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DMA of Polyamide under the Influence of Humidity

Polyamide is a very versatile material. It can be formed into fibers that are used in the textile industry as well as for ropes, surgical threads and the strings of plucked instruments. Furthermore, machine parts that have to be abrasion resistant (e.g. housings, slide bearings, gearwheels or rollers) are often made of polyamide. Because of its resistance to high temperatures, lubricants and solvents, polyamide can also be used to produce intake manifolds, fuel lines, engine covers and the oil pans of motor vehicles. The measurements are carried out using an MCR Rheometer equipped with a convection temperature device.

Introduction

Polyamide is a very versatile material. It can be formed into fibers that are used in the textile industry as well as for ropes, surgical threads and the strings of plucked instruments. Furthermore, machine parts that have to be abrasion resistant (e.g. housings, slide bearings, gearwheels or rollers) are often made of polyamide. Because of its resistance to high temperatures, lubricants and solvents, polyamide can also be used to produce intake manifolds, fuel lines, engine covers and the oil pans of motor vehicles.

It is well known that water can penetrate polymers in general, and polyamide in particular, through the amorphous phase. In polyamide, both liquid water and water vapor can be absorbed from the surroundings in a proportion approaching 9 % by weight. Water weakens hydrogen bonds between neighboring amide groups and lifts the steric hindrance of the polymer chains, which decreases stiffness but increases flexibility. 

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