In Situ Curing of a Polymer Film for Light-Proof Coring of Deep Rocks with Preservation of Rock Quality and Moisture

Deep in situ rock mechanic is of great significance for deep foundation research and engineering application. In order to explore the deep in situ mechanical law, it is necessary to maintain the in situ environment, which means to achieve fidelity coring. However, at present, there is a lack of method of deep rocks with quality-preserving, moisture-preserving, and light-proof to obtain deep rock specimens, making it difficult to obtain in situ scientific information of the core. In this study, we developed a novel in situ quality-preserving coring method of deep rocks based on an in situ film-forming process. In this method, a solution was covered on the core, and then a sealing polymer film was formed through crosslinking reaction. Organic montmorillonite and carbon black functional fillers were incorporated to further reduce the O2 and water vapor permeability and light transmittance of the polymer sealing film. The sealing film was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. Compared to the neat silicone rubber film, the O2 and water vapor permeability and light transmittance of the sealing film were reduced by 81.2%, 84.4%, and 100%, respectively. In addition, the mechanical and thermal stability of the sealing film was excellent; it showed an elongation at a break of 98.0% and a tensile strength of 0.857 MPa. Moreover, a simulator was developed and the sealing film showed an excellent quality-preserving ability on the rock specimens. The significant improvement demonstrated that the method developed in this research may open up new opportunities for the development of the in situ quality-preserving coring method of deep rocks and construction of deep in situ rock mechanics.

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Morphology, order, light transmittance, and water vapor permeability of aluminum-coated polypropylene zeolite composite films

Journal of Applied Polymer Science ◽

10.1002/app.33300 ◽

2010 ◽

Vol 120 (3) ◽

pp. 1671-1678 ◽

Cited By ~ 8

Author(s):

Devrim Balköse ◽

Kaan Oguz ◽

Lutfi Ozyuzer ◽

Suleyman Tari ◽

Esen Arkis ◽

...

Keyword(s):

Water Vapor ◽

Composite Films ◽

Water Vapor Permeability ◽

Light Transmittance ◽

Vapor Permeability ◽

Zeolite Composite

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Antibacterial and biological properties of coconut oil loaded poly(ε-caprolactone)/gelatin electrospun membranes

Journal of Industrial Textiles ◽

10.1177/1528083721991595 ◽

2021 ◽

pp. 152808372199159 ◽

Cited By ~ 1

Author(s):

Parian S Mohamadi ◽

Ahmad Hivechi ◽

Hajir Bahrami ◽

Nahid hemmatinegad ◽

Peiman B Milan

Keyword(s):

Antibacterial Activity ◽

Water Vapor ◽

Coconut Oil ◽

Water Vapor Permeability ◽

Biological Properties ◽

Morphological Properties ◽

Vapor Permeability ◽

Crosslinking Reaction ◽

Water Contact ◽

Bio Oil

Coconut oil (CO) is a naturally derived bio-oil which exhibits specific characteristics such as biocompatibility and antibacterial activity. In this work, the biological properties of poly(caprolactone)/gelatin (PCL/Gel) nanofibers are improved using CO encapsulation. This bio-oil was added to the PCL/Gel polymer solution with different concentrations (5–40%). Nanofibers were crosslinked using glutaraldehyde vapor. Different types of characterization techniques such as SEM, FTIR, DSC, tensile measurements, water contact angle, and water vapor permeability were used to study the chemical, physical, thermal, and morphological properties of resultant nanofibers. Results showed an average diameter of 300–370 nm for as-spun nanofibers, which increased to 360–470 nm after the crosslinking reaction. The presence of CO was confirmed using FTIR and DSC experiments. Moreover, results indicated that the presence of CO increases the hydrophilicity and water vapor permeability of nanofibers, which are desirable for their final application. Biological tests, such as antibacterial activity, cell viability, and cell morphology tests were performed to evaluate the possible application of the produced nanofibers for wound healing applications. Results indicated that the crosslinked PCL/Gel nanofibers containing 20% CO exhibited the highest cell compatibility and antibacterial activity against gram-positive (S. aureus) and gram-negative ( E. coli) bacteria.

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The relationship of structure, thermal and water vapor permeability barrier properties of poly(butylene succinate)/organomodified beidellite clay bionanocomposites prepared by in situ polycondensation

RSC Advances ◽

10.1039/d0ra07521c ◽

2020 ◽

Vol 10 (61) ◽

pp. 37314-37326

Author(s):

Mohamed Ilsouk ◽

Mustapha Raihane ◽

Benaissa Rhouta ◽

Remo Merijs Meri ◽

Janis Zicans ◽

...

