Polymer chemistry Essays

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

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

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

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

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

Metabolic engineered of biocatalyst: A solution for PLA based problems ABSTRACT Poly lactic 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

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

brown-black polymer of dihydroxyindole carboxylic acids, and their reduced forms. All melanin are derivatives of polyacetylene. There are three major types of melanin; Eumelanin (black or brown), Pheomelanin (yellow-red) and all melanins. The most common melanin is a Eumelanin which is also known as DOPAmelanin, it is a mixed copolymer of polyacetylene, polyaniline, and polypyrrole. Another common form of melanin is pheomelanin, a red-brown polymer of benzothiazine

First and foremost, the claim is hardship in war period. In the painting, a man is plowing soil with the help of two horses. The man probably is not a farmer as his cloth is neat, clean and still in a good condition which is not like other farmers who usually are dirty and messy. The man might be forced to be a farmer to earn a living to support his family after his property was taken away by the authority for military expenditure as there is quite a number of soldiers are hiding in between the ploughed

Have you ever wondered what living objects were made up off? How food is digested? No not by cells, but those catalysts that break down substances. They are called enzymes. Enzymes are biological molecules, proteins, which act as catalysts and help complicated reactions occur everywhere in life. Enzymes are very precise catalysts that usually work to complete one assignment. Example being; an enzyme that helps digest proteins will not be useful to break down carbohydrates. Also, you will not find

Glycidoxypropyltrimethoxysilane (GPTMS) and Bis (3-trimethoxysilyl-propyl) amine (Dynasylan 1124 ®) are provided by Evonik Industries, USA. Heloxy Modifier 65® (EEW=230) and epoxy resin (EPON 828 ®, EEW=188) are supplied with Momentive, USA. Isophorone diisocyanate (IPDI) is supplied by Bayer Material Science. Colloidal silica Ludox HSA is provided by Grace Davison. Brulin 815 GD is obtained from Brulin & company Inc. Mercaptanbenztriazol (MBT) (corrosion inhibitor) and all other chemicals and solvents

Polystyrene (PS). 2016. 6 11 2017. (-- removed HTML --) . Kielmas, Maria. Advantages & Disadvantages of Polymer Composites. 26 september 2017. 6 11 2017. (-- removed HTML --) . Linear, Branched, and Cross-linked Polymers. n.d. 6 11 2017. (-- removed HTML --) . Polystyrene. 2017. 6 11 2017. (-- removed HTML --) . supramolecular. n.d. 6 11 2017. (-- removed HTML --) . Supramolecular chemistry. 24 october 2017. 6 11 2017. (-- removed HTML --) . synthetic. 2017. 6 11 2017. (-- removed HTML --)

Karen L. Wooley is a great example of an individual that uses chemistry everyday in her life. She is a very prosperous professor who is very well off, she lives in a mansion and owns a luxurious Maserati. Professor Wooley opened my eyes to a potential new path I could take due to the fact that she is very well off and successful. She delivered a very interesting lecture titled, ““Sophisticated Nanoscopic Macromolecules.” She began by introducing the role of chemists in the world, and how they

The article written by Brian Rohrig titled, NASCAR: Chemistry on the Fast Track, released in the February 2007 issue of ChemMatters, tackles the interesting challenge of relating racing to chemistry. Throughout the article, Brian uses the technology and equipment utilized in the sport to draw connections between the general field of chemistry and NASCAR, a famous North American racing series, whilst explaining the general rules and regulations unique to the NASCAR series. Many individuals today

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

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

The chemistry of heterocycles compounds is one of the most complex branches of chemistry. It is equally interesting for its theoretical implication for the diversity of its synthetic procedure and for the physiological and industrial significance. Synthetic heterocycles chemistry has influenced almost every place of human life and the heterocycles compounds have found their application in diverse fields medicine, agriculture, polymer, and various industries. Synthetic

For the last 5 decades, electronics coupled with organic chemistry has been an area of great research interest, especially in physics and chemistry. Until a few years ago, this topic was thought to have no practical approach and was believed to be just research-oriented. Modification of chemical structures so that they can in a way enhance the properties of these when used for electronic applications- especially as a thin film has gained major impetus. It was always thought that organics would soon

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