The impact of seawater on the barrier properties and biodegradability of polylactide films with polyhexamethylene guanidine derivatives Wpływ wody morskiej na właściwości barierowe i podatność na biodegradację polilaktydowych folii z pochodnymi poliheksametylenoguanidyny

2017 ◽  
Vol 1 (5) ◽  
pp. 232-235
Author(s):  
Agnieszka Richert
Keyword(s):  
Barrier Properties ◽  
Guanidine Derivatives ◽  
Polyhexamethylene Guanidine ◽  
The Impact

Microbial degradation of polyhydroxybutyrate with embedded polyhexamethylene guanidine derivatives

2021 ◽  
Author(s):  
Maria Swiontek Brzezinka ◽  
Agnieszka Richert ◽  
Agnieszka Kalwasińska ◽  
Joanna Świątczak ◽  
Edyta Deja-Sikora ◽  
...  
Keyword(s):  
Microbial Degradation ◽  
Guanidine Derivatives ◽  
Polyhexamethylene Guanidine

Modification of Polylactic Acid/ Halloysite Bionanocomposites Using Electron Beam Radiation: Physical, Barrier and Thermal Properties

2020 ◽  
Vol 1002 ◽  
pp. 57-65
Author(s):  
Abdulkader M. Alakrach ◽  
Nik Noriman Zulkepli ◽  
Awad A. Al-Rashdi ◽  
Sam Sung Ting ◽  
Rosniza Hamzah ◽  
...  
Keyword(s):  
Electron Beam ◽  
Polylactic Acid ◽  
Food Packaging ◽  
Electron Beam Irradiation ◽  
Casting Process ◽  
Barrier Properties ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Processing ◽  
The Impact

This study aimed to develop novel Polylactic acid/ Halloysite (PLA/ HNTs) films which showed better properties when they were used for food packaging. They also displayed better mechanical, barrier, morphological and structural properties when the researchers analysed the impact of the electron beam irradiation on the nanomaterials. They prepared PLA-based nanocomposites containing 5 % w/w of HNTs using the solution casting process. These nanocomposites were further exposed to different ebeam doses (i.e., 0, 20, 40 and 60 kGy). The researchers assessed the effect of the electron beam irradiation on the various properties of the PLA. All the composites showed a homogenous dispersion and distribution of the HNTs in this PLA matrix. Results indicated that the nanocomposites showed better barrier properties in comparison to the neat PLA. Furthermore, the ebeam irradiation could increase the glass-transition temperature and lead to the development of more crosslinks, which increased the degradation temperature and hydrophilicity of the nanocomposites. In this study, the researchers showed that the PLA/HNTs films were effective materials that could be used for the electron beam processing of the pre-packed foods. The best effect was noted for the 20 kGy dosage which was used in the study.

scholarly journals Environmentally Friendly Packaging Materials Based on Thermoplastic Starch

2019 ◽  
Vol 33 (3) ◽  
pp. 347-361 ◽  
Author(s):  
Vesna Ocelić Bulatović ◽  
Anamarija Turković ◽  
Emi Govorčin Bajsić ◽  
Romana Zovko ◽  
Antun Jozinović ◽  
...  
Keyword(s):  
Morphological Structure ◽  
Barrier Properties ◽  
Thermoplastic Starch ◽  
Packaging Material ◽  
Low Density Polyethylene ◽  
Scanning Calorimetry ◽  
Environmental Persistence ◽  
Short Service Life ◽  
The Impact ◽  
Scanning Electron

Low-density polyethylene (LDPE) is extensively used as packaging material, and as such has a short service life, but long environmental persistence. The alternative to reducing the impact of LDPE as packaging material on the environment is to blend it with carbohydrate-based polymers, like starch. Therefore, the focus of this investigation was to prepare bio-based blends of LDPE and thermoplastic starch (TPS) containing different amounts of TPS using a Brabender kneading chamber. Due to incompatibility of LDPE/ TPS blends, a styrene–ethylene/butylene–styrene block copolymer, grafted with maleic anhydride (SEBS-g-MA) containing 2 mol % anhydride groups, was added as a compatibilizer. The effect of the biodegradable, hydrophilic TPS, its content, and the incorporation of the compatibilizer on the properties of LDPE/TPS blends were analysed. The characterization was performed by means of thermogravimetric analysis (TG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and water absorption (WA). Based on the results of the morphological structure, a good dispersion of the TPS phase in LDPE matrix was obtained with the incorporation of compatibilizer, which resulted in better thermal and barrier properties of these materials.

scholarly journals Multi-scale analysis of the impact of polylactide morphology on gas barrier properties

Polymer ◽  
2017 ◽  
Vol 108 ◽  
pp. 163-172 ◽  
Author(s):  
Samira Fernandes Nassar ◽  
Alain Guinault ◽  
Nicolas Delpouve ◽  
Véronique Divry ◽  
Violette Ducruet ◽  
...  
Keyword(s):  
Barrier Properties ◽  
Scale Analysis ◽  
Gas Barrier ◽  
Multi Scale ◽  
The Impact ◽  
Multi Scale Analysis ◽  
Gas Barrier Properties

scholarly journals Pharmacotherapy: Its impact on morphofunctional characteristics of the epidermal barrier

2019 ◽  
Vol 95 (1) ◽  
pp. 59-76 ◽  
Author(s):  
D. D. Petrunin
Keyword(s):  
Literature Review ◽  
Systemic Therapy ◽  
Skin Disease ◽  
Barrier Properties ◽  
Physiological Characteristics ◽  
Human Epidermis ◽  
Disease Treatment ◽  
Epidermal Barrier ◽  
The Impact

Various pharmaceuticals used for topical and systemic therapy are capable of exerting significant impact on morphological and physiological characteristics of human epidermis, as well as its barrier properties. This may affect the course of dermatologic diseases and the efficacy of their treatment. In this literature review, the author analyzes the impact of various pharmaceutical classes on the morphofunctional characteristics of the epidermal barrier and formulates recommendations for skin disease treatment.

