Polymer

Slime was first created in 1976 by mattel ( A toy company) it was sold in little green trash cans. It was not stretchy or soft it didn't settle, or react to touch. The original slime was not made with pva or borate it was made with guar gum and didn't have an appealing texture. Slime is now sold across the world in shops online the main seller is Etsy but other slime sellers branch out and create their own websites. Like for example GlitterSlimes (Nicolette) started on Etsy and made her own…

Coronary artery disease continues to maintain its status as the leading cause of morbidity and mortality in the United States. It is a high priority of clinicians not only to manage the acute symptoms of coronary artery disease, but also to prevent future major adverse cardiac events, such as acute myocardial infarction and cardiac death. Percutaneous coronary intervention is a nonsurgical procedure to treat atherosclerosis within the heart’s vessels (cite). Percutaneous coronary intervention, a…

Poly-paraphenylene terephthalamide, or Kevlar, is a strong polymer that has been used in a wide range of applications from clothing to spacecraft. The material was chosen because of its relevance in my life as a musician due its application in marching snare drum heads. Kevlar's inception dates back to the late 1960s and early 70s in a DuPont facility, where a young woman named Stephanie Kwolek was researching high-performance fibers for use in reducing gasoline consumption in automobiles. Her…

relatively easy modification of the polymer, in either grafting or cross-linking reactions [1, 7]. Grafting reactions involve the addition of a functional group, usually resulting in the increased adsorption capacity due to increased absorption sites [7]. Cross-linking reactions bind neighbouring chains together, causing a decreased number of adsorption sites due to increased binding between chains [7]. Cross-linking provides greater stability for the polymer, and is often cross-linked using…

buggy was the catalyst for my interest in polymer science. Modern buggies have polyurethane wheels, which drastically reduce friction when heated, as well as polycarbonate windshields for precision molding. I began to notice how important polymers are in everyday life, and how much research went into developing these materials. I want my career to be in a field that impacts the lives of people around me, and I can make a difference through sustainable polymer research. I made the decision to…

the synthetic rubbers families that are derived from Styrene and Butadiene.[53] SBR is an aqueous dispersion of (25%) Styrene (CH2=CHC6H5) and (75%) Butadiene (CH2=CH-CH=CH2) copolymer as shown in Figure (2-1). The copolymerization of these two polymers may done by different ways. Mostly they copolymerized in an emulsion process, by dispersing a soap like surface acting agent where the materials are in water solution.[54] Figure (2-1) The chemical structure of SBR[55] 2.7.1 Properties of SBR…

mixed with other chemicals. The intended result of this experiment is a rubber like, spherical polymer ball which bounces upon impact. This was accomplished…

(Fig. 7.1) and arranged in homopolymeric blocks of each type and in heteropolymeric blocks [1]. It is a water soluble polysaccharide and has pKa values of 3.38 for the ‘M’ and 3.65 for ‘G’ units [2]. It can form complexes with positively charged polymers due to its anionic character. It is utilized as emulsifier, thickening agent, foaming agent, bulking agent and gelling agent in pharmaceutical, medical and food industries [3]. Alginate presents a number of interesting properties with regard to…

different type of CNT bucky paper reinforced laminar composites. It depicts that the peak values of the loss modulus was shifted towards the maximum temperature in both the cases i.e 16ply and 16ply fun after post curing , which indicate the reduction of polymer chain mobility and increase in the internal friction. This was further supported by its crosslink density. The increased internal friction due to cross linking between CNT and epoxy enhances the dissipative effect. Therefore the…

are changed with change the concentration of the filler and frequency of applied electrical field. Keywords: Composites, poly-methyl methacrylate, Electrical Properties. Introduction In order to fulfill the requirements of polymer industry many developers usually blend polymers together in order to reach an optimum balance of…