Flame retardant properties Chemically all polymeric materials comprise of hydro-carbon chains and usually have high heat of combustion. When they are exposed to fire, they burn rapidly with the release of high amount of heat, flame and smoke. Similarly the natural fibers, wood flour, are highly combustible and burn rapidly. So for safely use of the composites materials they must have flame retardant properties as well. The burning of the materials is a complex process. Combustion of any material requires three components: heat, oxygen and combusting material or fuel. When heat is applied to the composites materials, temperature of the materials increases. At particular temperature, pyrolysis temperature, materials start to decompose, and produce …show more content…
It was found that ATH can help to improve the flammability of HDPE composites in decreasing of heat release rate, total heat release and mass loss rate. With addition of inorganic flame retardants including RP and EG, the ATH flame retarded HDPE composites show obvious synergistic effects in improving the flame retardancy [72]. Sun L. et al studied the thermal stability and fire retardant properties of wood flour/polypropylene composites containing magnesium hydroxide (MH), expandable graphite (EG), and ammonium polyphosphate(APP) as flame retardant. The results showed that both expandable graphite and ammonium polyphosphate promoted thermal degradation of wood flour and char formulation, and magnesium hydroxide did not influence on the wood flour decomposition. Cone calorimeter results indicated that EG showed the best properties on fire retardant and suppression smoke …show more content…
For best performance in flame retardancy without deteriorating the mechanical properties (tensile strength), the optimum ratio of APP/MEL was found to be 3:1 with loading of 30%. Besides this the incorporation APP and/or APP and MEL into composites promoted the char formation and correspondingly improved the thermal stability [79]. Z Qin et al modified ammonium polyphosphate (APP) and compared the effect of modification on flame retardant properties of polypropylene along with dipentaerythritol (DPER). The incorporation of modified ammonium polyphosphate (IMAPP) with dipentaerythritol (DPER) at 25 % loading produced LOI 32% with V-0 rating while unmodified APP had LOI 26% and V-1 rating. IMAPP also significantly decreased the PHRR and THR and contributed to the formation of compact intumescent
Thousands upon thousands of acres are lost in forest fires every year. We always hear about the dramatic losses caused by forest fires and are often concerned by them. There are so many horrible effects from fires and most of them affect so many people. Studies have shown that out of all of the different methods to decrease fire damage, prescribed burns are the most affective. Many people would argue that they are not as affective because they cause so many health problems. Although that is a very important view and may seem valid, those health issues are not as extreme as one might think. People should look at the majority of the benefits form prescribed burns and they will see how affective and important they are. Prevention is the key to society these days and is definitely an important factor in saving lives. If more lives can be saved as well as land and wildlife, prescribed burns may be the better way to go about forest fires. Although, prescribed burns are better for the environment in order to prevent drastic forest fires, severe damage to timber and extreme death of wildlife; some people feel it affects the health of a firefighter too much and it causes too many long term effects.
Combustion is a rapid, continuous reaction that usually takes place in the gas phase. Wood is an organic compound primarily comprised of cellulose. For wood, the phase change from a solid to gas is almost instantaneous as combustion occurs (Coleman, et al. 95). Ignition occurs when an outside source is no longer needed to sustain combustion (Coleman, et al. 87).
The MSDS, or material safety data sheet, for 2-butoxyethanol outlines basic health risks that accompany it, along with basic chemical and physical properties. One of the physical properties is the fact that it is a liquid at room temperature, which means it takes the shape of its container and its molecules are not definitively packed. Chemical properties include flammability, which is whether or not it ignites easily, and toxicity, whether or not it is poisonous to humans. 2-butoxyethanol is both flammable and toxic, meaning it does ignite easily and is poisonous to humans It says that 2-butoxyethanol has a health hazard number of two and fire hazard number of two. The health hazard number means that it can cause injury upon exposure and requires rapid medical treatment. The fire hazard number means that it can ignite w...
oxygen, and cannot be smothered. If you start a chemical fire indoors, it can be
Prescribed fires are a well debated topic. While many people support them because they "help prevent" more wildfires, and they are "controlled," I see from a different point of view. There's a reason most building don't allow smoking within a certain distance of the building. Many people don't like it and it can damage their health. Same thing with prescribed fires. They add more pollution to the air we breathe. I know a lot of people support these kinds of fires because the help control fuels, but there are other ways.
The most common form of polyethylene is petroleum based or olefins based; as before mentioned polyethylene compounds have a wide commercial applicability and are made from non-renewable resources (Harding, Dennis, von Blottnitz, Harrison, & S.T.L., 2007). Its manufacturing processes are regarded as energy intensive and release significant amount of CO2 and heat into the atmosphere (Broderick, 2008). Next a little more detailed description of polyethylene’s production processes will be presented, with a focus on the way the material inputs are extracted and synthesized.
