Maya Ellison
Acrylic is a synthetic polymer derived from methyl methacrylate. It is a transparent thermoplastic, commonly known as acrylic glass, with brand names such as Plexiglas, Perspex, and Lucite. Acrylic is widely used due to its lightweight and shatter-resistant properties compared to glass. It can be formed into various shapes and sizes through processes like thermoforming, which involves heating and manipulating the material. Acrylic has superior weathering properties and is UV-stable, making it suitable for both indoor and outdoor use. However, it exhibits brittle fracture behaviour under stress, and its deformation behaviour varies depending on the specific type of acrylic resin and the presence of modifiers. This raises the question: does acrylic undergo plastic deformation?
| Characteristics | Values |
|---|---|
| Plastic Deformation | Acrylic resins can exhibit plastic deformation during the fracture process |
| Resistance to Deformation | Acrylic has the ability to resist deformation |
| Brittleness | Acrylic resins can exhibit brittle failure behaviour |
| Ductility | Acrylic resins can exhibit ductile failure behaviour |
| Elasticity | Acrylic becomes elastic when heated |
| UV Stability | Acrylic has superior weathering properties and is UV stable |
| Chemical Resistance | Acrylic has poor chemical resistance but is resistant to common household chemicals and disinfectants |
| Thermoforming | Acrylic can be thermoformed using techniques such as drape forming, pressure forming, and vacuum forming |
| Colours | Acrylic is available in a variety of colours, including black, white, red, and green |
| Opacity | Acrylic comes in different opacities, including translucent, transparent, mirrored, and opaque |
| Thickness | Acrylic sheets can be produced in various thicknesses and dimensions |
| Grades | Acrylic comes in different grades, including extruded and cast |
| Applications | Acrylic is used in signage, windows, skylights, lighting, safety shields, and more |
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What You'll Learn
Acrylic resins and their deformation behaviour
Acrylic resins are widely used in a variety of applications, including in the construction, automobile, and furniture industries. They are also used in the dental industry, where denture fracture is a common problem. As a result, new and stronger acrylic resins with better deformation behaviour have been developed.
The deformation behaviour of acrylic resins can be evaluated through impact and flexural strength tests, as well as fracture morphology analysis. These tests can reveal the percentage of deformation, the type of fracture (brittle or ductile), and the presence of elastic and/or plastic deformations during the fracture process. For example, Lucitone 550 and Impact 2000 acrylic resins exhibited brittle failure behaviour with a low percentage of deformation (0.002% and 0.003%, respectively), while QC20 and Impact 1500 presented ductile failures with a higher percentage of deformation (0.032% and 0.0105%, respectively) and both elastic and plastic deformations.
The deformation behaviour of acrylic resins can be influenced by the addition of impact modifiers, such as cross-linking agents and rubber incorporation. However, there is limited information on the effects of these additives on the deformation behaviour of acrylic resins under impact and flexural tests.
Thermoforming is a common technique used to form acrylic sheets, where the acrylic sheet is heated and manipulated over a mold. The temperature and forming speed must be carefully controlled to achieve the desired shape and prevent deformation. Acrylic has the ability to resist deformation at room temperature, but when heated, it becomes pliable and can be formed into complex shapes.
Overall, the deformation behaviour of acrylic resins is an important consideration in their applications, especially in the dental industry where fractures are a common issue. By understanding the deformation behaviour and developing stronger resins, we can improve the quality and durability of products made with acrylic resins.
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Thermoforming acrylic
Acrylic is a plastic with the ability to resist deformation. However, when heated, it becomes pliable and can be manipulated to form three-dimensional shapes. This process is known as thermoforming.
Thermoforming is a plastic moulding technique that is mainly used for packaging consumer and large customised products. It can be divided into thin and thick gauge thermoforming. Thin-gauge thermoforming uses less than 0.060 inches of acrylic to manufacture food and medical packaging, such as disposable cups and trays. Thick-gauge thermoforming uses 0.120 inches or more to manufacture industrial products like refrigerator liners and plastic pallets.
The thermoforming process begins with a design, which is refined by engineers to ensure it is suitable for acrylic manufacturing processes. Once the design is ready, the acrylic sheet is heated to a pliable temperature. The sheet is then placed on the mould surface and manipulated to form the desired shape. Air or vacuum pressure may be applied to force the sheet against the mould. The formed sheet is then left to cool in the mould for a few seconds before being ejected.
Thermoforming offers several advantages, including fast tooling production, cost-effectiveness, and the ability to form complex shapes. However, it also has some disadvantages, such as the difficulty in producing parts with sharp bends and corners, and the fact that only one side of the product is defined by the mould.
