Tensile modulus filled grades

LCPs maintain a highly-oriented molecular structure in both the molten and solid states. In general, such polymers are known as rodlike polymers, and exhibit extremely strong mechanical properties in the direction of molecular orientation. For example, unfilled grades of Type II LCPs exhibit tensile strength of 200 MPa and flexural modulus of 9 GPa (both values are of 3 mm thickness), which are values that cannot be reached even with glass filled conventional polymers. 

Improved impact strength and tensile properties of mineral-filled HDPE has been obtained by the provision of a graded modulus between the filler particles and the HDPE matrix. This is achieved by individual dispersion of the filler particles in the polymer matrix to eliminate the presence of weak aggregates, encapsulation of the individual dispersed particles with a resin sheath of finite thickness and modulus and strength characteristics intermediate between that of the filler and the polymer matrix and firm bonding of the encapsulating resin phase to both the filler and the HDPE matrix. 

LCPs ease of processing gives them the ability to fill long, narrow molds, which makes them eminently suitable for such high-performance parts as electronic connectors. They may have 138,000 kPas (20,000 psi) or more in tensile strength, with flexural modulus values up to 5 x 10 psi. They are available in grades with heat deflection temperatures (HDT) of about 357°C (675°F) at 1,820 kPas (264 psi). This family of different LCPs resists most chemicals and weathers oxidation and flame, making them excellent replacements for metals, ceramics, and other plastics. 

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