The impact of microwave-assisted thermal sterilization on the morphology, free volume, and gas barrier properties of multilayer polymeric films

2014 ◽  
Vol 131 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sumeet Dhawan ◽  
Christopher Varney ◽  
Gustavo V. Barbosa-Cánovas ◽  
Juming Tang ◽  
Farida Selim ◽  
...  
Keyword(s):  
Free Volume ◽  
Barrier Properties ◽  
Polymeric Films ◽  
Gas Barrier ◽  
Microwave Assisted ◽  
Thermal Sterilization ◽  
The Impact ◽  
Gas Barrier Properties

New ways of thinking about (and teaching about) intestinal epithelial function

2008 ◽  
Vol 32 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Kim E. Barrett
Keyword(s):  
Ion Transport ◽  
Tight Junctions ◽  
Hydrogen Exchange ◽  
De Novo ◽  
Intestinal Barrier ◽  
Barrier Properties ◽  
Chloride Secretion ◽  
Sodium Absorption ◽  
Intestinal Epithelial ◽  
The Impact

This article summarizes a presentation made at the Teaching Refresher Course of the American Physiological Society, which was held at the Experimental Biology meeting in 2007. The intestinal epithelium has important ion transport and barrier functions that contribute pivotally to normal physiological functioning of the intestine and other body systems. These functions are also frequently the target of dysfunction that, in turn, results in specific digestive disease states, such as diarrheal illnesses. Three emerging concepts are discussed with respect to ion transport: the complex interplay of intracellular signals that both activate and inhibit chloride secretion; the role of multiprotein complexes in the regulation of ion transport, taking sodium/hydrogen exchange as an example; and acute and chronic regulation of colonic sodium absorption, involving both sodium channel internalization and de novo synthesis of new channels. Similarly, recently obtained information about the molecular components of epithelial tight junctions and the ways in which tight junctions are regulated both in health and disease are discussed to exemplify ways to teach about intestinal barrier properties. Finally, both genetically determined intestinal diseases and those arising as a result of infections and/or inflammation are described, and these can be used as the means to enhance the basic and clinical relevance of teaching about intestinal epithelial physiology as well as the impact that the understanding of such physiology has had on associated therapeutics. The article also indicates, where relevant, how different approaches may be used effectively to teach related concepts to graduate versus medical/professional student audiences.

scholarly journals Influence of polysiloxane microspheres on hydrophobicity, structure and mechanical properties of paper materials

Cellulose ◽  
2021 ◽  
Author(s):  
Piotr Pospiech ◽  
Konrad Olejnik ◽  
Urszula Mizerska ◽  
Joanna Zakrzewska
Keyword(s):  
Mechanical Properties ◽  
Large Diameter ◽  
Small Diameter ◽  
Average Diameter ◽  
Barrier Properties ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Material Structure ◽  
Liquid Penetration ◽  
The Impact

Abstract The aim of the study was to investigate the impact of three types of polysiloxane microspheres on the barrier properties, structure and mechanical properties of paper. An influence of new silicon filler on properties of cellulose paper sheet was analyzed. Polysiloxane microspheres were used as an additive introduced into the network of cellulosic fibers in order to obtain new functional properties of the paper. The following types of microspheres were used in the research: M1 hydrophilic of average diameter 23.5 µm, M2 hydrophobic of average diameter 3.1 µm and M3 hydrophobic of average diameter 23.5 µm. The obtained handsheets were analyzed for changes in apparent density, roughness, tensile strength, bursting strength, and tear resistance. Wettability and resistance to liquid were characterized by contact angle measurement, penetration dynamics analysis  and uniformity of liquid penetration measured using an extended liquid penetration analyser. It was found that the presence of M2 (small diameter) microspheres improved significantly the paper’s hydrophobicity without changing the mechanical properties. The addition of M1 and M3 (large diameter) microspheres decreased the mechanical properties of the paper samples and did not improve their hydrophobicity. However, M1 microspheres resulted in increased uniformity of liquid penetration through the paper structure. The presented studies also show that it is possible to obtain paper with high hydrophobic properties only through the filling application when polysiloxane microspheres are used for this purpose. The results also indicate that it is not necessary to hydrophobize the entire material structure in order to achieve its high hydrophobicity. Graphic abstract

Influence of Zinc Ions on the Inhibiting Properties of Polyhexamethylene Guanidine Derivatives

2013 ◽  
Vol 49 (3) ◽  
pp. 326-333 ◽  
Author(s):  
V. B. Obraztsov ◽  
E. D. Rubl’ova ◽  
N. V. Amirulloeva
Keyword(s):  
Zinc Ions ◽  
Guanidine Derivatives ◽  
Polyhexamethylene Guanidine
Sign in / Sign up

Export Citation Format

Share Document