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Frequency Scans
Published in Kevin P. Menard, Noah R. Menard, Dynamic Mechanical Analysis, 2020
Kevin P. Menard, Noah R. Menard
The DMA users from a rheological or polymer engineering background depend on the DMA to answer all sorts of questions about polymer melts. Similarly, food and cosmetics depend heavily on these studies as well as continuous shear to study emulsions and suspensions. For many chemists and thermal analysts using DMA, the frequency scan is an ill-defined technique associated with a magical predictive method called time–temperature superposition (TTS). In this chapter, we will attempt to clear away some of the confusion and explain why the frequency dependence of a material is important and how we can use it to expand our understanding of those materials. We’ll also look at the biggest area of use for frequency scans, polymer melts, solutions, and suspensions.
Pharmaceutical Application of Chitosan Derivatives
Published in Amit Kumar Nayak, Md Saquib Hasnain, Dilipkumar Pal, Natural Polymers for Pharmaceutical Applications, 2019
Fiona Concy Rodrigues, Krizma Singh, Goutam Thakur
With the advancement in polymer engineering, a number of biopolymers are being discovered. Chitin and CS have established their significance by displaying their ability to be used in a wide array of applications. Due to its biocompatibility and biodegradability, CS has been an ideal candidate in the pharmaceutical domain. The further development in synthesizing the derivatives of CS has led to broadening the array of its pharmaceutical applications. This chapter gives a comprehensive overview of the general properties of CS, such as its structure and methods of extraction. It also discusses the broad classification of the derivatives synthesized from CS and finally elaborates on the recent applications of CS in wound healing, tissue engineering, and pharmaceutical domain.
Textile Fibres and Recent Developments
Published in Asis Patnaik, Sweta Patnaik, Fibres to Smart Textiles, 2019
Bemberg microporous membrane is an innovative product in polymer engineering that is made from cellulose. The polymer is used in the medical field as filters that isolate pathogens that cause Acquired Immune Deficiency Syndrome (AIDS) and hepatitis B in the blood. The filtration membrane is homogeneous and multi-layered with pores smaller than viruses (Ito et al. 1989).
Mechanical and drilling characterization of biodegradable PLA particulate green composites
Published in Journal of the Chinese Institute of Engineers, 2022
The matrix of PLA pellets with an average size of 3 mm and three different fillers in the form of powders with a mean size of 50 µm were used as raw materials to fabricate biodegradable PLA PMCs. Sawdust, Rice husk, and Bagasse powders of 5 volume % with respect to matrix quantity were used as filler materials. The 5 volume % of reinforcement on the PLA matrix was chosen based on the literature and feasibility on both mechanical and machining aspects. The PLA pellets (95 volume %) were laid in the steel mold with an aluminum foil sheet of 150 × 150 mm in size and thickness of 5 mm and hot-pressed using a compression molding machine. The compression molding was carried out at B.S. Abdur Rahman Crescent Institute of Science and Technology, Chennai, at the Department of Polymer Engineering.
Features of Casson liquid in non-linear radiative magnetized cylindrical media: a numerical solution
Published in Waves in Random and Complex Media, 2022
Khalil Ur Rehman, Maryum Khalil, Nabeela Kousar, Wasfi Shatanawi
Referring to the literature reported above, it is noticed that the blood with changing anticoagulants, hematocrits, temperature, and other factors can be studied by using the constitutive relation of the Casson fluid model. Due to a wide range of shear rates, the Casson fluid represents an extensive range of polymer properties. Owning to such importance we offer the investigation of the Casson fluid flow field subject to the stretched cylindrical surface along with the combined special effects of varying thermal conductivity, thermal radiation, viscous dissipation, externally applied magnetic field, and heat generation or absorption. The flow equations are constructed mathematically. The corresponding numerical solution is obtained by utilizing a shooting method with RK-technique. The Nusselt number and skin friction are calculated carefully. The impacts of physical parameters such as Prandtl number, variable thermal conductivity parameter, thermal radiation parameter, heat generation parameter, magnetic field parameter, Casson fluid parameter and curvature parameter are examined and offered by the use of line graphs. The outcomes of the present analysis will help researchers to explore the flow field properties subject to blood flow, silicon suspensions, the printing industry, and polymer engineering.
Statistical engineering: Synergies with established engineering disciplines
Published in Quality Engineering, 2022
Because there are many types of problems there are many types of engineering. The types may be loosely categorized into seven major groups:Biological - solve problems at interfaces of plant, animal, and microbial systems. Examples include biological, agricultural, and biomedical engineering.Chemical - use chemistry to create and improve materials. Examples include chemical, material, and polymer engineering.Civil - design and build structures. Examples include civil, construction and structural engineering.Electrical - design electrical equipment, devices, and electronic systems. Examples include electrical, electronic, computer and software engineering.Geotechnical - solve problems involving earth materials. Examples include petroleum, geological and environmental engineering.Management - improve operation of integrated systems of people, materials, equipment, and energy. Examples include industrial and systems engineering.Mechanical - design and build things mechanical. Examples include aerospace, mechanical, naval and automotive engineering.