Polymers

Introduction to Polymers

Introduction to Polymer Classification The family of plastics materials is closely related to two other important families of manufacturing materials, textile fibres and elastomers (rubber), in that they are all based on carbon (organic materials) and they consist of extremely …

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Will Styrenic thermoplastics evolve further to meet design demands ?

Styrenic thermoplastics? In a multiple choice pre-test I used for short courses for industry, some candidates were surprised to find that polystyrene had been around as a commercial material longer than polyethylene, polypropylene and nylon.  Today polystyrene still commands 10% …

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Will Styrenic thermoplastics evolve further to meet design demands ?

What determines friction between thermoplastic components?

Friction is an important property for thermoplastics in bearings and gears but also has a part to play in assembly of plastic parts (snap-fit and interference-fit) and ejection during moulding. When two surfaces rub together the resisting force is the …

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What determines friction between thermoplastic components?

What makes medical grade plastics so special?

Toughness and transparency are important properties for the constituents of intravenous lines. However, chemical properties and biocompatibility are paramount for medical grade plastics, which, compared to normal grades, have to comply with a barrage of regulatory tests. This is achieved …

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What makes medical grade plastics so special?

What causes mouldings (and moulders) to be off-colour?

When mouldings are not the intended colour, the first thing to check is the raw material, particularly the dosing rate, if you are using masterbatch, and the quality of regrind. The change of colour may make the mouldings more yellow …

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What causes mouldings (and moulders) to be off-colour?

Where are Engineering Thermoplastics Blends going ?

Engineering Thermoplastics Blends? The timeline of appearance of materials for the plastics industry can be viewed as several overlapping phases. The industry started with natural materials such as horn and bone, which can be thermoformed.  Next came chemical modification of …

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Where are Engineering Thermoplastics Blends going ?

Understanding the difference between SBS & SEBS thermoplastic elastomers?

The difference between SBS and SEBS thermoplastic elastomers explained. Over half a century ago, as I watched a fellow research student produce fascinating colours in his reaction vessel, as he prepared block copolymers using anionic polymerisation, little did I realise …

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Understanding the difference between SBS & SEBS thermoplastic elastomers?

Is MFR really much help to moulders these days ?

 Melt Flow Rate (MFR) Often a moulder has to change material grades. One of the first properties to be consulted on the new data sheet is usually the MFR. This is to establish if the new grade has the same …

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Is MFR really much help to moulders these days ?

What gives Moulders a Warped View on Life?

Warping is one of the most frustrating injection moulding faults. This is because it does not always appear immediately, the causes are complex and prevention is difficult. It is easy to say that the cause is differential shrinkage. However, the …

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What gives Moulders a Warped View on Life?

Colour your thinking on the Optical Properties of Thermoplastics

This article on the Optical Properties of Thermoplastics was written by Dr.Charlie Geddes for Hardie Polymers. In a previous blog we looked at what determines transparency in thermoplastics but what about colour? Very few commercial polymers have chemical groups (chromophores) which …

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Colour your thinking on the Optical Properties of Thermoplastics

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