Nylon reinforced with glass fiber

Nylons reinforced with glass fibers are thus widely used in domestic appliances, in housings and casing, in car components, including radiator parts, and in the telecommunication field for relay coil formers and tag blocks. Glass-bad-filled nylons have found use in bobbins. Carbon-fiber reinforcement has been used with nylon-6 and nylon-6-nylon-12 mixtures. These materials have found use in the aerospace field and in tennis rackets. 

The use of polyol rubber blocks In NBC gave unexpected Increase In moisture absorption over that of nylon 6. The effect of absorption on linear expansion Is shown In Figure 7 for three types of polyol blocks. Polyol level was 20% of copolymer. Polyols A and B not only Increased the total moisture absorption, but greatly Increased the rate of absorption as well. Reinforcement with glass fiber will give further improvement in dimensional stability, as illustrated below, but the degree of improvement is Insufficient to meet specifications for critical applications. 

A third polyol variation (Curve C) gave a further significant decrease in moisture expansion. Use of Polyol C not only decreased the amount absorbed, but the rate of absorption as well. The absorption rate of Polyol C copolymer was identical to nylon 6. The dimensional stability of this copolymer appears to be sufficient for most applications, when reinforced with glass fiber. 

E. Basavaraj, B. Ramaraj and A Siddaramaiah., Study on Mechanical, Thermal, and Wear Characteristics of Nylon 66/Molybdenum Disulfide Composites Reinforced With Glass Fibers, Polymer Composites, 2012, 1570. 

Nylon MXD/6 (poly-m-xylyleneadipamide) n. A type of nylon with lower elongation at break than nylon-6 or 6/6, but capable of attaining their properties by reinforcement with glass fibers. The resin has low melt viscosity, good flexural strength and modulus, and resists alkalies and hydrolytic degradation. 

Image of water in pultiuded nylon rode reinforced with glass fibers... 

Figure 6.4 Image of water in pultruded nylon rods reinforced with glass fibers and a contour plot of image showing the presence of a tubular void T...

Basically, PBT seems to have a unique and favorable balance of properties between nylons and POM resins. It has relatively low moisture absorption, extremely good self-lubrication, fatigue resistance, solvent resistance, and good maintenance of mechanical properties at elevated temperatures. When PBT was reinforced with glass fiber it has excellent maintenance of properties up to its crystal melting point. Key markets include under-the-hood automotive applications, which require thermal and solvent resistance, electrical and electronic applications, power tools, small and large appliance components, and athletic goods. 

Nylon family These are polyamides resulting fi-om the condensation reaction of an amine funetion and an acid function. As a family, they are tough and hard. They are resistant to many liquids and have low coefficients of thermal expansion. They ean be reinforced with glass fibers, carbon, and minerals. Applications include molded parts for electrieal power transmission, molded parts for a wide range of automotive functions, pulleys, bearings and items which need good abrasion resistance and toughness. 

Synthetic stocks are gradually replacing the traditional wooden stock due to their cheapness, ease of manufacture, lighter weight, and wear ability, and are claimed to be more stable and easier to maintain than wooden stocks. Materials such as nylon, polyurethane, fiberglass, Kevlar reinforced with fiberglass or carbon fiber, or thermoplastic resin reinforced with glass and ceramics may be used. The stocks may be hollow, or have a hollow filled... 

Reinforcements. Both the resole and novolac compounds use a broad array of reinforcements to meet the demands of the market place wood flour, cotton flock, minerals, chopped fabric. Teflon, glass fibers (long and short), nylon, rubber, and kevlar. Asbestos, which had been a widely used filler in many thermosetting compotmds, has been replaced over the past 20 years with glass fiber-reinforced phenolic compounds in many applications. 

Since nylon is the matrix phase, the glass fiber-reinforced SPS/nylon blends contain glass fibers that are surface treated to be compatible with nylon. 

It is well known that nylon-based materials absorb water and that this affects properties and results in moisture growth. In this section, the amount of moisture absorbed and resultant moisture growth for glass fiber-reinforced SPS/ nylon blends is compared with glass fiber-reinforced nylon. 

Figure 16.6 Skew of a wall of a divided tray, right after injection molding with glass fiber-reinforced SPS/nylon blends versus glass fiber-reinforced SPS and PBT.

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