It is widely employed in the foodservice industry as rigid trays and containers, disposable eating utensils, and foamed cups, plates, and bowls. If you continue browsing the site, you agree to the use of cookies on this website. Thermal properties of plastic materials material formula coefficient of thermal expansion x106 k1 heatdeflection temperature 0. Selected engineering properties and applications of eps. Uv radiation has a slight effect on molded polystyrene. Polystyrene lightweight concrete polyconcrete zaher kuhail.
Celfort 300, foamular 400, 600 and are type 4 closedcell thermal. Highimpact polystyrene displays a less steep initial rise in the curve and, after reaching the yield point, pronounced deformation until rupture. Styrene is employed in the manufacture of polystyrene, an important plastic, as well as a. Irinaldo lopes da costa quality control laboratory adriane ferreira da silva helton dos reis barbosa 11. Polystyrene is the fourth largest thermoplastic by production volume. They are engineered from the toughest polystyrene resins to add a superior balance of enhanced properties for color control. Polystyrene solid and foam is widely used to protect consumer products. Polystyrene adheres well to wood but not to plastics, except to itself.
Thermal insulation properties of expanded polystyrene as. Raw material expanded polystyrene is made from expandable polystyrene, which is a rigid cellular plastic containing an expansion agent. High impact polystyrene hips sheet is a versatile, cost effective material. Recycling of polystyrene can be done by mechanical, chemical, and thermal methods.
Three different thermal treatments were investigated. Now that we have seen the structure of polystyrene, let us delve a little deeper into its properties. Thermal properties thermal properties are the properties exhibited by the substance when it is subjected to heat. Expanded polystyrene eps geofoam is a lightweight material that has been used in engineering applications since at least the 1950s. Polystyrene carbon nanotube pscnt composites have attracted considerable attention in research and industry fields due to high strength and electrical conductivity of cnt. Pdf recycling of expanded polystyrene from packaging. Polystyrene literally translated is polymerised styrene. It is rigid, brittle, relatively hard and has excellent gamma radiation resistance, good electrical properties but has poor chemical and uv resistance.
A systematic investigation was performed based on a statistical. Manufacturer the dow chemical company dow building solutions 200 larkin center midland, mi 48674 1866583blue 2583 fax 19898321465 dow chemical. Now foamed by pentane or carbon dioxide gas, polystyrene is made into insulation and packaging materials as well as food containers such as beverage cups, egg cartons, and disposable plates and trays. The strength of eps foam along with its shock absorbing properties makes it effective for use in childrens seats and cycling helmets. Mar 25, 2020 single amorphous polymeric nanofibers exhibit tunable properties when their sizes drop down below a specific onset value, including increases in modulus and strength. The glass transition behaviour and thermodynamic properties of amorphous polystyrene. Depending on the application it is used for, polystyrene s properties will change. Datasheet for typical physical properties of expanded polystyrene eps or styrofoam from universal foam products.
Polystyrene is compound is nonbiodegradable with a couple of exceptions. Polystyrene c8h8n properties, structure, molecular. Styrene is a liquid that can be chemically linked to create polystyrene, a solid plastic that displays different properties. Polystyrene polymers get degraded on exposure to sunlight, due to photo oxidation. Expanded polystyrene eps is a commonly used polymer in the packaging industry. Shock cush ioning properties of eps are not signifi cantly affected by change in temperature. These include the heat distortion temperature, glass transition temperature, thermal conductivity, etc. Three new onium salts have been used to prepare the nanocomposites, two are functionalized ammonium salts while the third is a phosphonium salt. Sep 04, 2001 polystyrene homopolymer, known as crystal polystyrene in the trade, is an amorphous, colorless, and transparent commodity thermoplastic. The mechanical properties of a polymer include its strength, elongation, modulus, impact strength, and toughness. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. The density of polystyrene can vary from 10kgm 3 to 50kgm 3. This page shows summary ranges across both of them.
