Efficient flame retardant polyvinyl alcohol membrane through surface graft method

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 35051-35057 ◽  
Author(s):  
Li Liu ◽  
Yuansen Liu ◽  
Yuan Liu ◽  
Qi Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Flame Retardant ◽  
Chemical Reaction ◽  
Membrane Surface ◽  
Reactive Groups ◽  
Surface Graft

This paper introduced an efficient charring method through surface graft. The flame retardant was grafted on membrane surface through the chemical reaction between the reactive groups of the P–Si compound and hydroxyl ones of PVA.

Structural analysis of α-zirconium phosphate/cerium phosphate/graphene oxide nanocomposites with flame-retardant properties in polyvinyl alcohol

2020 ◽  
Vol 44 (11) ◽  
pp. 4568-4577 ◽  
Author(s):  
Qian Leng ◽  
Junyi Li ◽  
Yuhua Wang
Keyword(s):  
Graphene Oxide ◽  
Structural Analysis ◽  
Polyvinyl Alcohol ◽  
Flame Retardant ◽  
Zirconium Phosphate ◽  
Cerium Phosphate ◽  
Ternary Nanocomposite ◽  
Flame Retardant Properties ◽  
Synergistic Flame Retardant

A ternary nanocomposite was developed, which exhibits novel synergistic flame-retardant effect with APP-containing PVA.

Study on Melamine Formaldehyde/Polyvinyl Alcohol Blend Fiber by Electrospinning

2015 ◽  
Vol 1088 ◽  
pp. 424-428
Author(s):  
Lu Lu Li ◽  
Yong Qiang Kang ◽  
Yan Gong Yang ◽  
Ri Min Cong ◽  
Zhao Jia
Keyword(s):  
Polyvinyl Alcohol ◽  
Flame Retardant ◽  
Solid Content ◽  
Solution Viscosity ◽  
Molar Ratio ◽  
Limit Oxygen Index ◽  
Polymerization Temperature ◽  
Condensation Polymerization ◽  
Melamine Formaldehyde ◽  
Content Ratio

Melamine formaldehyde (MF) resin and its derivatives are always considered to be excellent flame retardant material, which has wide application in the flame retardant fabric, high temperature insulating filter materials, etc. However, less research on electro-spinning of melamine fiber has been reported, recently. In the study, the molar ratio, condensation polymerization temperature of formaldehyde and melamine, and the law of effect in different solid content ratio of melamine formaldehyde/polyvinyl alcohol on the electro-spinning were studied. The results showed that the best conditions for spinning were that formaldehyde and melamine molar ratio was 1:1.7, the reaction temperature was 80°C, and the MF-PVA blending solid content ratio was 1:1, meanwhile the morphology of Electron microscopy indicated the good uniformity of the fiber. The fiber presents good flame retardant property in conditions of MF-PVA blending solution viscosity 155mPa ́s, limit oxygen index 33.2%.

scholarly journals In situ repair of graphene defects and enhancement of its reinforcement effect in polyvinyl alcohol hydrogels

RSC Advances ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 1045-1055 ◽  
Author(s):  
Yan Shi ◽  
Dangsheng Xiong ◽  
Jianliang Li ◽  
Kun Wang ◽  
Nan Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Irradiation Dose ◽  
Reinforcement Effect ◽  
Reactive Groups ◽  
Γ Ray ◽  
In Situ Repair

The reactive groups on the edge of graphene defects are activated at a low γ-ray irradiation dose, and the resulting PVA scission chains at the high γ-ray dose link these reactive groups to repair the graphene defects.

scholarly journals Enhanced Thermal Insulation and Flame-Retardant Properties of Polyvinyl Alcohol-Based Aerogels Composited with Ammonium Polyphosphate and Chitosan

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
MinYi Luo ◽  
Jiayou Xu ◽  
Shu Lv ◽  
XueFeng Yuan ◽  
Xiaolan Liang
Keyword(s):  
Polyvinyl Alcohol ◽  
Heat Release ◽  
Flame Retardant ◽  
Thermal Insulation ◽  
Heat Release Rate ◽  
Flame Retardancy ◽  
Release Rate ◽  
Ammonium Polyphosphate ◽  
Composite Aerogel ◽  
Composite Aerogels

