scholarly journals Flame Retardancy of Biobased Composites—Research Development

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5253
Author(s):  
Anna Sienkiewicz ◽  
Piotr Czub
Keyword(s):  
Composite Materials ◽  
Flame Retardants ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Diphenyl Ether ◽  
Polymeric Materials ◽  
Polyamide 11 ◽  
Adverse Health Effects ◽  
Advantages And Disadvantages ◽  
Flame Retardation

Due to the thermal and fire sensitivity of polymer bio-composite materials, especially in the case of plant-based fillers applied for them, next to intensive research on the better mechanical performance of composites, it is extremely important to improve their reaction to fire. This is necessary due to the current widespread practical use of bio-based composites. The first part of this work relates to an overview of the most commonly used techniques and different approaches towards the increasing the fire resistance of petrochemical-based polymeric materials. The next few sections present commonly used methods of reducing the flammability of polymers and characterize the most frequently used compounds. It is highlighted that despite adverse health effects in animals and humans, some of mentioned fire retardants (such as halogenated organic derivatives e.g., hexabromocyclododecane, polybrominated diphenyl ether) are unfortunately also still in use, even for bio-composite materials. The most recent studies related to the development of the flame retardation of polymeric materials are then summarized. Particular attention is paid to the issue of flame retardation of bio-based polymer composites and the specifics of reducing the flammability of these materials. Strategies for retarding composites are discussed on examples of particular bio-polymers (such as: polylactide, polyhydroxyalkanoates or polyamide-11), as well as polymers obtained on the basis of natural raw materials (e.g., bio-based polyurethanes or bio-based epoxies). The advantages and disadvantages of these strategies, as well as the flame retardants used in them, are highlighted.

scholarly journals Fire-Safe Polymer Composites: Flame-Retardant Effect of Nanofillers

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 540
Author(s):  
Yukyung Kim ◽  
Sanghyuck Lee ◽  
Hyeonseok Yoon
Keyword(s):  
Organic Matter ◽  
High Temperature ◽  
Flame Retardant ◽  
Flame Retardants ◽  
Combustion Process ◽  
Polymeric Materials ◽  
Fire Performance ◽  
Gaseous Species ◽  
Advantages And Disadvantages ◽  
Temperature Conditions

Currently, polymers are competing with metals and ceramics to realize various material characteristics, including mechanical and electrical properties. However, most polymers consist of organic matter, making them vulnerable to flames and high-temperature conditions. In addition, the combustion of polymers consisting of different types of organic matter results in various gaseous hazards. Therefore, to minimize the fire damage, there has been a significant demand for developing polymers that are fire resistant or flame retardant. From this viewpoint, it is crucial to design and synthesize thermally stable polymers that are less likely to decompose into combustible gaseous species under high-temperature conditions. Flame retardants can also be introduced to further reinforce the fire performance of polymers. In this review, the combustion process of organic matter, types of flame retardants, and common flammability testing methods are reviewed. Furthermore, the latest research trends in the use of versatile nanofillers to enhance the fire performance of polymeric materials are discussed with an emphasis on their underlying action, advantages, and disadvantages.

scholarly journals Transition to biodegradable composites as a method for solving environmental problems

2020 ◽  
Vol 221 ◽  
pp. 01004
Author(s):  
Gulnaz Sabirova ◽  
Ruslan Safin ◽  
Shamil Mukhametzyanov ◽  
Nour Galyavetdinov
Keyword(s):  
Composite Materials ◽  
Impact Strength ◽  
Negative Impact ◽  
Positive Impact ◽  
Raw Materials ◽  
Polymeric Materials ◽  
Thermal Modification ◽  
Polymer Materials ◽  
Necessary Condition ◽  
Plant Raw Materials