Keyword(s):

Water Vapor ◽

Water Vapor Permeability ◽

Barrier Properties ◽

Vapor Permeability ◽

Permeability Barrier ◽

Butylene Succinate ◽

Biodegradable Nanocomposites ◽

Relationship Of ◽

The Relationship

The exploitation of beidellite clay (BDT), used as a nanofiller in the preparation of poly(butylene succinate) (PBS)/organoclay biodegradable nanocomposites, was investigated. Their thermal and water vapor barrier properties were also studied.

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Preparation and Characterization of Bioactive Chitosan-Based Films Incorporated with Olive Leaves Extract for Food Packaging Applications

Coatings ◽

10.3390/coatings11111339 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1339

Author(s):

Enrica Musella ◽

Ismael Chahed el Ouazzani ◽

Ana Rita Mendes ◽

Cesare Rovera ◽

Stefano Farris ◽

...

Keyword(s):

Water Vapor ◽

Food Packaging ◽

Antimicrobial Properties ◽

Water Vapor Permeability ◽

Lag Phase ◽

Vapor Permeability ◽

Olive Leaves ◽

Chitosan Films

Chitosan films with olive leaf extract (OLE) incorporated at different concentrations were characterized regarding their antimicrobial, antioxidant and some relevant physical properties (i.e., solubility, water vapor permeability, and tensile properties). Results indicate that the active films have substantial antimicrobial activity against Listeria monocytogenes and Campylobacter jejuni mostly extending the microorganisms lag phase. A lower level of inhibition was found in the case of Escherichia coli. However, the OLE seems not to improve the intrinsic antimicrobial properties of the chitosan itself, except for C. jejuni. These results were confirmed with in situ testing using chicken. The chitosan films with OLE exhibited antioxidant activity, increasing with the OLE concentration, from 0.04 to 0.15 g/L ascorbic acid equivalents, corresponding to films with 10%–30% OLE relative to the chitosan. Chitosan films loaded with OLE exhibited a higher solubility in food simulants and a reduced permeability against water vapor. Overall, the combination of OLE and chitosan allows to obtain a promising active bio-based packaging solution for addressing safety and quality issues.

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Ultraviolet blocking and antioxidant polyvinyl alcohol films incorporated with baicalin extraction from Scutellaria baicalensis Georgi

Journal of Polymer Engineering ◽

10.1515/polyeng-2020-0071 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Jinshu Liu ◽

Xiaoyan Ma ◽

Wenzhao Shi ◽

Jianwei Xing ◽

Chaoqun Ma ◽

...

Keyword(s):

Water Vapor ◽

Polyvinyl Alcohol ◽

Radical Scavenging Activity ◽

Antioxidant Properties ◽

Radical Scavenging ◽

Water Vapor Permeability ◽

Scutellaria Baicalensis ◽

Vapor Permeability ◽

Protective Film ◽

Uv Blocking

Abstract Baicalin, an active flavonoid ingredient of Scutellaria baicalensis Georgi, was extracted by heat reflux extraction and showed the same significance UV absorption property with standard baicalin. Active films were prepared from polyvinyl alcohol (PVA) containing baicalin extract by casting method. The effect of baicalin extracts on the UV-blocking, optical, antioxidant property, water vapor permeability, swelling and mechanical properties of the films were studied. UV–vis transmittance spectra showed that PVA films incorporated with baicalin extract blocked ultraviolet light range from 280–400 nm even with low concentration of baicalin (0.5 wt%) and maintain the high transparency in visible spectrum. The outstanding UV-blocking properties of PVA films incorporated with baicalin extract were also confirmed by Rhodamine B degradation. Baicalin conferred antioxidant properties to PVA films as determined by DPPH radical scavenging activity. Due to the interaction between hydroxy groups of baicalin and PVA molecule, water vapor permeability, swelling and elongation at break of the films were decreased accompanied with the increasing in tensile strength and Young’s modulus. FTIR reveal that the interaction between PVA molecules was significant changed by the introduction of baicalin. These results suggest that PVA film incorporated with baicalin extract can be used for the development of functional protective film.

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The Effect of Extraction Conditions on the Barrier and Mechanical Properties of Kefiran Films

Coatings ◽

10.3390/coatings11050602 ◽

2021 ◽

Vol 11 (5) ◽

pp. 602

Author(s):

Carmen Rodica Pop ◽

Teodora Emilia Coldea ◽

Liana Claudia Salanţă ◽

Alina Lăcrămioara Nistor ◽

Andrei Borşa ◽

...

