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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Chapter 1 INTRODUCTION Wine is an alcoholic beverage produced through the partial or total fermentation of grapes‚ other fruits and plants such as berries‚ apples‚ cherries‚ dandelions elder berries ‚ palm and rice can also be fermented. Grapes belong to the botanical family vitaceae of which there are many species. The species that are most widely used in wine production are Vitislabrusca and specially Vitisvinefara‚ which has long been the most widely used wine grape throughout the world
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In the IUPAC system of nomenclature‚ functional groups are normally designated in one of two ways. The presence of the function may be indicated by a characteristic suffix and a location number. This is common for the carbon-carbon double and triple bonds which have the respective suffixes ene and yne. Halogens‚ on the other hand‚ do not have a suffix and are named as substituents‚ for example: (CH3)2C=CHCHClCH3 is 4-chloro-2-methyl-2-pentene. If you are uncertain about the IUPAC rules for nomenclature
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known or accepted value. METHODOLOGY I. Materials 50-mL graduated cylinder 125-mL flask Electronic balance Block of wood Watch glass 25 centavos coin Tongs 10.00 mL pipet Pipet bulb Metric ruler Distilled water Liquid sample (Ethyl acetate) II. Procedure A. Density of Water 1. Weigh a clean dry graduated cylinder. 2. Add exactly 20 mL Distilled Water in the graduated cylinder. 3. Weigh the graduated cylinder with Distilled water. 4. Make sure that all the data are recorded
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significant effect on C=O strength hence low energy absorption. Preparation of- Manganese(III) tris(acetylacetonate) Abstract In this experiment Manganese (III) tris (acetylacetonate) - [MnIII(acac)3] is prepared using manganese chloride‚ sodium acetate and acetylacetone‚ further analysis were done to find the percentage of manganese in complex. Introduction Manganese is a first row transition metal that has a range of oxidation states that appear in its compounds. The most common oxidation states
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Eugene Posniewski English 10-1 Ms. Foley 22 January 2010 What is Pedophilia? Pedophilia is a paraphilia that involves an abnormal interest in children. A paraphilia is a disorder that is characterized by recurrent intense sexual urges and sexually arousing fantasies generally involving: nonhuman objects; the suffering of humiliation of oneself or one’s partner; or animals‚ children‚ or other nonconsenting persons. Pedophilia is also a psychosexual disorder in which the fantasy or actual
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b) 17.3 c) 12.2 d) 15.8 e) 7.0 3. The Ka of acetic acid is 1.8 x 10-5. What is its pKa? a) 1.8 x 10-5 b) 5.18 c) 4.74 d) -4.74 4. What is the pH of a 0.100 M solution of acetic acid? a) 1.34 x 10-3 b) 2.87 c) 1.00 d) 4.74 e) 3.74 5. What is the acetate ion (Ac- or CH3COO-) concentration of the solution in Problem #4? a) exactly zero b) 3.74 M c) 0.100 M d) 1.34 x 10-3 M e) 1.8 x 10-6 M 6. What is the percent ionization of the acetic acid in Problem #4? a) 1.34% b) 0.134% c) 0.0014% d) 1.8 x 10-5
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CH3COOH Assay of Aspirin capsules Aqueous Alkalimetry Residual titration 0.1N NaOH Phenolphthalein TS C6H4OCOCH3COOH + NaOH C6H4OCOCH3COONa+ H2O Assay of Metacholine Chloride Non Aqueous Acidimetry Blank titration Perchloric acid Mercuric acetate TS Crystal violet TS 2 Cl- + Hg (OAC)2 + 2HClO4 2 ClO4- + 2HOAc + 2HgCl2 Assay of Phenytoin Non Aqueous alkalimetry Blank titration Sodium methoxide Saturated sol’n of Azo violet in Benzene H C6H5 N--C=O
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Neroli essential oil is gotten from the flowers of the bitter orange tree‚ which belongs to the citrus family. Neroli oil is extracted through the distillation method. Neroli essential oil gibes off aroma that appears to be a blend of sultry floral with a touch of earthly wood. Bitter orange‚ which serves as the source of neroli essential oil is majorly grown in Eastern Africa‚ Western India and Himalayas. However‚ during the mid-1500s‚ the bitter orange tree was taken to St. Augustine‚ Florida by
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“Road salt” is a common term used for some chloride salts‚ including sodium chloride (NaCl)‚ which are used as de-icing agents on roads. The application of these de-icers on roads and other impervious surfaces in North America during winter months was in practice since the 1960s. The amount of snow fall is so high in these areas that snow and ice management becomes very essential to prevent road accidents‚ to maintain a continuous flow of traffic and to ensure safe pedestrian travel during winter
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