In environmental matters, one of the most pressing problems is the efficient disposal of polymeric materials that have a negative impact on the ecology of soils and oceans. A necessary condition for the sustainable development of industrial production and processing of polymer products is the transition to polymer materials based on renewable plant raw materials, in particular polylactides, polyhydroalkanates, etc. However, the technology for the production of these types of polymers is seriously inferior to synthetic polymers in the field of energy engineering. In this regard, research in the field of creating composite materials by introducing wood filler is currently particularly relevant. This research covers the results of stress-strain behavior of wood filled polylactic wood powder composite materials thermally modified by high temperatures ranged from 200 to 240 °С. Wood impact strength dependence is defined and static bending and composite density dependence on wood filler quantity and the temperature of its thermal modification is also established. It was specified that with the increasing of filler densification and its thermal treatment, the wood impact strength and composite density is decreasing, while with the reduced content of binding, the thermal modification of 200 °С has a positive impact on bending elastic coefficient. The conducted research allows identifying rational areas of use of composite materials as an effective factor in managing natural resources.

scholarly journals Effective chemical methods of fire control: new threats and new solutions

2019 ◽  
Vol 89 (5) ◽  
pp. 442-448
Author(s):  
S. D. Varfoloveev ◽  
S. M. Lomakin ◽  
P. A. Sakharov ◽  
A. V. Khvatov
Keyword(s):  
Flame Retardant ◽  
Flame Retardants ◽  
Raw Materials ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
The Novel ◽  
Fire Control ◽  
Renewable Raw Materials ◽  
New Type ◽  
Intumescent Flame Retardants

This paper discusses the prospective flame retardant systems for polymeric materials, while considering the environmental issues they create. Polymer nanocomposites with carbon nano-additives and layered silicates are presented as a new type of flame retardant system which exhibits a synergistic effect flame retardancy for traditional polymer thermoplasts. Particular attention is paid to the novel intumescent flame retardants based on the oxidized renewable raw materials, which can be successfully used in the manufacture of multi-purpose timber construction and polymer materials.

scholarly journals ANALYSIS OF PLASTIC WASTE RECYCLING METHODS

2021 ◽  
pp. 80-89
Author(s):  
Evgeniіa Mykhailova ◽  
Dmytro Deineka ◽  
Hanna Pancheva
Keyword(s):  
Waste Management ◽  
Raw Materials ◽  
Polymeric Materials ◽  
Waste Recycling ◽  
Plastic Waste ◽  
Chemical Recycling ◽  
Mechanical Recycling ◽  
Advantages And Disadvantages ◽  
Secondary Raw Materials ◽  
Plastic Waste Recycling

Methods of plastic waste management, the amount of which is constantly growing due to the high demand for polymer products with high performance properties, are considered. The urgency of the problem is explained by longevity of plastic, which, once in the environment, gradually degrades with the formation of substances dangerous to living organisms. The most common ways of plastic waste management are its storage on specially designated land plots or incineration with / without getting heat. Each of these methods has certain disadvantages, which necessitates the introduction of other measures. Recycling of plastic waste into secondary raw materials, energy or products with certain consumer properties can be the promising method of plastic waste management from ecological and economic points of view. The purpose of this work is to analyze the methods of plastic waste recycling, to establish their advantages and disadvantages, to determine the optimal ways for the disposal of polymeric materials with different properties. Two main groups of polymer recycling methods: physical and chemical, are considered. Physical method includes mechanical recycling, which is based on the physical grinding of plastic waste to obtain secondary raw materials without significant changes in the chemical structure of the material. This process is quite simple in terms of technical design, but requires careful sorting and cleaning of waste, and has limitations on the reuse of recycled material. Chemical recycling takes place through the processes of solvolysis (hydrolysis, glycolysis, alcoholysis) and conversion (pyrolysis, gasification). In this case, the plastic waste decomposes into the original molecules – monomers, from which it is possible to get a polymer product with the same properties. Chemical methods allow disposing of unsorted and contaminated polymeric materials many times without losing their quality. Thus, the introduction of the described methods will reduce the amount of plastic waste, turn them into valuable secondary raw materials and reduce using of natural resources used to obtain primary plastic materials.