Chloromethylation of polystyrene 2 polystyrene average molecular weight 1. Polystyrene is a transparent, colorless thermoplastic resin available in solventsolution or aqueousemulsion form. Thermal and mechanical properties of polystyrene modified. Ultimate guide on foam insulation material for several years, expanded polystyrene eps has been utilized as a material of choice in several food packaging applications, costeffective and energyefficient insulation in construction applications as well as cushion transport packaging material for shock sensitive goods and many more. Hips provide single and multilayer sheet structures. Properties, performance and design fundamentals of. Eps is supplied to molders in the form of a polystyrene bead. For more specific values, follow the links immediately below. In solution or modified bulk polymerization, the reaction takes place as the monomer is dissolved in a small amount of solvent, such as ethylbenzene. Abs polymers can be given a range of properties, depending on the ratio of the monomeric constituents and the molecular. Due to its clarity and ease of sterilization, polystyrene is used for a wide range of medical applications, including tissue culture trays, test tubes, petri dishes, diagnostic components, housings for test kits and medical devices.
Styrene, liquid hydrocarbon that is important chiefly for its marked tendency to undergo polymerization a process in which individual molecules are linked to produce extremely large, multipleunit molecules. This behavior is characteristic of tough materials. Production of liquid products and gaseous products are highly dependent on the reaction condition. A versatile, cost effective extruded polystyrene that can be used in a variety of applications. Polystyrene foam eps can be used in manufacture of sliders, model planes and even surfboards because of its positive strength to weight ratio. It is easily dissolved by many aromatic hydrocarbon solvents and chlorinated solvents. The mechanical and chemical properties are discussed in order to study the behaviour of the polystyrene under different environments i. The effect of free quenching on the mechanical, thermal, and thermophysical properties of polystyrene has been investigated. It has good thermal insulation properties with stiffness and compression strength comparable to medium clay. The material has been modified by the addition of flame retardant additives. Polystyrene is used to make a variety of consumer products, such as foodservice containers, cushioning for. In this study, processingstructuremechanical properties relationships in expanded wood fiber polystyrene composites epsc made with a physical blowing agent were investigated. A high rvalue retained even after prolonged exposure in high moisture environments. Properties, performance and design fundamentals of expanded.
The different branching structures for ldpe, lldpe and hdpe are illustrated in figure 2. Physical properties of expanded polystyrene astm c578 property type xi type i type viii type ii type ix type xiv type xv nominal density lbft. Generalpurpose polystyrene is clear, hard, and rather brittle. Generalpurpose polystyrene gpps highimpact polystyrene. An example is sticking polystyrene tiles onto a plaster wall. Polystyrene is a rigid, transparent thermoplastic, which is present in solid or glassy state at normal temperature. Styrofoam highload 40, 60 and 100 extruded polystyrene. The toughness of highimpact polystyrene increases with increasing rubber content. Polystyrene also is made into a foam material, called expanded polystyrene eps or extruded polystyrene xps, which is valued for its insulating and cushioning properties. The viscosity method was employed by relating solvent. Technical data sheet polystyrene sheets high impact polystyrene from styrene butadiene with very good mechanical properties and highly resistant to cold. Thermal properties insulation eps has very low thermal conductivity due to its closed cell structure consisting of 98% air. It also occurs naturally strawberries, cinnamon, coffee and beer. Understanding the detailed mechanism and corresponding microstructure change at the molecular level is key for reaching the longterm goal of controlling their properties and targeting applicable designs.
Expanded polystyrene properties and key benefits eps is a lightweight material with good insulation characteristics offering benefits such as. High impact polystyrene is a promising material for mechanical recycling since its properties are not extremely affected even after multiple processing of upto nine cycles. The stressstrain behavior of polystyrene is dependent on the. Our hips can be used in point of purchase displays, instore signage, food and medical trays, horticultural signage and tags. A list of material properties for bulk general purpose polystyrene and pmma from the. Polystyrene c8h8n properties, structure, molecular weight. Recently, several investigations showed that the pscnt composites. A wellknown use of xps is the vacformed polystyrene trays used for small portions of food that we see in the supermarket. The properties of ps include two common variations. Interplay of chain orientation and bond length in size. High impact polystyrene is a promising material for mechanical recycling since its properties are not extremely. All you wanted to know about the amazing properties of. Our patented process technology helps to ensure that celfort and foamular extruded polystyrene thermal insulation boardwill not corrode or decay over time. Abstract the thermal and mechanical properties of polystyrene ps modi.
