Forensic polymer engineering Essays

I chose the job as a forensic chemist. The forensic chemist help solve crimes by gathering physical evidence and analyzing it in a lab. The types of evidence they find are from fibers, paints, glass, and stains. They use a lot of different technologies like microscopy and gas chromatography. The average salary is from 27,683 to 52,471 dollars a year. Forensic chemists usually work in a laboratory setting and they often go standing for long periods of time with a lot of technical equipment. They

Avery Casaclang Ms. Prasad Chemistry 11 15 June 2023 Why Cosmetic and Food Chemists Intertwine with Forensic Scientists A similarity between forensic, cosmetic, and food scientists is that they all work in the field of chemistry in some form. All three careers require a solid chemical background, often including laboratory work and advanced analytical techniques. These experts frequently work with other scientists, engineers, and researchers to solve particular/specific problems and guarantee the

Polyester Fibres Indtroduction: Polyester are polymers made by a condensation reaction taking place between small molecules, in which the linkage of the molecules occurs through the formation of estes groups. Polyesters are commonly made by interaction of a dibasic acid with a dihydric alcohol: HOOC-X-COOH+HO-Y-OH OC-X-COO-Y-OCO-X-COO-Y-OCO The formation of polyester was studied by Wallace H. Carothers of du Point during the investigation of polyesters which lead eventually to the

WINDSHIELD REPAIR: WHAT IS IT? Your vehicle's windshield is composed of three layers: two pieces of glass separated by a thin layer of "PVB" (polyvinyl butyrate). PVB is the plastic film that essentially holds it all together. Depending on the density of the outer-layer and the force of a rock impact, the glass can flex and break. Unless the windshield is completely shattered, most often the damage is in the form of a rock chip. These are generally in the shape of a star, bullseye, or tiny crack

Question 1 Question Topic: A1 – Identification of Materials – Physical Characteristics Question: Given the Monomer Unit structure below answer the following: A: Name the plastic relating to it B: Write the density for both amorphous and crystalline (in g/cm^3) C: List 2 things commonly made with it. D: CALCULATE the molecular weight of polypropylene (g/mol) Answer: The plastic relating to the monomer structure above is Polypropylene. (PP) Polypropylene is one of the lower density fibers. The

Part 2 of the laboratory hypothesizes that different PEG precursor combinations will have an effect on the modulus of the material due to the differences in mesh structure. Unlike part 1, part 2 focuses on variation in mesh structure due to the polymerization of 2, 4, and 8 arm PEGnorb with 2 and 4 arm PEG thiol, rather than the impact of polymerization time. Table II displays the precursor combinations, the resulting hydrogel modulus, and the mesh size of experimental groups 1-2, 4-5, and 7-8. Figure

atoms, hexamethylenediamne and adipic acid (figure 1.), which give nylon 66 its name. This specific type of nylon was invented by Wallace Carothers at DuPont’s research facility on the 28th of February, 1935. Properties of this polymer that make it the best polymer suited for fishing line includes: high elasticity, high tensile strength, cheap to produce and its resistance to abrasions and chemicals in the water. Nylon 6,6 is one of the newer materials used for making fishing lines however, many

DYEING Dyes are coloring materials used in dyeing textiles. Other hand it can be defined as a substance which may be natural or synthetic use to change or add color to the textile materials. They are incorporated into the fiber by chemical reaction, absorption, or dispersion. Dyes differ in their resistance to sunlight, perspiration, washing, gas, alkalizes, and other agents; their affinity for different fibers; their reaction to cleaning agents and methods; and their solubility and method of application

group of biodegradable polymer that covers both specialties in the biomedical field and commodity applications. These polymers have amide and ester groups on their chemical structure which give good thermal and mechanical properties. Polyesteramides are polymers with hydrolysable backbones which able to biodegrade under particular conditions. Strong hydrogen bonding interactions between amide groups back up some typical weakness of aliphatic polyester. The properties of polymer like hydrophilic or hydrophobic

