Before starting the experiments‚ it is essential to gain a basic concept and knowledge of shape memory polymer and scaffold first‚ and it covers a wide range of textile‚ chemistry and biology technology. After studying these reviews‚ some critical points of shape memory polyurethanes and scaffold would be found out. 2.2 Introduction of Shape memory polyurethanes (SMPUs) Shape memory polymers (SMPs) are stimuli-responsive smart materials which having the ability to change their shape upon by external
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This Industry Risk Ratings report from IBISWorld evaluates the inherent risks associated with the Petrochemical Manufacturing in the US industry. Industry Risk is assumed to be ’the difficulty‚ or otherwise‚ of the business operating environment’. The report looks at the operational risk associated with this industry. Three types of risk are recognized in our analysis. These are: risk arising from within the industry itself (structural risk)‚ risks arising from the expected future performance
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vulcanized rubber and return it to a workable state able to be reused as an alternative to virgin or synthetic rubber. Branded as Green Rubber‚ GRG’s product has wider applications than other rubber recycling products. Rising prices and shortages of natural rubber‚ global environmental movements‚ an abundance of waste rubber to be recycled and various government policies (European College Polymer College‚ 2003) (Eurpoean Union‚ 2005) aimed at ‘green’ recycling of rubber products‚ highlight some
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JOSEPHINE F. KHONGHUN SPECIAL EDUCATION CENTER WAWANDUE‚ SUBIC‚ ZAMBALES 4TH Prelim Test in ADVANCED CHEMISTRY NAME: SCORE: YEAR AND SECTION: DATE: I. MATCHING TYPE. Match column A with column B. Write the letter in Column B that matches the item in Column A on the space provided. ( 1 pt each) A. B. ______1. Deposits of organic materials A. petroleum ______2. Complex mixture of hydrocarbons principally alkanes
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for materials with a potential to be applied in the near future on automotive body panels. Hereupon‚ materials deriving from renewable resources will be preferred as opposed to the exhaustible fossil products. With the technical information of bio-polymers and natural reinforcements a database was created with the mechanical performance of several possible components for the prospect green composite. Following the review‚ an assessment is performed where aspects of suitability for the candidate elements
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chewing gum was made from tree sap but today’s commercial brands are loaded with harmful ingredients and chemicals. The modern day chewing gums are made of four major ingredients including synthetic rubber‚ plastic‚ sugar‚ and coloring (dye). Modern day gums are produced from synthetic polymers such as styrene- butadiene rubbers and polyvinyl acetate. The final product is composed of 60% sugar‚ 20% corn syrup‚ and only 20% actual gum material. People do not typically swallow gum
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Polyvinylpyrrolidone (PVP) is a synthetic polymer made from a monomer N_ vinylpyrrolidone. Its known as Povidone in the USP. PVP has many applications in pharmacy‚ medicine‚ industrial production and cosmetics (79). PVP appear as a free flowing white powder with a characteristic odor. It is available commercially with different K values. The K-value is an indication of the mean molecular weight which ranges from 2 to 3KDa for PVP-K12 and from 1000 to 1500KDa for PVP-K90 .It is Soluble in water and
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Science High School Department De La Salle Supervised Sta. Filomena‚ Dipolog City 1 Introduction Plastic bottles‚ plastic spoons‚ plastic packaging‚ plastic bags… we use a lot of plastic. Plastics are made from polymers‚ which are super long chains of atoms. We love them because they’re cheap and super sturdy for how light they are. The problem is that they’re so sturdy that‚ after we throw them away‚ they can sit around in a landfill for a million years. Almost
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concept of chemistry. Slime was every child’s favorite toy‚ but also the enemy of every mother of a clean carpet. During the 1920s‚ Nobel laureate Hermann Staudinger laid the groundwork for our modern understanding of polymer science. He suggested a new molecular model for polymers; one of long‚ chain-like molecules and not aggregates or
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are either animal or plant-based. Silk‚ wool and hair are all animal fibres Plant fibres include cotton and linen. Synthetic fibres and regenerated fibres are manufactured. Regenerated fibres are made from natural materials‚ such as cellulose from wood‚ that are chemically processed. Viscose and rayon are regenerated fibres. Synthetic fibres are all man-made from organic polymers Modern fibers: microfibers and smart fibres Turning fibres into yearn: carding Turning fibres into yarns: spinning
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