Solid polystyrene products include injectionmolded eating utensils, videocassettes and audiocassettes. The great importance of eps recovery is related to the materials short service life and the high volume of. The mechanical and chemical properties are discussed in order to study the behaviour of. It is a rather poor barrier to oxygen and water vapour and has a relatively low. Polystyrene, polyethenylbenzene, lustrex, styron, vestyron, styrofoam. Polystyrene ps is a clear, amorphous, nonpolar commodity thermoplastic that is easy to process and that can be easily converted into a large number of semifinished products like foams, films, and sheets. Product name styrofoam highload extruded load and flexural properties of blocktype polystyrene foam insulation 2. Thermal properties of atactic and isotactic polystyrene. Here we shall learn about the physical, mechanical, optical, thermal, electrical, and chemical properties of polystyrene. Ps is made by the polymerization of styrene which is a kind of building block material used to produce a variety of plastic products. Thermophysical and mechanical properties of polystyrene. The results have shown that a slight improvement of the impact strength.
The graph bars on the material properties cards further below compare ps to. A list of material properties for bulk general purpose polystyrene. Foam polystyrene can be more than 95 percent air and is widely used to make home and appliance insulation, lightweight protective packaging. Properties, performance and design fundamentals of expanded polystyrene packaging expanded polystyrene expanded polystyrene eps is a generic term for polystyrene and styrene copolymers that are expanded into a variety of useful products. It is rigid, but when heated to 100 celsius, it becomes a flowing liquid. The extruded polystyrene foam is a fine laminate that is only 23 mm thick.
Crystal forms of the polymer polystyrene have low impact strength. Request pdf thermal insulation properties of expanded polystyrene as construction and insulating materials laboratory thermal conductivity testing of insulating materials provides useful. Our quality polystyrene sheets are characterized by high heat resistance and good stress cracking resistance. It causes superficial yellowing and friability, but does not otherwise effect its physical properties. The properties of the polymer depend strongly on the size of the particles, the rubber efficiency, i. Polystyrene, a hard, stiff, brilliantly transparent synthetic resin produced by the polymerization of styrene. Styrofoam highload 40, 60 and 100 extruded polystyrene insulation 1. Electrical properties the volume resistively of molded polystyrene within the 1. Foam polystyrene can be more than 95 percent air and is widely used to make home and appliance insulation, lightweight protective packaging, surfboards, foodservice and. In both forms, applications are limited to conditions where at least one of the adherends is porous. Can be printed offset lithography, screen, uv digital and flexography. Oct 01, 2015 thermal properties thermal properties are the properties exhibited by the substance when it is subjected to heat. Foamcontrol eps properties property astm c578 type xi type i type viii type ii type ix type xiv type xv nominal density lbft3 kgm3 0.
The blowing agent may be added during the polymerization process as in the production of expandable beads, or afterwards as part of the fabrication process as in foamed polystyrene applications. Selected engineering properties and applications of eps geofoam. It is widely used in the foodservice industry as rigid trays, containers, disposable eating plates, bowls, etc. By tgaftir, both ammonium and phosphonium treatments have been shown to degrade by a hofmann elimination mechanism at elevated temperatures. June, 1968 1 8 8 a private report by the process economics program stanford research institute. Dec 12, 2015 polystyrene preparation, properties, applications slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Expanded polystyrene physical properties expanded polystyrene has a flame spread index of 20 and a smoke developed index of 150300 when tested in accordance with astm e84ul 723 for densities from 0. It has good thermal insulation properties with stiffness and compression strength comparable to. By tgaftir, both ammonium and phosphonium treatments have been shown to degrade by a hofmann. General properties 1 qenos technical guides 7 structural differences between the polyethylenes the variations in chemistry between the processes produce important differences in the structure, and consequently the final properties, of the various polyethylenes. In chemical terms, polystyrene is a long chain hydrocarbon wherein alternating carbon centers are attached to phenyl groups a derivative of benzene.