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Acrylic's chemical resistance
Acrylic has the ability to resist plastic deformation, but when heated, it becomes elastic and can be formed over a mold. However, it is important to note that the pressure required to deform the sheet depends on the thickness of the sheet and the temperature it is subjected to.
Regarding chemical resistance, Plexiglass acrylic is known to have good resistance to a range of chemicals. For example, it can withstand 30 days of constant exposure to some chemicals without any damage, and may even tolerate certain chemicals for years. However, there are other chemicals that can cause softening, swelling, severe crazing, cracking, or permeation losses after just 7 days of constant exposure.
The chemical resistance of acrylic is typically rated using a letter system, with ratings of E, G, F, and N being common. An E rating indicates that the acrylic can withstand 30 days of constant exposure to a chemical without any damage and may even tolerate it for years. A G rating means there is little to no damage after 30 days of constant exposure, while an F rating denotes some effect after 7 days of constant exposure, including possible softening and swelling. Finally, an N rating means that the acrylic is not recommended for continuous use with the chemical, as it may cause immediate and severe damage.
It is important to note that the specific chemicals being used and the conditions of use can also affect the performance of the acrylic. For instance, ACRYLITE® acrylic sheets are considered "Not Resistant" if a chemical causes any objectionable alteration to the surface, such as discoloration, change in gloss, blistering, softening, swelling, loss of adhesion, or other special phenomena. On the other hand, they are rated as "Resistant" if no objectionable alteration occurs, and "Limited-Resistance" if there is a temporary effect that can be removed by cleaning.
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Acrylic's colour and opacity options
Acrylic is a plastic moulding technique that involves heating thin acrylic sheet material until it reaches a pliable temperature. The hot plastic sheet is then manipulated to form a three-dimensional shape. This process is used for packaging consumer and large custom products.
Acrylic sheets can be formed through various techniques, including drape forming, pressure forming, and vacuum forming. Pressure forming, for example, involves placing the heated plastic on a mould surface and applying air pressure to deform the sheet into the mould cavity.
The colour and opacity options for acrylics are quite versatile. Artists can choose from a wide range of colours, including transparent, translucent, and opaque shades. To increase the opacity of acrylic paint, one can add a small amount of Titanium White or Mixing White, which are opaque pigments that do not significantly lighten the colour. Schmincke has also created an Aero Opaque Medium designed specifically for their fluid acrylics (acrylic inks) to increase opacity without adding pigment.
Additionally, layering techniques can be employed to manage transparency and opacity in acrylic paintings. Artists can create less saturated layers with opacity and then glaze transparent colours on top to achieve the desired saturation. Alternating layers of opaque and transparent colours can also be used, especially when working with darker backgrounds.
Other methods to increase opacity include using heavy-body acrylics, such as Liquitex Heavy Body, which provides thicker coverage, or adding a small amount of water to create a wash effect, though this may increase transparency.
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Acrylic sheet sizes
Acrylic sheets, also known as plexiglass, are available in a variety of sizes and thicknesses. They are commonly used as a substitute for glass due to their superior impact resistance, clarity, and lightweight nature.
Plexiglass can be purchased in standard sizes or cut to size for specific projects. The standard sizes typically range from 2'x4' to 6'x10', with thicknesses varying from 1/16" to 4". The thickness of the sheet is often listed as thickness x width x length.
For projects that require custom dimensions, many suppliers offer cut-to-size services. Acme Plastics, for example, provides plexiglass sheets in various sizes such as 4x8, 4x10, 4x12, 5x7, 6x10, 8x10, 12x12, 12x36, 14x14, 18x24, 24x36, and 30x36. The tolerances for length and width in cut-to-size panels are typically +/-1/8", while thickness can vary by +/- 10%.
Acrylic sheets can also be manipulated and formed into three-dimensional shapes through a process called thermoforming. This involves heating the acrylic sheet until it becomes pliable, then applying pressure or vacuum forming to deform it into the desired shape. Thermoforming can create complex shapes and large parts at a lower cost compared to other methods.
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Frequently asked questions
Acrylic is a synthetic polymer derived from methyl methacrylate. It is a transparent thermoplastic, used as an engineering plastic. It is also known as acrylic glass.
Acrylic has the ability to resist deformation. However, when heated, it becomes elastic and can be manipulated to form a three-dimensional shape.
Acrylic is formed through a process called thermoforming. Thin acrylic sheet material is heated until it reaches a pliable temperature and then manipulated to form a three-dimensional shape.
Thermoforming is a plastic molding technique. It is a process mainly used for packaging consumer and large customized products.
Acrylic has superior weathering properties compared to many other transparent plastics. It is also UV-stable and has better chemical resistance than other plastics.
