The world of polymer resins is vast and sometimes confusing. But it’s our world, and today we’ll explain the basics: what polymer resins are and how we use them.
What Are Polymers?
Did you know polymers surround you every day? Before we get to polymer resins, let’s start with polymers themselves. Polymers are large molecules made of smaller, repeating units called monomers. These monomers link together in chain-like structures, often forming complex three-dimensional networks.
The interesting part: polymers are a critical component of many everyday materials. They can be as elastic as rubber or as rigid as plastic. Where do we find them?
- Household products: furniture, toys, carpet, and electronics all contain polymers. Clothing often uses synthetic fabrics derived from polymers.
- Packaging: from the boxes on your doorstep to the bubble wrap the kids love, polymers are everywhere in packaging.
- Automobiles: polymers appear in seatbelts, fuel tanks, airbags, tires, and many other parts.
- Construction: polymers are used in pipes, insulation, flooring, roofing, windows, and doors.
- Medical: polymers are common in medical and surgical equipment and can make sterilization more efficient.
There’s more, but let’s get back to our subject and pick up engineering resin use cases later.
So, What Are Resins?
Now let’s add resins to the picture. Resins are a subset of polymers: viscous substances that can harden permanently, which makes them vital for creating durable materials. They come in two forms, natural (think plants) and synthetic (think chemical processing). We keep this short here because we cover natural and synthetic resins in depth in our Essential Guide to Resins. For this guide, the key point is how resins fit into the polymer family and what makes engineering resins special.
There are three broad categories of polymer resins:
- Thermoplastic Resins: can be heated and cooled repeatedly without harming their properties. Because the process is repeatable, they are recyclable. Examples include polyethylene (PE), polyvinyl chloride (PVC), and polystyrene (PS).
- Thermosetting Resins: undergo a chemical reaction when heated that permanently hardens them. The process cannot be reversed, so they are used where higher durability is required.
- Elastomers: a polymer resin type with high elasticity. They stretch and return to their original shape. Think rubber.
Because of their diverse properties, polymer resins are used extensively in manufacturing, packaging, automotive, construction, and healthcare.
So, Is a Resin a Polymer?
Yes. A resin is a type of polymer. Polymers are large molecules made of repeating structural units joined by covalent bonds, and resins are a subset of those: viscous substances derived from natural or synthetic sources. Put simply, all resins are polymers, but not all polymers are resins.
Synthetic resins are man-made polymers. They are common in industrial and commercial applications, in materials such as polycarbonate (PC), acrylonitrile butadiene styrene (ABS), and acrylonitrile styrene acrylate (ASA).
Resin Properties: What Sets Them Apart
Resin properties describe how a resin performs: its strength, heat resistance, flexibility, chemical resistance, and dimensional stability. These properties determine which resin fits which job. The ones engineers look at most:
- Mechanical strength and stiffness: how much load a resin can bear without deforming.
- Thermal resistance: how well a resin holds up to heat, important for under-the-hood and electronics uses.
- Chemical resistance: how well it withstands solvents, fuels, and other chemicals.
- Flexibility and impact resistance: how well it absorbs stress without cracking.
- Dimensional stability: how well it keeps its shape over time and temperature.
Engineering resins stand out because they are tuned for superior mechanical and thermal properties compared with commodity plastics.
Engineering Resins: The Main Course
Of course, we’d be remiss not to discuss thermoplastic polymers, more widely known as engineering resins. That’s our expertise. Polymer resins are the broad term; engineering resins are a more specific group of thermoplastic polymers with superior mechanical and thermal properties compared with commodity plastics. They are used in demanding applications thanks to their strength, temperature resistance, and durability.
Engineering Resin Uses
- Industrial equipment: used in bearings, gears, and other critical moving parts to reduce friction and add stiffness.
- Aerospace: PEEK is used for its low weight and high strength-to-weight ratio, often in aircraft interiors and cable insulation.
Automotive Industry and Engineering Resins
Engineering resins, including polyamides (nylons), are used in under-the-hood automotive applications for their ability to withstand high heat and harsh chemicals, in components like radiator end tanks, air intake manifolds, and engine covers. Engineering thermoplastics are increasingly central to the electric vehicle revolution, including in batteries and components. ABS/PC blends are widely used for their balanced toughness and heat resistance.
Construction Industry and Polymer Resins
Polymer resins have changed the way we build. From early stages through final details, they provide strong, durable results. Modified polymer resins serve as binders in polymer concretes: isophthalic polyester polymer concrete offers rapid hardening and acid resistance, and epoxy polymers are increasingly used to repair and retrofit concrete structures. PC/ABS offers load capacity that helps build gear mechanisms.
Polymer Suppliers and Why We’re Critical
Without polymer suppliers, distributing polymers and maintaining quality control would be chaotic. Suppliers produce and distribute raw polymers, resins, additives, and more, playing a crucial role in supply chains across plastics, rubber, construction, automotive, and medical devices.
We hope this guide helped level-set a complex but remarkable industry. Got questions? Contact us at info@prlresins.com or learn more about Polymer Resources.
Frequently Asked Questions
What are polymer resins?
Polymer resins are polymers in a form that can harden into solid materials. They include thermoplastics, thermosets, and elastomers, and they are used across manufacturing, packaging, automotive, construction, and healthcare.
Is a resin a polymer?
Yes. A resin is a subset of polymers, a viscous substance made of repeating molecular units that can come from natural or synthetic sources. All resins are polymers, but not all polymers are resins.
What is the difference between thermoplastic and thermosetting resins?
Thermoplastic resins can be melted and reshaped repeatedly, which makes them recyclable. Thermosetting resins harden permanently and cannot be remelted, which suits high-durability uses.
What are engineering resins?
Engineering resins are thermoplastic polymers with superior mechanical and thermal properties compared with commodity plastics. They are used in demanding automotive, aerospace, electronics, and medical applications.