Study of Cross-Linking between Boric Acid and Different Types of Polyvinyl Alcohol Adhesive

Gadhave, Ravindra V.; Mahanwar, Prakash A.; Gadekar, Pradeep T.

doi:10.4236/ojpchem.2019.91002

Cited by 26 publications

(13 citation statements)

References 11 publications

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“…In addition, the occurrence of crosslinking reaction between glutinous rice flour and boric acid caused an increase in the viscosity of the precursor suspensions [17]. Similar result has been reported by Gadhave et al [18] who studied on crosslinking between boric acid and polyvinyl alcohol (PVA). The authors explained that the created crosslinks caused the difficulty for the PVA chains to move along in the suspension so that the viscosity increased.…”

Section: Influence Of Mixing Time On the Homogeneity Of Precursorsupporting

confidence: 81%

Influence of precursor preparation on the synthesis of boron carbide from glutinous rice flour

Dateraksa

Sinchai

2021

J Met Mater Miner

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Boron carbide is a promising candidate for a variety of applications, including blasting nozzles, neutron moderators, and lightweight armor. Using of inexpensive and readily available starting materials which can react with boric acid to form B-O-C bonds, e.g., glutinous rice flour, is one of alternative means to produce high purity boron carbide powder at low temperature. In this study, boric acid and glutinous rice flour, boron and carbon sources, were used for synthesizing B4C powder by the carbothermic reduction. The mole ratios of boric acid to glutinous rice flour ranging from 1:1 to 2.5:1 were formulated and mixed by continuous stirring at 80℃ for 2 h to 8 h. The influence of reaction time during the mixing process on the phase formation of the synthesized powder was investigated. It was found that appropriate reaction time for condensation of 4 h facilitated the B4C phase formation during synthesis. The precursors were synthesized under Ar flow at 1350℃ to 1450℃ for 5 h without calcination. B4C powder with the purity of 90 wt% was successfully synthesized from this study. Chemical bonding, phase analysis, and morphology of the synthesized powder were identified by Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscope, respectively. The influences of starting composition and synthesis temperature on the characteristics of the synthesized powders were also discussed.

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Section: Influence Of Mixing Time On the Homogeneity Of Precursorsupporting

confidence: 81%

Influence of precursor preparation on the synthesis of boron carbide from glutinous rice flour

Dateraksa

Sinchai

2021

J Met Mater Miner

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“…It has been proven that the prepared PVA films possessed excellent motion sensitivity when in contact with human skin, but the self-adhesive ability to different surfaces has not been studied. PVA has intrinsic adhesive properties and is used as wood adhesives in industry. − It is speculated that PVA has excellent self-adhesive properties because of the hydroxyl groups present on the film surface, which can form a considerable amount of hydrogen bonds between various material surfaces in the presence of moisture. Figure a shows the self-adhesive experiment of CNF Fe /PVA films.…”

Section: Resultsmentioning

confidence: 99%

Self-Healable Conductive Nanocellulose Nanocomposites for Biocompatible Electronic Skin Sensor Systems

Han

Cui

et al. 2019

ACS Appl. Mater. Interfaces

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Electronic skins are developed for applications such as biomedical sensors, robotic prosthetics, and human–machine interactions, which raise the interest in composite materials that possess both flexibility and sensing properties. Polypyrrole-coated cellulose nanocrystals and cellulose nanofibers were prepared using iron(III) chloride (FeCl3) oxidant, which were used to reinforce polyvinyl alcohol (PVA). The combination of weak H-bonds and iron coordination bonds and the synergistic effect of these components yielded self-healing nanocomposite films with robust mechanical strength (409% increase compared to pure PVA and high toughness up to 407.1%) and excellent adhesion (9670 times greater than its own weight) to various substrates in air and water. When damaged, the nanocomposite films displayed good mechanical (72.0–76.3%) and conductive (54.9–91.2%) recovery after a healing time of 30 min. More importantly, the flexible nanocomposites possessed high strain sensitivity under subtle strains (<48.5%) with a gauge factor (GF) of 2.52, which was relatively larger than the GF of ionic hydrogel-based skin sensors. These nanocomposite films possessed superior sensing performance for real-time monitoring of large and subtle human motions (finger bending motions, swallowing, and wrist pulse); thus, they have great potentials in health monitoring, smart flexible skin sensors. and wearable electronic devices.

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“…4 13 C NMR spectrum of PVA-E-Pz is observed to be 76.40 °C and 86.05 °C. During the formation of cross-linking polymer the intermolecular interactions between the chains increases and T g value also increases [62]. Thus, a slight shift is observed in the position of T g value of PVA-E-Pz when compared to PVA.…”

Section: Thermal Analysismentioning

confidence: 90%

One-Pot Synthesis of Polyvinyl Alcohol-Piperazine Cross-Linked Polymer for Antibacterial Applications

et al. 2022

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The spread of microbes which cause infectious diseases are of great concern on human health. Therefore, a water-soluble cross-linked polymer based on polyvinyl alcohol was synthesized via an economical, facile, and aqueous-based approach. The resultant cross-linked polymer was characterized by different techniques such as FTIR, 1H NMR, 13C NMR, TGA, and DSC. The IR spectrum has been recorded in the range 400–4000 cm−1. From thermal studies, i.e. TGA, cross-linking polymer PVA-E-Pz showed two step degradation and from DSC, glass transition temperature (Tg) was exhibited at 86.05 °C. The antimicrobial properties of the cross-linked polymer were studied using the well-diffusion technique and optical density method against gram-negative bacteria, Escherichia coli and gram-positive bacteria, Staphylococcus aureus. Polymer coated fabric was also evaluated for antimicrobial activity against both the bacteria, even after 25 wash cycles the coated fabric showed about 90% antibacterial activity. Samples showed good antimicrobial activity against both the micro-organisms, but more activity was exhibited against gram-negative bacteria. The coating durability and surface morphology of the coated fabric were also analyzed. Cytotoxicity studies revealed that PVA-E-Pz was non-toxic against human dermal fibroblast cell lines. This material might be a good fit for advanced wound dressing and textile applications. The proposed strategy provides a low-cost, environmentally friendly method for creating a new cross-linked polymer with antimicrobial activity. Graphical Abstract

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Study of Cross-Linking between Boric Acid and Different Types of Polyvinyl Alcohol Adhesive

Cited by 26 publications

References 11 publications

Influence of precursor preparation on the synthesis of boron carbide from glutinous rice flour

Influence of precursor preparation on the synthesis of boron carbide from glutinous rice flour

Self-Healable Conductive Nanocellulose Nanocomposites for Biocompatible Electronic Skin Sensor Systems

One-Pot Synthesis of Polyvinyl Alcohol-Piperazine Cross-Linked Polymer for Antibacterial Applications

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