Keyword(s):

Water Vapor ◽

Conformational Changes ◽

Water Vapor Permeability ◽

Edible Films ◽

Film Structure ◽

Water Soluble ◽

Vapor Permeability ◽

Water Molecules ◽

Compact Structure ◽

Technology Applications

Kefiran is an exopolysaccharide classified as a heteropolysaccharide comprising glucose and galactose in equimolar quantities, and it is classified as a water-soluble glucogalactan. This work aimed to investigate the effect of different extraction conditions of kefiran on the structural and physical properties of the edible films obtained. Fourier-transform infrared spectroscopy and scanning electron microscopy were performed, together with a determinations of moisture content, solubility, water vapor permeability and degree of swelling. The kefiran films presented values of the water vapor permeability between 0.93 and 4.38 × 10−11 g/m.s.Pa. These results can be attributed to the development of a more compact structure, where glycerol had no power to increase the free volume and the water vapor diffusion through their structure. The possible conformational changes in the kefiran film structure, due to the interspersing of the plasticizers and water molecules that they absorb, could be the reason for producing flexible kefiran films in the case of using glycerol as a plasticizer at 7.5% w/w. Moreover, it was observed that the extraction conditions are a significant factor in the properties of these films and their food technology applications.

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Development of PE/PCL Bilayer Films Modified with Casein and Aluminum Oxide

Molecules ◽

10.3390/molecules26113090 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3090

Author(s):

Anita Ptiček Siročić ◽

Ana Rešček ◽

Zvonimir Katančić ◽

Zlata Hrnjak-Murgić

Keyword(s):

Mechanical Properties ◽

Thermal Properties ◽

Water Vapor ◽

Aluminum Oxide ◽

Water Vapor Permeability ◽

Vapor Permeability ◽

Mechanical And Thermal Properties ◽

Oxide Compound ◽

Bilayer Films ◽

Oxide Particles

The studied samples were prepared from polyethylene (PE) polymer which was coated with modified polycaprolactone (PCL) film in order to obtain bilayer films. Thin PCL film was modified with casein/aluminum oxide compound to enhance vapor permeability as well as mechanical and thermal properties of PE/PCL films. Casein/aluminum oxide modifiers were used in order to achieve some functional properties of polymer film that can be used in various applications, e.g., reduction of water vapor permeability (WVTR) and good mechanical and thermal properties. Significant improvement was observed in mechanical properties, especially in tensile strength as well as in water vapor values. Samples prepared with aluminum oxide particles indicated significantly lower values up to 60%, and samples that were prepared with casein and 5% Al2O3 showed the lowest WVTR value.

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Reduction of Water Vapor Permeability in Food Multilayer Biopackaging by Epitaxial Crystallization of Beeswax

Food and Bioprocess Technology ◽

10.1007/s11947-021-02628-9 ◽

2021 ◽

Author(s):

Florencia Cruces ◽

María Guadalupe García ◽

Nelio Ariel Ochoa

Keyword(s):

Water Vapor ◽

Water Vapor Permeability ◽

Vapor Permeability ◽

Epitaxial Crystallization

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Upcycling of Vine Shoots: Production of Fillers for PHBV-Based Biocomposite Applications

Journal of Polymers and the Environment ◽

10.1007/s10924-020-01884-8 ◽

2020 ◽

Cited By ~ 1

Author(s):

Grégoire David ◽

Laurent Heux ◽

Stéphanie Pradeau ◽

Nathalie Gontard ◽

Hélène Angellier-Coussy

Keyword(s):

Water Vapor ◽

Gas Phase ◽

Mechanical Performance ◽

Low Cost ◽

Water Vapor Permeability ◽

Contact Angles ◽

Vapor Permeability ◽

Water Contact ◽

Median Diameter ◽

Cost Of Materials

Abstract This paper aims at investigating the potential of vine shoots (ViSh) upcycling as fillers in novel poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) based biocomposites. ViSh particles of around 50 µm (apparent median diameter) were obtained combining dry grinding processes, and mixed with PHBV using melt extrusion. Thermal stability and elongation at break of biocomposites were reduced with increasing contents of ViSh particles (10, 20 and 30 wt%), while Young’s modulus and water vapor permeability were increased. It was shown that a surface gas-phase esterification allowed to significantly increase the hydrophobicity of ViSh particles (increase of water contact angles from 59° to 114°), leading to a reduction of 27% in the water vapor permeability of the biocomposite filled with 30 wt% of ViSh. The overall mechanical performance was not impacted by gas-phase esterification, demonstrating that the interfacial adhesion between the virgin ViSh particles and the PHBV matrix was already good and that such filler surface treatment was not required in that case. It was concluded that ViSh particles can be interestingly used as low cost fillers in PHBV-based biocomposites to decrease the overall cost of materials.

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