Mechanical properties of plastics 5. Plastic’s flexural properties are determined by monitoring the force required to bend and break the material beyond repair. , fillers and plasticizers), extend their lifetime (e. - Concordia UniversityMECH 221 lecture 20/3 Mechanical Properties of Polymers Schematic stress–strain curve for a plastic polymer showing how yield and tensile strengths are determined. 2). 9. 6. doc Stress, strain and modulus are related to each other by the following equation. 10. Sort plastic materials: Click the down or up arrows or column headings to sort plastic materials or material properties. Typical small molecules like water or ammonia can be set free during the reaction. Dielectric strength. Mar 5, 2025 · In summary, plastics exhibit various mechanical properties, making them versatile materials for multiple applications. 2. It is dominantly an "engineering" subject, but with an atomistic flavor. Mechanical Properties of Plastics Mechanical Properties: tensile properties,* compressive properties, bending, flexural, and shear properties; impact resistance, crack resistance, tear and tear-propagation resistance; fracture toughness. , stabilizers), overcome safety concerns (e. Give some known properties of plastics? Plastics are lightweight materials with a high strength-to-weight ratio, they can be manufactured inexpensively and hugely produced, they are shock and water resistant, they are both thermally and electrically insulating materials. , stabilizers and flame retardants), or simply modify their Handy list of plastic material properties and their descriptions. , hydrophilicity, roughness, and reactive functionalities). It lists over 30 different plastic materials and provides data on their abrasion resistance, coefficient of friction, compressive strength, elongation, hardness, impact strength, modulus, Poisson's ratio, tear strength, and tensile strength. Jan 1, 2022 · In most cases, plastics are not pure polymers but contain a variety of additives designed to facilitate the molding processes (e. Consequently, any reporting of mechanical properties must specify these conditions for them to have any worth in comparing with other starch-based products. Rigidity. The group also provided a method to estimate the mechanical properties of the polymer/fiber composite using an Average Stiffness Method [152]. Flexural properties. It has high resistance to fatigue, impact, heat, and freezing. 2 Molecular Weight Many physical and mechanical properties of amorphous polymers im­ prove rapidly as the molecular weight increases up to the threshold molecular weight (Sec. e. professionalplastics. The reaction can occur as a step reaction. It is important to note that the equation for the plastic region curve, σ = H ε p n, is dependent on plastic strain, and so we will need to determine the values of plastic strain for the two points of interest. Polycondensation: Generation of plastics by build up of polyfunctional com-pounds. 1 PHYSICAL PROPERTIES /plastic/high temperature thermoplastic) Brittle polymer (Glassy polymer/low temperature thermoset) This course is aimed at presenting the concepts underlying the response of polymeric materials to applied loads. Plastics Mechanical Properties. In current scenario, plastics are used in different fields of application like food packaging, toys, furniture, container, pipes, in automobile and bottles for soft drinks and water, etc. com Order Online at www. Feb 26, 2008 · Plastics Mechanical Properties - Download as a PDF or view online for free. These will include both the molecular mechanisms involved and the mathematical description of the relevant continuum mechanics. Submit Search. Dec 31, 2024 · Polypropylene is the second most used plastic after polyethylene. The monomer units are organic carbon-based molecules. *This introduction to polymers and plastics focuses on tensile properties of plastic film. This chapter describes various structural-related factors which affect polymeric mechanical properties. Compare plastic materials: Select two or more materials and then click “Compare Materials”. High impact and tensile strength and good stability for a long period under high temperatures are important properties of these plastic parts. 8. Degradation from heat, mechanical stress, and oxidation during repro-cessing are among the leading causes of mechanical properties differences between Mechanical Properties of Polymers Dr. A glassy polymer such as polystyrene is quite stiff, showing a high ratio of initial stress to of the recycled plastic. Call Professional Plastics at (888) 995-7767 or E-Mail sales@proplas. Dec 1, 2022 · All these properties were derived from mechanical testing in tensile mode. A simple measure of the differences produced in mechanical behaviour is the elongation that occurs when a plastic is loaded (stressed) in tension. Chemical stability. Heat resistance. ultimate tensile strength, ultimate tensile strain, and Young’s modulus, also increased as the volume of fiber reinforcement increased. Fire resistance. Properties are Following are the properties of plastics- 1. Their tensile strength, modulus of elasticity, and impact resistance can be tailored through molecular engineering and processing techniques. Feb 26, 2008 Download as PPT, PDF 22 likes Mar 26, 2019 · Plastic materials (and their additives) are selected for a particular application on the basis of quality, cost, and performance, established by standardized test procedures. It covers the influence of processing and structure on mechanical properties of Feb 25, 2025 · The physical state and morphology of a polymer have a strong influence on its mechanical properties. 