I. Lubricants selection and Application A.Viscosity Most important property of any lubricant is viscosity. A common mistake when selecting a grease is to confuse the grease consistency with the base oil viscosity. Because the majority of grease-lubricated applications are element bearings‚ one should consider viscosity selection for those applications. While most would not use an EP 220 gear oil for an oil-lubricated electric motor bearing‚ many people will use a grease containing that same oil
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said problem which a lot of researchers are working on to find the remedy for the planet’s major problem. A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass‚ but they often contain other substances. They are usually synthetic‚ most commonly derived from petrochemicals‚ but many are partially natural. Most plastics are derived from propylene‚ a simple chemical component of petroleum
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ABSTRACT For many years‚ the use of natural polymers for the fabrication of packaging materials has been an interesting alternative to replace non-biodegradable polymers which are normal components of these materials. The core problem of these starch based plastics is their hydrophilic character and the fact that they tend to become brittle with ageing. Unmodified starch is too much hydrophilic to be used as food packaging material. Chemical modification must be carried out in order to make them
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consideration for their ultimate disposability or recyclability. This has resulted in mounting worldwide concerns over the environmental consequences of such materials when they enter the waste stream after their intended uses‚ Of particular concern are polymers used in single use‚ disposable plastic applications. Plastics are strong‚ light-weight‚ inexpensive‚ easily process able and energy efficient. They have excellent barrier properties. They are disposable‚ and very durable. However‚ it is these
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colloidal delivery system. Hydrogels: Hydrogel is a colloidal gel in which water is the dispersion medium. It (also called aquagel) is a network of polymer chains that are hydrophilic‚ sometimes found as a colloidal gel in which water is the dispersion medium. Hydrogels are highly absorbent (they can contain over 99% water) natural or synthetic polymers. Hydrogels also possess a degree of flexibility very similar to natural tissue‚ due to their significant water content. These hydrogels have the ability
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A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass‚ but they often contain other substances. They are usually synthetic‚ most commonly derived from petrochemicals‚ but many are partially natural.[1] A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass‚ but they often contain
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eXPRESS Polymer Letters Vol.3‚ No.6 (2009) 366–375 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2009.46 Starch-based completely biodegradable polymer materials D. R. Lu‚ C. M. Xiao*‚ S. J. Xu College of Material Science and Engineering of Huaqiao University‚ Quanzhou‚ 362021‚ P. R. China Received 21 February 2009; accepted in revised form 30 March 2009 Abstract. Starch is a natural polymer which possesses many unique properties and some shortcoming simultaneously
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Exercise 1 Polymers – An introduction to Organic Chemistry Group 3 Jude Marchoni C. Tampus Meryl Marie Susan Chua Pearl Pontillas Paolo Pepito Gaia Casas I. Abstract: (Paolo) In this experiment we will be testing what would happen to the polymer when we add borax to it. A polymer is a compound made up of large molecules often in a solid state. Polymers are chemically formed by 100 to 10‚000 small molecules called "monomers". Monomers occur in molecular units or patterns
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CHEMICAL INDUSTRY The chemical industry comprises the companies that produce industrial chemicals. It is central to modern world economy‚ converting raw material (oil‚ natural gas‚ air‚ water‚ metals‚ and minerals) into more than 70‚000 different products. The chemical industry is a key contributor to the world economy. It is a knowledge-based industry with significant investments in R&D. The industry supplies to virtually all sectors of the economy. In terms of consumption‚ the chemical industry
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quality of the bioplastic product‚the researchers used okra wherein mucilage can be found which lessens the brittleness of the said product because of the so called‚ glycirin. Another concerned material in the study is cornstarch. It is the source of polymer which is said to be the building blocks of the eco-friendly plastic product. What makes this study different is that the researchers used raw materials which are seldomly used in a more different way and utilize it to make a new product which could
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