Polyvinyl alcohol- (PVA-) based aerogels have attracted widespread attention owing to their low cost, eco-friendliness, and low density. However, the applications of PVA-based aerogels are limited by their flammability. In this study, a flame retardant, ammonium polyphosphate (APP), and a biopolymer, chitosan (CS), were added to polyvinyl alcohol (PVA), and the polymer was further crosslinked using boric acid (H3BO3). In the PVA aerogels, the negatively charged APP and positively charged CS formed a polyelectrolyte complex (PEC) through ionic interaction. Cone calorimetry and vertical burning tests (UL-94) indicated that the PVA composite aerogels have excellent flame retardancy; they could decrease the heat release rate, total heat release rate, and carbon dioxide (CO2) generation. Both PVA/H3BO3 and APP-CS in the composite aerogel could be burned to carbon, and the foamed char layer could act together to impart the PVA composite aerogels with good flame retardancy. Further, the decrease in the temperature at the backside of the aerogels with increasing APP-CS content, as determined by the flame-spraying experiment, indicated that the PVA-based aerogels with APP-CS can also serve as thermal insulation materials. This work provides an effective and promising method for the preparation of PVA-based aerogels with good flame retardancy and thermal insulation property for construction materials.

A novel method to prepare a flame-retardant polyvinyl alcohol fiber with modified acrylonitrile coatings

RSC Advances ◽  
2016 ◽  
Vol 6 (37) ◽  
pp. 31059-31068 ◽  
Author(s):  
Wanli Zhou ◽  
Shaosi Ji ◽  
Pengqing Liu ◽  
Mengjin Jiang ◽  
Jianjun Xu
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Flame Retardant ◽  
Flame Retardance ◽  
Polyvinyl Alcohol Fiber ◽  
Novel Method

A novel fiber with a PVA substrate and modified PAN coating was constructed, which has favorable tensile strength and flame retardance.

scholarly journals Eco-friendly Flame Retardant (FR) Pet Fibers through P – N Synergism

2008 ◽  
Vol 3 (4) ◽  
pp. 155892500800300
Author(s):  
Hari T. Deo ◽  
Nagesh K. Patel ◽  
Bharat K. Patel
Keyword(s):  
Flame Retardant ◽  
High Strength ◽  
Point Of View ◽  
Synthetic Fiber ◽  
Phosphorus Compounds ◽  
Major Constituent ◽  
Fiber Structure ◽  
Reactive Groups ◽  
Pet Fibers ◽  
Reactive Phosphorus

Polyester forms a major constituent among the synthetic fiber industry. It is the most popular synthetic fiber because of its high strength and esthetic appeal. Polyester being highly crystalline, hydrophobic and devoid of reactive groups, it is difficult to introduce reactive phosphorus into the fiber structure through chemical reactions with the phosphorus compounds. Fairly large quantities of the FR chemicals have to be incorporated to achieve self-extinguishing behavior. Although not all Flame Retardant (FR) chemicals are hazardous, it is advisable from an ecological point of view to introduce minimum quantities of FR substances in the fiber structure. The present Paper tries to address the said problems in a small way, so that the PET fiber could be better acceptable. Therefore, graft co-polymerization of nitrogenous vinyl monomers has been carried out on the fiber followed by its reaction with phosphorus chemicals, thereby incorporating reactive phosphorus in the grafted substrate. It has been shown that a very small amount of the FR chemical could impart fire resistance of very high order to polyester. Self-extinguishing characteristic was achieved for poly (ethylene terephthalate) fibers with acrylamide-grafted-phosphorylated (AM-g-P) PET fibers containing just 0.189% phosphorus on-weight-of-fiber (owf). Similar results were obtained for methacrylamide-grafted-phosphorylated (MAm-g-P) polyester fibers at the 0.77% phosphorus content level. Efficiency of phosphorus in presence of nitrogen that was achieved was at 263% for acrylamide (AM) system, while it was −12% for acrylonitrile (AN-phosphorus combination). This is attributed to P-N synergism in case of the FR polyester system when the nitrogen is in the amido form present in AM and MAm monomers.

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