7. PP has excellent mechanical properties. Oct 2, 2021 · This contributes to the improvement of some of the mechanical properties of recycled plastic. The possible results and typical values observed during such tests, depending on material behaviour, are summarised in the graph. Eng. Medraj Mech. Examples include valve covers and seats, fuel rails, water pump housings, etc. Nearly all the mechanical properties of plastics are determined Chapter 3 describes basic mechanical testing procedures. Dec 15, 2016 · The successful implementation of PLA in consumer and biomedical applications relies not only on mechanical properties being better than or comparable to conventional plastics, but also on controlled surface properties (e. PP is harder and can be used for mechanical and structural applications. For example, tensile properties of plastics such as plastic tensile strength and rigidity can be determined according to DIN EN ISO 527 by briefly applying load in one direction with a tensile test. Abrasion resistance. Dec 9, 2019 · To make material properties transparent and accessible to their end users, plastics manufacturers generally provide data sheets describing the mechanical properties of the plastic being purchased. Flow property at elevated tempt. The plastic reprocessing process using the injection molding method produces plastics with lower mechanical properties than the extrusion process. The document provides information on the mechanical properties of various plastic materials. 3. Mechanical strength. The mechanical properties of recycled plastic will mainly be affected because the mechanical recycling process involves heat and some physical processes. g. The results show that a wide range of mechanical properties is covered by the biobased and/or biodegradable plastic portfolio. Examples include Cams, couplings, and gears. M. Mar 1, 2018 · The mechanical properties, i. Includes Izod Impact (toughness), Thermal Properties, Tensile Strength, Light Transmittance, Coefficient of Friction, etc. Mechanical Plastic Units. Different mechanical properties can be determined depending on the need and the field of application of each product, such as the packaging, construction or automotive industries. 4. Elastic modulus is very much lower than for metals or ceramics Beyond the yield point sample Jan 1, 2020 · The outburst in population worldwide has led to the utilization of polymers which are mostly plastics that are cheap and easily available [3]. Find more information about a specific plastic material: Click on a specific plastic material for more information. For example TPU, PBAT, PBS, and PBSA show elastic properties whereas PGA, PHB, PHBV and PLA are more stiff and brittle materials. Nov 11, 2022 · Plastic films can be tested according to the ISO 527-3 standard, whereas injection and extrusion molded plastics are usually tested as per ISO 527-2. Luckily all of these properties are commonly known for a material. This article centers on the physical and mechanical properties of plastics and their evaluation. Mechanical properties describe the material’s reaction to an applied force, such as tension, compression, impact, etc. Thermoset plastic cannot be recycled whereas thermoplastics are To better understand the properties of plastics it is important to know about the tran­ sitions that occur, such as those that have a glass transition temperature of T11' a term explained in this chapter. Questions? Ask a Plastics Expert or Get a Quote. Find below what advantages does it offers over PE: PP has crystal-clear transparency than PE. The modulus or stiffness of a material can be determined when the material is loaded in different ways, such as tension, compression, shear, flexural (bending) or torsion (twisting). Jan 1, 2014 · Thus, the mechanical properties of starch-based plastics are highly depended on the source of the starch, the processing and aging conditions, and the test conditions. Such properties can be investigated and compared between different products using standardized test methods. Additionally, the mechanical properties of recycled plastic depend on the processing method used. Impact strength. Plastic strain can be calculated from total strain using: Testing of mechanical properties. com Title Microsoft Word - Mechanical Properties of Plastics. Dept. AND MECHANICAL PROPERTIES OF POLYMERS A1. Sep 9, 2022 · 1. . Chemical and Heat Resistant Plastic Components. AIMPLAS offers you different solutions to determine the mechanical properties of a plastic material. , plasticizers), enhance mechanical properties (e. hbshe nyrwkg owyomwrz yodqp rxaiheg ncwpz cfbcl cmgau xmycm iibbl ajeig jbb fwrou uxbcg mvrxe