File Name: bakelite preparation properties and uses .zip
- preparation of Bakelite
- preparation of Bakelite
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- CAMPUSplastics | datasheet Bakelite® X 22
When phenol C6H6O , which is an organic compound and a common disinfectant, is mixed with … It must be mounted onto bakelite puck, polished using finer and finer grits as well as polishing slurry, and finally it … Water molecule is removed in the process. Making Bakelite is a multi-stage process. Water molecule is removed in the process. Preparation of bakelite: Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde.
preparation of Bakelite
View Datasheet in another language. All information, recommendations and suggestions provided by Bakelite AG in the form of verbal or written communication, or in pertinent data bases, represent our best knowledge and experience. Such data are non-binding in character, and do not represent, either explicitly or implicitly, assurances or a guarantee of specific properties. The specified parameters merely represent typical data; they do not form a basis for either a guarantee or a specification. The information, recommendations and suggestions we provide describe our products and possible applications in general or exemplary terms; they do not relate to specific cases. The process of constant continued development and improvement of our products can lead to changes in pertinent parameters, texts and illustrations; no special mention is made of possible alterations. Our technical advice does not free the customer of its responsibility to verify our current information, in particular our technical data sheets, safety data sheets and technical information leaflets.
Bakelite , trademark of phenol-formaldehyde resin , trademarked synthetic resin invented in by Belgian-born American chemist Leo Hendrik Baekeland. A hard, infusible, and chemically resistant plastic , Bakelite was based on a chemical combination of phenol and formaldehyde phenol-formaldehyde resin , two compounds that were derived from coal tar and wood alcohol methanol , respectively, at that time. This made it the first truly synthetic resin, representing a significant advance over earlier plastics that were based on modified natural materials. Because of its excellent insulating properties, Bakelite was also the first commercially produced synthetic resin, replacing shellac and hard rubber in parts for the electric power industry as well as in home appliances. In the s it was widely used in knobs, dials, circuitry panels, and even cabinets for radios, and it was also employed in the electrical systems of automobiles. In the s cast Bakelite, along with many other competing phenolic resins, enjoyed a vogue in colourful costume jewelry and novelties.
These solutions for Synthetic Fibres And Plastics are extremely popular among Class 8 students for Science Synthetic Fibres And Plastics Solutions come handy for quickly completing your homework and preparing for exams. Which of these is a natural fibre? They can be spun into filaments, threads or ropes. Cotton fibre is almost pure cellulose that grows in a protective capsule around the seeds of cotton plants. Which of these is a fibre derived from chemicals? They do not occur naturally but are produced entirely in chemical plants or laboratories.
preparation of Bakelite
It is a thermosetting phenol formaldehyde resin , formed from a condensation reaction of phenol with formaldehyde. Bakelite was patented on December 7, The creation of a synthetic plastic was revolutionary for its electrical nonconductivity and heat-resistant properties in electrical insulators, radio and telephone casings and such diverse products as kitchenware, jewelry, pipe stems, children's toys, and firearms. In recent years the " retro " appeal of old Bakelite products has made them collectible. Bakelite was designated a National Historic Chemical Landmark on November 9, , by the American Chemical Society in recognition of its significance as the world's first synthetic plastic. Baekeland was already wealthy due to his invention of Velox photographic paper when he began to investigate the reactions of phenol and formaldehyde in his home laboratory. Chemists had begun to recognize that many natural resins and fibers were polymers.
Very smooth molding can be obtained from this polymer. Bakelite moldings are heat-resistant and scratch-resistant. They are also resistant to several destructive solvents. Owing to its low electrical conductivity, bakelite is resistant to electric current.
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This reaction is highly exothermic, but that is not why the plastic produced is referred to as "thermoset". Bakelite is a space-network polymer. Unlike linear and branched polymers, which are composed of long molecules that make them more or less crystalline, space-network polymers are highly and irregularly cross-linked throughout the structure. The sheer extent of the cross-linking means that a sample of the material is essentially one gigantic molecule.
Harmful: Dilute acetic acid, in the form of vinegar, is harmless. However, ingestion of stronger solutions is dangerous to human and animal life. It can cause severe damage to the digestive system, and a potentially lethal change in the acidity of the blood. Flammable: Concentrated acetic acid can be ignited with difficulty in the laboratory.
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CAMPUSplastics | datasheet Bakelite® X 22
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Тебе пора отправляться домой. - Он перевел взгляд на схему. - Там темно как в преисподней! - закричала. Джабба вздохнул и положил фонарик рядом с. - Мидж, во-первых, там есть резервное электроснабжение. Так что полной тьмы быть не .
Uses. It is the most widely used plastic. It has high rigidity and chemical bakelite. CH2. CH2. OH. OH. Properties. These phenolic resins are rigid, hard, water.