Progress on the Preparation and Application of Mg (OH)2 as New Flame Retardants

2013 ◽  
Vol 320 ◽  
pp. 259-264
Author(s):  
Yuan Rui Wang ◽  
Feng Juan Liu
Keyword(s):  
Magnesium Hydroxide ◽  
Flame Retardants ◽  
Raw Materials ◽  
Development Prospect ◽  
Advantages And Disadvantages

The properties and the mechanism of flame retardants of magnesium hydroxide were discussed. The advantages and disadvantages of the methods are introduced to prepare magnesium hydroxide using the different raw materials. The modifying methods of magnesium hydroxide and application are summarized,and the development prospect of magnesium hydroxide is analyzed.

Effective Non-Autoclave Silicate Blocks of Casting Molding Process Based on Unconventional Aluminosilicate Raw Materials

2019 ◽  
Vol 974 ◽  
pp. 55-60
Author(s):  
A.A. Volodchenko ◽  
V.M. Vorontsov ◽  
I.A. Cherepanova
Keyword(s):  
Composite Materials ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Material Composition ◽  
Raw Material ◽  
Mineral Formation ◽  
Molding Process ◽  
Intensive Research ◽  
Problems And Solutions ◽  
Clay Rocks

Currently, intensive research is being conducted, both in Russia and abroad, to study the general principles, problems and solutions in the development of effective composite materials for construction purposes. It is shown that it is possible to use unconventional aluminosilicate raw materials represented by clay rocks of the incomplete stage of mineral formation as a raw material for the production of non-autoclaved silicate blocks of casting molding process. These raw materials due to the peculiarities of its material composition actively interact with the cementing component in non-autoclave conditions, with the formation of cementing compounds of the CaO-SiO2-Al2O3- H2O system, which provides high physical and mechanical performance of non-autoclave silicate products.

Evaluation of DNA Damage Induced by 2 Polybrominated Diphenyl Ether Flame Retardants (BDE-47 and BDE-209) in SK-N-MC Cells

2012 ◽  
Vol 31 (4) ◽  
pp. 372-379 ◽  
Author(s):  
Claudia Pellacani ◽  
Annamaria Buschini ◽  
Serena Galati ◽  
Francesca Mussi ◽  
Susanna Franzoni ◽  
...  
Keyword(s):  
Dna Damage ◽  
Comet Assay ◽  
Health Effects ◽  
Polybrominated Diphenyl Ethers ◽  
Flame Retardants ◽  
Diphenyl Ether ◽  
Human Neuroblastoma ◽  
Adverse Health Effects ◽  
Adverse Health ◽  
Bde 209

Polybrominated diphenyl ethers (PBDEs) are a class of flame retardants whose levels have increased in the environment and in human tissues in the past decades. Exposure to PBDEs has been associated with developmental neurotoxicity, endocrine dysfunction, and reproductive disorders. In spite of their widespread distribution and potential adverse health effects, only few studies have addressed the potential neurotoxicity of PBDEs. In the present study, we evaluated the cyto- and genotoxicity of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) and decabrominated diphenyl ether (BDE-209) in human neuroblastoma cells (SK-N-MC). The DNA damage was measured using the alkaline version of the Comet assay, while specific oxidative-generated DNA damage was evaluated by a modified version of the Comet assay with the repair enzyme formamidopyrimidine glycosylase (FPG). The results show that BDE-47 and BDE-209 (5-20 μmol/L) are able to induce DNA damage in human SK-N-MC cells. Pretreatment with the antioxidant melatonin significantly reduced the DNA damage induced by both congeners. The Comet assay carried out in the presence of FPG suggests that both congeners increase purine oxidation. In all cases, BDE-47 was more potent than BDE-209. The results indicate that 2 environmentally relevant PBDEs cause DNA damage which is primarily mediated by the induction of oxidative stress and may contribute to adverse health effects.

