Effect of zeolite and boric acid on epoxy-based composites

Visakh, P. M.; Nazarenko, Olga B.; Amelkovich, Yulia A.; Мельникова, Т. В.

doi:10.1002/pat.3776

Cited by 23 publications

(24 citation statements)

References 13 publications

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“…The obtained results revealed that the thermal stability of PHEMA/BA composite hydrogels with the increasing the ratio of BA was improved. In addition, our finding is an agreement with previous studies …”

Section: Resultssupporting

confidence: 94%

Poly(2‐hydroxyethyl methacrylate)/boric acid composite hydrogel as soft contact lens material: Thermal, optical, rheological, and enhanced antibacterial properties

Ulu

Balcıoğlu

Birhanlı

et al. 2018

J of Applied Polymer Sci

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The present work proposes to fabricate a composite hydrogel material that well characterized, transparent, biocompatible, and self‐antibacterial as potential soft contact lens material. For this purpose, poly(2‐hydroxyethyl methacrylate) (PHEMA)/boric acid (BA) composite hydrogels were successfully prepared by chemical crosslinking with BA through in situ polymerization using different BA ratios between 1 and 10% w/w. Afterward, the compositions, thermal stability, transparence, oxygen permeability, water uptake capacity, swelling ratio as well as morphological and rheological properties, in vitro degradability, in vitro cytotoxicity, and antibacterial properties of the all prepared materials were analyzed using a series of different techniques. The thermal stability, hydrophilicity, water uptake, oxygen permeability gradually increased depending ratio of BA, which is desirable for biomaterial. While the transparence and refractive index decreased, the composite hydrogels, except for BA content of 10 wt %, maintained enough transparency to be used for contact lens. In addition, PHEMA/BA composite hydrogels exhibited good cytocompatibility (PHEMA‐1%BA and PHEMA‐3%BA) and excellent antibacterial activity against Gram‐positive (Staphylococcus aureus and Enterococcus faecium) and Gram‐negative (Escherichia coli and Pseudomonas aeruginosa) bacteria. Overall, the results demonstrated that the obtained PHEMA/BA composite hydrogels could be considered as self‐antibacterial contact lens and a potential composite biomaterial for other applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46575.

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Section: Resultssupporting

confidence: 94%

Poly(2‐hydroxyethyl methacrylate)/boric acid composite hydrogel as soft contact lens material: Thermal, optical, rheological, and enhanced antibacterial properties

Ulu

Balcıoğlu

Birhanlı

et al. 2018

J of Applied Polymer Sci

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“…When 0.15% of BA was incorporated, T d2% of cross‐linked aerogel increased to 274°C. It suggested that CNF underwent a thermally induced esterification/cross‐linking process, retarding the pyrolysis of CNFs' molecular backbones . However, further increase in BA content decreased the initial decomposition temperature.…”

Section: Resultsmentioning

confidence: 99%

“…It suggested that CNF underwent a thermally induced esterification/cross-linking process, retarding the pyrolysis of CNFs' molecular backbones. 56 However, further increase in BA content decreased the initial decomposition temperature. The T dmax also began to decline when the BA content was higher than 0.45%.…”

Section: Thermal Stabilitymentioning

confidence: 97%

Boron/nitrogen flame retardant additives cross‐linked cellulose nanofibril/montmorillonite aerogels toward super‐low flammability and improved mechanical properties

Wang

Sánchez‐Soto

Fan

et al. 2019

Polymers for Advanced Techs

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Low‐flammability freeze‐dried cellulose nanofibril (CNF)/sodium montmorillonite (MMT) aerogels with improved mechanical properties were fabricated via a facile cross‐linking of boric acid (BA) and melamine‐formaldehyde (MF) resins. Scanning electron microscopy analysis showed that BA cross‐linking reduced the interspacing of layered CNF/MMT aerogels whereas introduction of MF formed polymeric fibrils that connected the layers. These changes on microstructures resulted in the improvement on compressive mechanical properties of the cross‐linked aerogels. Moreover, the boron (B)/nitrogen (N) containing flame retardant cross‐linkers greatly increased the limiting oxygen index values that could reach 85% and leveled the UL‐94 rating from no rating to V‐0. Cone calorimetric results suggested that BA and MF induced a synergistic effect on the flame retardant properties of the CNF/MMT aerogels. However, the thermal conductivity was little affected because pore structure and size was not substantially modified. This simple approach fabricated highly flame‐resistant and mechanically strong CNF‐based aerogels that could be used in various engineering fields.

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“…Visakh et al studied the effects of different additions of H 3 BO 3 on the fire safety of epoxy resin. They found that the limited oxygen index value increased from 17.6% to 28.1% after adding 10‐wt% H 3 BO 3 , and the thermal stability was significantly improved and more char residue was formed . Uddin explored the effects of boric acid on the flammability and thermal stability of chitosan (CS)/cellulose nanofiber (CNF) composite film.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the limited oxygen index value increased from 17.6% to 28.1% after adding 10-wt% H 3 BO 3 , and the thermal stability was significantly improved and more char residue was formed. 11 Uddin explored the effects of boric acid on the flammability and thermal stability of chitosan (CS)/cellulose nanofiber (CNF) composite film. Their results showed that the addition of boric acid improved the thermal stability of the bicomponent film.…”

mentioning

confidence: 99%

Preparation and mechanism of polyurethane prepolymer and boric acid co‐modified phenolic foam composite: Mechanical properties, thermal stability, and flame retardant properties

Chen

Xu³

et al. 2019

Polymers for Advanced Techs

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In this work, a new kind of co‐modified phenolic foam was synthesized with polyurethane prepolymer (PUP) and H3BO3 by a simple preparation method. Firstly, in order to determine the optimal amount of PUP, the effects of different PUP additions on the mechanical properties, foam microstructure, and pulverization rate of phenolic foam were investigated. Then H3BO3 was added to toughened phenolic foam, in order to reduce its fire hazard. The results showed that the mechanical properties of the PFPUP8 phenolic foam composite were the best when the PUP content was 8 wt%. It had a small and regular cell structure, and its pulverization ratio was reduced by 80% compared with that of pristine phenolic foam. Meanwhile, the flame retardant properties of PFPUP8 were improved in different degrees with an increase in the amount of H3BO3. Particularly, when the addition of H3BO3 was 10 wt%, the peak heat release rate, the total heat release, and the total smoke release values of PFPUP10B were decreased by 35.4%, 42.4%, and 45.2%, respectively, compared with those of PFPUP8. The value of the limit oxygen index was increased by 33.1%. Besides, the addition of H3BO3 had no adverse effect on the mechanical properties and pulverization ratio of PFPUP8. In addition, the specific mechanisms of toughening, flame retardant, and smoke suppression are also discussed in this paper on the basis of an investigation into the thermal properties of the toughened flame retardant foam composites by thermogravimetric analysis in N2 atmosphere.

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Effect of zeolite and boric acid on epoxy-based composites

Cited by 23 publications

References 13 publications

Poly(2‐hydroxyethyl methacrylate)/boric acid composite hydrogel as soft contact lens material: Thermal, optical, rheological, and enhanced antibacterial properties

Poly(2‐hydroxyethyl methacrylate)/boric acid composite hydrogel as soft contact lens material: Thermal, optical, rheological, and enhanced antibacterial properties

Boron/nitrogen flame retardant additives cross‐linked cellulose nanofibril/montmorillonite aerogels toward super‐low flammability and improved mechanical properties

Preparation and mechanism of polyurethane prepolymer and boric acid co‐modified phenolic foam composite: Mechanical properties, thermal stability, and flame retardant properties

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