At room temperature is a colorless gas with an odor similar to gasoline. It is an alkene used to manufacture rubber by addition polymerization. It has two C-C double bonds in its structure which allows the compound to form a wide variety of polymers including ABS. This compound is a toxic gas listed as a human carcinogen. Figure 2. Representation of 1.3-butadiene (mw: 54.09 g/mol) Styrene: A colorless to yellowish liquid that produce polystyrene by homopolymerization. Styrene is a derivative of

High-grade jacket materials such as polyurethane (PUR) should be considered. PUR is resistant to harsh conditions such as oils, fire, abrasions and chemicals. Lower grade jacket materials, such as PVC, while less expensive cannot handle exposure to oils and chemicals and might degrade. PVC also becomes brittle and cracks at low temperatures. Material selection can be dependent on the material’s electrical, mechanical and environmental capabilities and the ease with which they can be attached to

Loubani1 Reem Loubani Mrs. Dina Daher Chemistry Sunday December 25th, 2016 Plastic Synthesis Polymers are large molecules composed of smaller molecules called monomers. Polymers are found almost everywhere around you. Some of them are naturally occurring, such as proteins, starch, silk, and wool, while others, such as nylon, Teflon, and plastics, are synthesized in labs to yield important products. Plastic is a material widely known by people; it is used in an enormous range of products

INTRODUCTION New product innovation using polymer based materials to be introduced is polymer opal apparel. The polymer opal apparel is absolutely not typical clothes because it has its own uniqueness and attraction due to the materials used to produce this product. Polymer opal apparel using polymer based materials which are spandex fibres and polymer opal. Uniqueness and advantages of polymer opal apparel is that it has an appearance in which the colour is changing due to strain, pressure and movement

acid(PLA) is a biodegradable polymer used in many biomedical as well as in packaging Applications. Conventionally, PLA is produced by two method which is direct condensation of lactic acid and ring opening polymerization. The polymer produced from these conventional methods produced polymer which have low molecular weight. Conventional methods of PLA production requires catalyst which makes it unfit for biomedical Applications. Newer method utilizes metabolic engineering for direct production of PLA

Ergodyne Chill-Its 6710 Evaporative Polymer Cooling Dew Rag is another product from the Chill-its range. It is high-absorbing cooling towel which can be converted into a headband and headgear. This product is popular in the market with its super feature of acrylic polymer crystals which are highly evaporative. It helps in absorbing the water and sweat to evaporate it and provide cooling effects. This cooling effect in turn cools the body part where this cooling towel is used; be it head, hand, shoulder

Polyvinyl chloride is obtained by chain polymerization. Double bonds of vinyl chloride monomer get opened up. Since monomers possess a double bond between two of their carbon atoms in their structures, those get activated in the presence of tiny concentrations of starters. In this way, double bonds get open and monomers react rapidly so they associate with each other by forming macromolecules chains. Polyvinyl chloride polymerization is a highly exothermic reaction, where a high amount of heat is

anhydride with ethylene glycol. Due to the fact that both of these components have only two functional groups, the polymer chain is linear. As shown in Picture 1 above, the product formed from the reaction is a solid and resulted in a dark color change. The solid structure is form after cooling and the color change represented the presence of a reaction. As shown in Table 1, the linear polymer was not brittle and was not viscous after cooling. The cross-linked polyester with thermosetting properties was

the underlying structures through the cells. Therefore, the cells are interconnected. This type of structure is called as bicontinuous nanoporous structure: two continuous phases are the polymer matrix and air pores. Homogeneous PSU-CO2 mixture separates into two continuous phases: PSU-rich phase (i.e., polymer matrix) and CO2-rich phase (i.e., voids). Although both cellular structures are bicontinuous nanoporous, and cell size and relative density are also similar, they seem to have different morphologies

1.1. Polyesters Polyesters are the polymers that contain ester functional group in their main chain. The polyesters can be classified according to the composition of their main chain as aliphatic and semi-aromatic in addition to aromatic polyesters. Also can be thermoplastic or perhaps thermoses. All common polyesters are thermoplastics (Rosato, L. et al. 2004).According to the composition of their main chain; polyesters can be classified as shown in table 1. 1.1. 1. Aliphatic polyesters Aliphatic

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