Polypropylene

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    Plastic Prefilled Syringes

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    applications for which glass is an unsuitable delivery system. Plastic has been an alternative to glass in prefilled syringes since the early 1990’s. Earliest plastics were, however, made of polypropylene which did not offer the clarity of glass, many of its barrier properties or ease of sterilization. Polypropylene plastics also presented more challenges regards to extractables and leachables than glass due to the lack of historic data.…

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    Creep Experiment Essay

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    1. OBJECTIVES The objectives of the experiment are: • Measurement of creep deformation in 2 materials; lead and polypropylene at room temperature. • Determine how creep deformation of chosen materials can be affected by stress. • Recognise that the two classes of materials show differences in creep behaviour. • Awareness of creep as a design consideration. 2. THEORY 2.1 Introduction Structural materials are often placed in service under a certain applied load at elevated temperatures (eg. wind…

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    Veejay Plastic Case Study

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    high chemical resistance, electrical insulation properties, and toughness. • Polypropylene: This is a semi-crystalline polymer, which can be structurally altered to meet process requirements across a wide range of temperatures. Polypropylene has high chemical resistance and low-temperature characteristics. It shows good dimensional stability under humid conditions. We can injection mold the following types of polypropylene…

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    Defining the Problem/Question Task 3 was to design and test a series of superabsorbent pillows to identify a quantitative trend that can efficiently clean-up spills of heavy metal ion solutions. This investigation has value to companies or people they want to find a way to efficiently clean-up spills of toxic metals in bodies of waters that could damage species in and around these waters. Experimental Design and Procedure In order to efficiently clean-up spills of heavy metal ion solutions…

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    type of bag used does affect how many times a tote bag has to be used in order to be sustainable. Noah Dillon, a writer for The Atlantic cites an earlier study from the United Kingdom Environmental Agency stating: “Tote bags made from recycled polypropylene plastic require 26, and cotton tote bags require 327 uses”. This is why the bag material is so important when choosing one, because it can either be very good for the environment and sustainable or it can take many uses and have to replaced…

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    Polyethylene Case Study

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    P&G brought in Polypropylene to replace Polyethylene for the back sheet from the chemical industry. Two American chemists working for Phillips Petroleum of the Netherlands, Paul Hogan and Robert Banks, invented the material in 1950’s. Polypropylene is similar to its ancestor, polyethylene, and shares polyethylene's low cost, but it is much more robust and can be blow moulded. More importantly, it provides a cloth like look and a softer and natural feel that mothers demanded. It provided the…

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    Thread lifting is the latest innovative and exciting new method to reduce the signs of aging by elevating sagging tissue in the brows, cheeks and midface. The threads can also reposition the brow and soften the appearance of jowling. In some cases threads may be used to tighten loose neck skin, saving the requirement of a formal anterior neck lift. In this article we will look at three of the most popular thread lifting techniques that are presently performed under local anesthesia. The three…

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    Biopol Properties

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    Describe the Properties of Biopol Biopol is a copolymer made of the monomers PHV and PHB. PHB alone, with its short methyl side chain, is brittle and has very high crystallinity, meaning it cracks easily. Due to its high crystallinity and overall unsuitable properties for industrial use, PHV has been added to created PHBV, or Biopol. Biopol is semicrystalline, meaning it can still crystallize as well as melting at a lower temperature than PHB, making it industrially suitable. Due to its long…

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    dissected with scissors and pushed away from the vaginal mucosa (figure 3). The trocar passes through the skin incisions to reach the pubovesical space, a finger is placed in the vagina for the incoming instrument. Hence, a precut mesh monofilament polypropylene (Avaulta Solo, Bard Covington USA) is used, the arms of the mesh pass into the paravesical area, and then through the obturator internus muscle, the obturator membrane, the adductor muscles, subcutaneous, fascia lata, skin.…

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    Polyethylene Essay

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    QUESTION: Give the Preparation, Properties and Applications of any four POLYMERS 1. Polyethenics ( Vinyl Resins) They are obtained by the polymerization of monomers containing the ethylenic bond (-C=C-) I. Polyethylene ( PE ) Polyethylene is one of the simplest and most inexpensive polymers. It is a waxy, chemical inert plastic. It a thermoplastic formed by the addition polymerization of ethylene. There are two types of polyethylene  Low Density polyethylene (LDPE) By using free radical…

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