Polyethylene (PE) is one of the most commonly used polymers which can be identified into two plastic identification codes: 2 for high-density polyethylene (HDPE) and 4 for low density polyethylene (LDPE). Polyethylene is sometimes called polyethene or polythene and is produced by an addition polymerisation reaction. The chemical formula for polyethylene is –(CH2-CH2)n– for both HDPE and LDPE. The formation of the polyethylene chain is created with the monomer ethylene (CH2=CH2).
Forest fires kill many animals and usually destroy a large amount of land. Prescribed burns seem like they would be the best idea, but are they? Their claim to fame is to clear out land in order to decrease the burning space for when an actual forest fire occurs. Yet this may seem like a brilliant idea, but one must look at the negative aspects of controlled burnings. People might have a change of heart when they realize the damages and effects of such an interesting act. Keep in mind that not only is your health involved but even such things as the inconvenience of dealing with a smoky town. It is important to understand that prescribed burns cause severe health problems especially to firefighters; these are concerning carbon monoxide poisoning, visibility issues and health risks that will affect the future.
Imagine you are asleep and it is a normal night just like any other, when all of a sudden you smell smoke from your bedroom. Immediately, you open your door and you cannot see anything due to the heavy layer of smoke. Your first reaction is to call the fire department and within minutes, they show up at your house. Some firefighters start battling the flames engulfing your house, while others rush into the flames searching for you and anyone else in your family, including your pets. This is just another day at the office for the firefighters but for you it’s a traumatic event and you can’t thank the firefighters enough for saving your life.
German Chemist Hans von Pechmann first synthesized Polyethylene by accident in 1898 by heating diazomethane. His colleagues characterized the waxy substance polyethylene due to the fact that they recognized that it consisted of long ethene chains. It was then first industrially synthesized by accident in 1933 by applying extremely high pressure to ethylene and benzaldehyde. Over the years, development of polyethylene has increased due to the additions of catalyst. This makes ethylene polymerization possible at lower temperatures and pressures.1
Composite materials are simply materials created by combining two or more materials with different properties to produce a final material with unique qualities. The materials are not blended or dissolved together they remain separate in the final composite structure. Composite materials can be fabricated to have specific characteristics depending
Arson is one of the oldest crimes recognized throughout the world. It is defined as the intentional and malicious burning of a structure or building (Montaldo). Arson can cost the lives of individuals and the damages can be costly. In 2010, there were about 260,600 fires (“Arson and Intentional Fires,” n.d.). Many of these fires were intentionally set. These fires have resulted in an estimated 390 deaths, 1,340 injuries, and $1.2 billion in damages (“Arson and Intentional Fires,” n.d.). Most of the fires have occurred outside, but most of the deaths, injuries, and losses occurred in structures, particularly in homes (“Arson and Intentional Fires,” n.d.). Arson is considered to be a property crime to law enforcement agencies, despite that the fires created by the arsonist can injure and kill many people. This paper will discuss the history of arson as well as explaining why arson is difficult to prove, why people commit it, and also provides specific case examples and suggestions on what people can do to reduce the risk of arson.
Hazardous material is any material that may cause hazard to human health or environment. Hazardous material can be solid, liquid or gas. There is 9 classes of hazardous material are known in the United Nation. The solid hazardous material can cause hazard to human by contacting or by dust form so the human will inhale it. The liquid hazardous material can cause hazard to human by flowing into draining system and waterways so it will affect the person by the drinking water and it will also affect the wildlife. There is 2 main ways that hazardous material can get in human body and cause harm, one of them is inhalation so it will damage the lungs and respiratory system, and also ingestion so the material will enter the body with the food or water and it will damage the digestive system.
Polyethylene terephthalate is used as textile fibres and we know them by the following names Terylene, and Dacron, to name two. It consists of a synthetic polymer that is made out of a purified terephthale acid or its dimethyl ester, dimethyl terephthalate and mono ethylene glycol. Today 18% of the market shares of all plastic materials produced is polymers from dicarboxylic acid and a diol. There are many applications and depends on the production and orientation of the polymer chains. Also used in textiles and food packaging, maybe you will recognise the trivial name, polyethylene terephthalate, PET. The annual production is about 40 million tonnes; of this 40 million tonnes 65% is for fibres production, 5% for film production, and 30% for packaging material. These polymers do not discolour in light and their melting point is high
Firefighting has been a thankless job since the beginning. It started out as a group of people with one objective; to extinguish a fire. They did not worry about the consequences or repercussions from not having any personal protective equipment. The equipment to help keep all firemen safe has drastically changed from being non-existence to the upmost importance. Without safety equipment, firemen cannot perform their job to the best of their ability. Firemen use turnout gear which has three major parts; helmet, jacket, and SCBA.