POLYESTER RESIN

 

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Polyester is a category of polymers, or, more specifically condensation polymers, which contain the ester functional group in their main chain. Usually, polyester refers to cloth woven from polyester fiber. Polyester clothing is generally considered to have a "less natural" feeling to it compared to natural fibers. Polyester fibers are often spun together with fibers of cotton, producing a cloth with some of the better properties of each.

 

Although polyesters do exist in nature (e.g., in the Cutin of the Plant Cuticle), polyester generally refers to the large family of synthetic polyesters (plastics) which includes polycarbonate and above all polyethylene terephthalate (PET). PET is one of the most important thermoplastic polyesters.

 

Extreme care with fire around polyester should be exercised, as polyester is extremely flammable and flames can leap from a match to polyester at a range of at least three inches (7.5 cm).

 

 

 

 

Applications

 

Polyester is the most widely used manufactured fiber in the United States. Woven fabrics are used for apparel and home furnishings. These include bed sheets, bedspreads, curtains and draperies. Polyester used in knitted fabrics include shirts and blouses. Fiberfill is also used to stuff pillows, comforters and cusion padding.

 

The first synthetic polyester, glycerine phthalate, was used in the First World War for waterproofing. Natural polyesters have been known since around 1830.

 

Polyesters are used to make bottles, films, liquid crystal displays, holograms, filters, dielectric film for capacitors, film insulation for wire and insulating tapes.

 

Liquid crystalline polyesters are among the first industrially used liquid crystalline polymers. In general they have extremely good mechanical properties and are extremely heat resistant. For that reason, they can be used as an abradable seal in jet engines.

 

Thermosetting polyester resins are commonly used as casting materials, fiberglass laminating resins, and non-metallic auto-body fillers. In such applications, polymerization and cross-linking are initiated through an exothermic reaction involving an organic peroxide, such as methyl ethyl ketone peroxide or benzoyl peroxide.

 

 

Resin

 

Polyesters are one of the least expensive resins available to the FRP boat builder utilizing female tooling in the form of a mold. Polyester has the advantage of being extremely inexpensive when compared with other thermoset resins i.e. vinylesters and epoxies. If the upside is cheap pricing, the down side includes poor adhesions, high water absorption, high shrinkage, and high VOC's. Polyester resins are only compatible with fiberglass fibers. Polyester is best suited for applications insensitive to weight and do not require high adhesion or fracture toughness. For instance if a simple inexpensive solid fiberglass part must be fabricated in open tooling in one operation and requires no secondary bonding. If shape accuracy is not critical, resistance to water is of no concern, and ventilation of the workspace is excellent, then polyester's a great candidate. 

 

Polyesters historically exhibit poor performance in the areas of adhesion and elongation, rendering the finished part prone to micro cracking and secondary bond failures. These parameters become more important when we consider adhering dissimilar materials within the same part or welding any materials that are not the usual fiberglass strand substrate. Finished polyester hulls are still suffering from osmotic blistering when untreated by an epoxy barrier coating against water. Boat yards are filled with hull and superstructures suffering from massive areas of core disbonding or delamination resulting from an adhesive mismatch with the industry at large (i.e. depending on polyester as an adhesive).

 

 

Properties

 

Polyester has excellent durability, abrasion resistance, tenacity and high elongation. The fiber also has high appearance retention, dimensional stability, elastic recovery and excellent resiliency. It remains very strong when it is wet. However, polyester ranks very poorly in comfort and absorbency.

 

Filament fibers can be bright, delustered, or have high or low tenacity. Staple fibers can range in deniers as well as the degree in which they pill.

 

 

Aesthetics

 

The fiber blends well with other fibers and maintains a natural look. Polyester can be engineered to be very similar in appearance and hand to wool, linen and silk.

 

The low absorbency causes the fabric to be very uncomfortable. This can be improved through blending it with other fibers. Static can be controlled through additives and changes in the compound.

 

 

Environmental impact

 

The impact is very similar to that of nylon. Polyester is extensively recycled, and less pollution is created when the recycled fibers are reengineered than when new ones are created.

 

 

History

 

Terylene was the first polyester fiber and was produced in England. It was brought to the U.S. in 1951 by DuPont under the trade name Dacron.

 

 

Synthesis

 

Synthesis of polyesters is generally achieved by a polycondensation reaction. See "condensation reactions in polymer chemistry".

 

 

 

PRODUCTION MOULDING and GLASS FIBRE REPAIRS

 

 

 

 

CUSTOM MOLDING & REPAIR SERVICE

 

British Composites specialise in producing quality GRP (glass) and CRE (carbon) fiber mouldings, production laminating and repairs using polyester, vinalester and epoxy resins, to our customers requirements.

 

 

 

Send us details of your project by email - or telephone

 

 

We can develop your ideas through the pattern & mould making stages to the finished product, on a one off or a production basis.

 

We are also committed to working closely with our customers to provide them with a service that will meet with all their requirements. The majority of our work is moulding, we nevertheless have strong ties to the marine industry, in the way of repairs modifications and manufacture.

 

During our time in the GRP industry we have manufactured a diverse range of products, These include theme park animals, planters, architectural mouldings, guards/covers, automotive components, models, slides, boats and more.

 

We repair classic racing cars and also produce fibreglass parts by skilled craftsmen with 25 years experience in the trade.

 

In most cases, we will advise by return and if unable to assist, do our very best to put you in touch with an alternative service.

 

 

 



British Composites Limited
The Old Steam House
Herstmonceux, East Sussex. 
BN27 1RF

 

Contact: Nelson Kruschandl

Tel: +44 (0)1323 831727

Mobile: +44 (0)7905 147709

 

nelson @ solarnavigator.net

 


 

 

 

 

 

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