The structure and properties of polymers the structure and properties of polymers by. Ga sources and processing acacia senegal and acacia seyal trees are the main sources of ga. Every polymer has its own characteristics, but most polymers have the following general properties polymers can be very resistant to chemicals polymers can be both thermal and electrical insulators generally, polymers are light in weight with varying degrees of strength polymers can be processed in various ways to produce thin fibers or. Dotfaaar0411 office of aviation research washington, d. Biodegradable polymers are defined as polymers comprised of monomers linked to one another through functional groups and have unstable links in the backbone. Failure of polymers in certain applications to carry design loads or occasional accidental overloads may be due to excessive plastic deformation resulting from the inadequate strength properties of the polymer. Mechanical behavior of polymers iowa state university.
Polymers mechanical properties all polymer mechanical properties are time and temperature dependent deformation evolves through chain unfolding and sliding. Polymer structures and properties is the property of its rightful owner. Laurencin1,2,3 1department of orthopaedic surgery, new england musculoskeletal institute, university of connecticut health center, farmington, connecticut 06030 2institute of regenerative engineering, university of connecticut health center, farmington, connecticut 06030. Technical whitepaper dielectric properties of polymers. The chemical structure determines the polar or nonpolar nature of the final polymer and this then largely determines the behavior of the polymer under a variety of electrical situations. This handbook focuses on applications of thermal analysis techniques in the field of polymers. Another approach to thermodynamics of polymer solutions 165 2. Polyester coathere is an example of a polymer you may have. The dielectric properties of polymers are largely predictable from the chemical structure of the polymer. A primary reason that polymer properties are different is because the chemical compositions of metals, polymers and ceramics are totally different. Viscoelastic behavior reflects the combined viscous and elastic responses, under mechanical stress of.
Physical structure of polymers, small vs large molecules, molecular features, some physical technique for studying polymers, molecular sizes and shapes and ordered structures, polymer blends and copolymers, polymer blends and copolymers, regular chains and crystallinity, morphology and motion, morphology morphology and motion. All these techniques affect the optical properties of polymers. The ductility of thermoplastic polymers is reduced upon cooling 5. Polymer properties and characterization authorstream. Find materials for this course in the pages linked along the left. The structure and properties of polymers slideshare. Qatar was recorded as the fastest growing consumer of polymers in the region which is growing at a rate of 14% annually. Properties of polymers the glass transition temperature tacticity molecular weight 32 v.
Mechanicalpropertiesof polymers harvard university. Find powerpoint presentations and slides using the power of, find free presentations research about properties of polymers ppt. If youre after basic information on plastic materials, this is the place to find it. Physical properties of polymers authorstream presentation. Mechanical properties of polymers concordia university. Polymers are composed of nonmetallic elements, found at the upper right corner of the periodic table. The properties of polymers depend on their size, shape and three dimensional structure process by which the monomer molecules are linked to form a polymer molecule is called.
Thermal analysis is the ideal technique for determining material properties and transitions and for characterizing polymeric materials. Crystallinity increases the barrier properties of a polymer packaging. Introduction to materials science chapter 19, thermal properties 3. These species grow naturally in the semiarid subsaharan regions of africa. Prabhu contents heat capacity thermal conductivity thermal expansion glass transition temperature factors affecting tg heat capacity a solid materials potential energy is stored as its heat energy. Examples are proteins, cellulose, starch, resins and rubber. Heat capacity is a measure of the ability of the material to absorb thermal energy. Basim abujdayil 1 polymer glass transition have you ever left a. The adobe flash plugin is needed to view this content. Correlation function of a gaussian chain 166 3 dynamics of dilute polymer solutions 167 3. One of the great design strengths of composites is the multiple. With increase in crystallinity, the optical properties of a polymer are changed. Crystalline and amorphous polymers polymer strength and stiffness increases with crystallinity. Material progressively releasing dissolved or dispersed drug, with.
Optical characterization and properties of polymeric. The structure and properties of polymers slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Medraj mech 221 lecture 2114 viscoelasticity if you make a ball of a silly putty, and set it on plate, it flattens out by. Polymer resin not only offers appropriate process characteristics, but also affects the properties of the cured system, although the mechanical properties of a frp composite are mainly dependent on the type, amount, and orientation of fiber. Thermosetting polymers become permanently hard at elevated temperatures and pressures.
Colligative properties in nonideal solutions 164 2. From the solubility point of view, pharmaceutical polymers can be classi. Topic 7 optical properties of polymers part 1 youtube. Thermal properties of polymers polymer engineering dr.
They slowly disappear from the site of administration in response to a chemical reaction such as hydrolysis. If you continue browsing the site, you agree to the use of cookies on this website. View and download powerpoint presentations on properties of polymers ppt. Polymers and their properties introduction basic topics. Introduction to materials science, chapter 15, polymers. Their versatility makes them suitable for a whole range of applications, and comes from the capability of manufacturers to tailor microstructures and therefore properties through control of the processing conditions. Dna carbohydrates 4 4 4 6 6 7 9 10 10 10 10 10 19 synthetic and biological polymers polymers. Biomedical applications of biodegradable polymers bret d. Secondly, it is the rheological properties that govern the flow behaviour of polymers when they are processed in the mol. Scribd is the worlds largest social reading and publishing site. Ppt polymers powerpoint presentation free to download. The glass transition temperature 33 the glass transition temperature is the temperature at which an amorphous solid becomes soft upon heating or brittle upon cooling. Dotfaaar0411 firesafe polymers and polymer composites. Polymer waste is a serious burden for the environment because common organisms.
Types of polymers classification of polymers characteristics of polymers properties of polymers streng slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Ppt polymers powerpoint presentation free to download id. Lecture notes polymer physics materials science and. Here youll learn the definition and properties of polymers, another name for plastics. Microsoft powerpoint lecture 21 polymers 3students 2017. Polymers that exhibit extreme elastic extensibility when subjected to relatively low mechanical stress also known as rubber some elastomers can be stretched by a factor of 10 and yet completely recover to their original shape although their properties are quite different from thermosets, they share a similar molecular structure. Introduction to materials science, chapter 15, polymer structures university tennessee, dept. The simplest definition of a polymer is a useful chemical made of many repeating units. An understanding of polymer crystallinity is important because the. A polymer can be a three dimensional network think of the repeating units. If so, share your ppt presentation slides online with. Macromolecules formed by the covalent attachment of a set of small molecules termed monomers. Polymers are made of chains of repeating compounds. Mechanical properties of polymers are much dependent on time dr.
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