusion. The films were brown and translucent, and the addition of the extract increased the water and oxygen barrier at low relative humidity but increased the water sensitivity, the glass transition temperature, and the crystallinity of the films and improved their thermal resistance. An an ...
DOI:
10.1021/jf201246g
PubMed:
21682295

2. Thermal, Mechanical and Microstructures Properties of Cellulose Derivatives Films: A Comparative Study

Author:
Espinoza-Herrera, Norma; Pedroza-Islas, Ruth; San Martín-Martinez, Eduardo; Cruz-Orea, Alfredo; Tomás, Sergio Armando
Source:
Food biophysics 2011 v.6 no.1 pp. 106-114
ISSN:
1557-1858
Subject:
microstructure; thermal diffusivity; methylcellulose; dispersions; X-ray diffraction; waxy corn; pectins; biopolymers; crystal structure; diffusivity; roughness; atomic force microscopy; starch; modulus of elasticity; tensile strength
Abstract:
... The proposal in this study was to evaluate the physical properties of different biopolymers films. The materials used were: pectin, carboxyl methylcellulose, methylcellulose, hydroxyl propylcellulose, hydroxypropyl-methylcellulose, and corn waxy starch; from these polysaccharides aqueous dispersions were prepared to 3% (w/v) for obtained films. In these biopolymer films, the thermal diffusivities ...
DOI:
10.1007/s11483-010-9181-0

3. Effect of β-sheet crystalline content on mass transfer in silk films

Author:
Karve, Kiran A.; Gil, Eun Seok; McCarthy, Stephen P.; Kaplan, David L.
Source:
Journal of membrane science 2011 v.383 no.1-2 pp. 44-49
ISSN:
0376-7388
Subject:
artificial membranes; crystal structure; diffusivity; drugs; fibroins; fluorescein; lysozyme; mass transfer; permeability; silk; silk proteins; vitamin B12
Abstract:
... The material properties of silk are favorable for drug delivery due to the ability to control material structure and morphology under ambient, aqueous processing conditions. Mass transport of compounds with varying physical–chemical characteristics was studied in silk fibroin films with control of β-sheet crystalline content. Two compounds, vitamin B12 and fluorescein isothiocynate (FITC) labeled ...
DOI:
10.1016/j.memsci.2011.08.032
PubMed:
22135474
PubMed Central:
PMC3224987

4. Interaction of gas molecules with crystalline polymer separation membranes: Atomic-scale modeling and first-principles calculations

Author:
Wang, Yanting; Rashkeev, Sergey N.; Klaehn, John R.; Orme, Christopher J.; Peterson, Eric S.
Source:
Journal of membrane science 2011 v.384 no.1-2 pp. 176-183
ISSN:
0376-7388
Subject:
artificial membranes; carbon dioxide; crystal structure; crystals; diffusivity; gases; methane; models; molecular dynamics; nitrogen; permeability; polymers; swelling (materials)
Abstract:
... Carbon dioxide (CO₂)-induced plasticization can significantly decrease the gas separation performance of membranes in high-temperature or high pressure conditions, such as industrial methane (CH₄) separations. In this paper, we investigated the crystalline phase of three polymers (polybenzimidazole (PBI), bis(isobutylcarboxy)polybenzimidazole (PBI-Butyl), and Kapton™) and interactions between gas ...
DOI:
10.1016/j.memsci.2011.09.020

5. Study on the morphology and gas permeation property of polyurethane membranes

Author:
Sadeghi, Morteza; Semsarzadeh, Mohammad Ali; Barikani, Mehdi; Ghalei, Behnam
Source:
Journal of membrane science 2011 v.385-386 pp. 76-85
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; artificial membranes; carbon dioxide; crystal structure; diffusivity; gases; mixing; nitrogen; permeability; polyols; polyurethanes; separation; solubility
Abstract:
... This work presents the structural properties of gas permeation of a group of polyurethane membranes. All polymers were synthesized using a 1:3:2 molar ratio of polyol:diisocyanate:chain extender. The obtained results from Fourier transform infrared spectrometer (FT-IR) of polymers indicate that by changing the diisocyanate from aromatic to linear aliphatic, the microphase separation of hard and so ...
DOI:
10.1016/j.memsci.2011.09.024