Hybrid polymer composite materials. Part 2. Preparation technology

2020 ◽  
pp. 8-13
Keyword(s):  
Composite Materials ◽  
Impact Toughness ◽  
Polymer Composites ◽  
The Other ◽  
Polymer Materials ◽  
Hybrid Polymer ◽  
Preparation Technology ◽  
Advantages And Disadvantages ◽  
Hybrid Polymer Composite ◽  
The One

The main methods (pressing and winding) of the processing of hybrid polymer composites to obtain items were examined. Advantages and disadvantages of the methods were noted. Good combinations of different-module fibers (carbon, glass, boron, organic) in hybrid polymer materials are described, which allow one to prepare materials with high compression strength on the one hand, and to increase fracture energy of samples and impact toughness on the other hand.

Bamboo Waste-based Bio-composite Substance: An application for Low-cost Construction Materials

2020 ◽  
Vol 4 (1) ◽  
pp. 41-48
Author(s):  
Teodoro Astorga Amatosa ◽  
Michael E. Loretero
Keyword(s):  
Composite Materials ◽  
Sea Water ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Single Layer ◽  
High Strength ◽  
Green Technology ◽  
Experimental Medium ◽  
Natural Treatment

Bamboo is a lightweight and high-strength raw materials that encouraged researchers to investigate and explore, especially in the field of biocomposite and declared as one of the green-technology on the environment as fully accountable as eco-products. This research was to assess the technical feasibility of making single-layer experimental Medium-Density Particleboard panels from the bamboo waste of a three-year-old (Dendrocalamus asper). Waste materials were performed to produce composite materials using epoxy resin (C21H25C105) from a natural treatment by soaking with an average of pH 7.6 level of sea-water. Three different types of MDP produced, i.e., bamboo waste strip MDP (SMDP), bamboo waste chips MDP (CMDP) and bamboo waste mixed strip-chips MDP (MMDP) by following the same process. The experimental panels tested for their physical-mechanical properties according to the procedures defined by ASTM D1037-12. Conclusively, even the present study shows properties of MDP with higher and comparable to other composite materials; further research must be given better attention as potential substitute to be used as hardwood materials, especially in the production, design, and construction usage.

Possibilities of using biodegradable polymeric materials in the agricultural sector

2020 ◽  
Vol 67 (2) ◽  
pp. 115-120
Author(s):  
Raisa A. Alekhina ◽  
Victoriya E. Slavkina ◽  
Yuliya A. Lopatina
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Agricultural Sector ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Limiting Factors ◽  
Research Purpose ◽  
Biodegradable Materials ◽  
Advantages And Disadvantages

The article presents options for recycling polymers. The use of biodegradable materials is promising. This is a special class of polymers that can decompose under aerobic or anaerobic conditions under the action of microorganisms or enzymes forming natural products such as carbon dioxide, nitrogen, water, biomass, and inorganic salts. (Research purpose) The research purpose is in reviewing biodegradable materials that can be used for the manufacture of products used in agriculture. (Materials and methods) The study are based on open information sources containing information about biodegradable materials. Research methods are collecting, studying and comparative analysis of information. (Results and discussion) The article presents the advantages and disadvantages of biodegradable materials, mechanical properties of the main groups of biodegradable polymers. The article provides a summary list of agricultural products that can be made from biodegradable polymer materials. It was found that products from the general group are widely used in agriculture. Authors have found that products from a special group can only be made from biodegradable polymers with a controlled decomposition period in the soil, their use contributes to increasing the productivity of crops. (Conclusions) It was found that biodegradable polymer materials, along with environmental safety, have mechanical properties that allow them producing products that do not carry significant loads during operation. We have shown that the creation of responsible products (machine parts) from biodegradable polymers requires an increase in their strength properties, which is achievable by creating composites based on them. It was found that the technological complexity of their manufacture and high cost are the limiting factors for the widespread use of biodegradable polymers at this stage.

Sign in / Sign up

Export Citation Format

Share Document