evidently proves the addition of polybutadiene increases the impact strength of HIPS. During polymerisation‚ the addition of polybutadiene prevents the polymer chains from aligning. This means that there will a reduction of crystalline structures that can be formed. This results in a larger amorphous area‚ giving it the properties of an amorphous polymer. Since it
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loading and the extent of clay dispersion in the polymer matrix. Transition from liquid-like behavior to solid-like behavior shifts to significantly higher solids loading at higher shear rates which may be due to the alignment of the particles in the direction of flow at high shear rates. SEM micrographs are used to display the extent of intercalation and dispersion of the clay within the polymer matrix. INTRODUCTION AND BACKGROUND 1.1 Definition Polymer/clay nanocomposites display a change in composition
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Introduction A polymer is a large molecule comprised of numerous smaller molecules. It is possible for these large molecules to be linear‚ moderately branched‚ or highly interconnected. In the latter case the structure progresses into a large three-dimensional complex. The small molecules that serve as the basic building blocks for these large molecules are known as monomers (See Figure 1.1). An example of the relationship between a monomer and polymer is the commercially important material polyvinylchloride
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ABSTRACT For many years‚ the use of natural polymers for the fabrication of packaging materials has been an interesting alternative to replace non-biodegradable polymers which are normal components of these materials. The core problem of these starch based plastics is their hydrophilic character and the fact that they tend to become brittle with ageing. Unmodified starch is too much hydrophilic to be used as food packaging material. Chemical modification must be carried out in order to make them
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000 to 500‚000 amu‚ while thermosets are assumed to have infinite molecular weight. These chains are made up of many repeating molecular units‚ known as repeat units‚ derived from monomers; each polymer chain will have several thousand repeating units. The vast majority of plastics are composed of polymers of
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INTRODUCTION In this lab‚ we will be measuring the viscosity of samples of polyvinyl alcohols in order to determine the molecular mass of their components. Polyvinyl alcohol is an example of a synthetic polymer‚ which is a macromolecule. The general chemical structure of such compounds are well-characterized‚ although variation in characteristics such as molar mass‚ chain length‚ and extent of branching are not obvious from merely looking at their molecular formula. There is also the complication
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MICROENCAPSULATION Microencapsulation: Definition: It is the process by which individual particles or droplets of solid or liquid material (the core) are surrounded or coated with a continuous film of polymeric material (the shell) to produce capsules in the micrometer to millimetre range‚ known as microcapsules. Microencapsulation (Cont.): Morphology of Microcapsules: The morphology of microcapsules depends mainly on the core material and the deposition process of the shell. 1- Mononuclear
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Engineers‚ Brookfield‚ CT. (1996). 7. J. L. Throne‚ Thermoforming‚ Carl Hanser Verlag‚ Munich (1987). 8. J. D. Ferry‚ Viscoelastic Properties of Polymers‚ John Wiley & Sons Inc.‚ New York‚ NY (1980). 9. V. Shah‚ Handbook of Plastics Testing and Technology‚ John Wiley & Sons Inc.‚ New York‚ NY (1984). 10. H. S. Kaufman J. J. Falcetta ed. Introduction to Polymer Science and Technology: An SPE Textbook‚ John Wiley & Sons Inc.‚ New York‚ NY (1977). Because DuPont cannot anticipate or control the many different
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Polymeric Biomaterials (Mingyu Li z3369978) The use of polymers in biomedical applications is now widely accepted and they are termed with the generic name of polymeric biomaterials. A biomaterial can be defined by their function as a material in contact with living tissue that used to the treatment of disease or injury‚ and to improve human health by restoring the function of tissue and organs in the body.x Polymeric biomaterials in medicine include surgical sutures‚ drug delivery vectors‚ orthopedic
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their formation and function. Polymers are chains of monomers (atom or a small molecule that has the potential of chemically binding to other monomers of the same species) which link in various fashions (e.g. cross-link‚ linear linking) to form materials that are used constantly to help humanity’s comfort and existence thrive. An important innovation of chemical advances is a material known as Hydrogels. What are Polymers and Why Use Carbon and Silicon Atoms? Polymers are repeating chains of monomers
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