Torlon®

TORLON, Brochure D0881, Amoco Chemicals Coip., Chicago, Bl. 

Amoco TORLON Engineering Resins, Data Sheet Grade 7130, Code Numbei AT-14, Chicago, Bl., Eeb. 1982. 

Some typical properties of a fabricated solid grade (Vespel-Du Pont) are given in Table 18.13 together with some data on a graphite-loaded variety and a commercial polyamide-imide (Torlon 2000—Amoco). 

Property Units ASTM test Vespel, unfilled Vespel, 15% graphite filled Torlon 2000, unfilled... 

If trimellitic anhydride is used instead of pyromellitic dianhydride in the reaction illustrated in Figure 18.35 then a polyamide-imide is formed (Figure 18.37). The Torlon materials produced by Amoco Chemicals are of this type. 

Torlon-type polymers are unaffected by aliphatic, aromatic, chlorinated and fluorinated hydrocarbons, dilute acids, aldehydes, ketones, ethers and esters. Resistance to alkalis is poor. They have excellent resistance to radiation. If a total of 10 Mrad is absorbed at a radiation dosage of 1 Mrad/h the tensile strength decreases by only 5%. 

Fig. 3.14. Relative linear thermal expansion coefficient of (1) Invar, (2) Pyrex, (3) W, (4) Ni, (5) Cuo.7Ni03, (6) stainless steel, (7) Cu, (8) brass, (9) Al, (10) Torlon, (11) soft solder, (12) Vespel SP-22, (13) Hg, (14) In, (15) Araldite, (16) Stycast 1266, (17) PMMA, (18) Nylon, (19) Teflon [60]. Some additional data are Ag between (8) and (9) Stycast 2850 GT slightly larger than (9). The integral contraction between 300 and 4K is 103AL/L = 11.5, 4.2, 6.3 and 5.7 for Stycast 1266, Stycast 2850 GT, Vespel SP-22 and solders...

The measurement of the thermal conductivity of Torlon has been carried out on a sample whose shape and dimensions are shown in Fig. 11.12. 

The thermal conductivity data for Torlon, presented in Fig. 11.15, are typical of amorphous polymers. In particular, they show ... 

Fig. 11.14. Thermal conductivity of Torlon 4203 in the temperature range 4.2-300 K. The dashed line represents... 

As regards these data, in the 30-250 K range, the thermal conductivity of Torlon can be well represented by ... 

The thermal resistance between the ends of the sample and the copper blocks must be negligible compared with the thermal resistance of the sample. This assumption must be verified especially for short samples at low temperature where the contact resistance is higher. For this reason, a second measurement of the thermal conductivity of Torlon in the 4.2-25 K range was carried out. The second sample had a different length (L = 24.51 mm) and the same section A. This additional measurement gave the same value of k within 2%. Moreover, we see from Fig. 11.15 that data of thermal conductivity at 4.2 K well join data at lower temperatures (within 3%) obtained on a sample of much smaller geometrical factor and with a different method (integrated thermal conductivity method) and a different apparatus [38], Finally, at room temperature, we find k = 0.26 W/mK, which is the data sheet value. 

The sample was in the shape of a slab of 10.03 x 3.38 x 0.43cm3 and a mass m = 19.88 g. The Torlon slab was enveloped in a 7 xm Cu foil glued on the whole sample area by means of a thin layer of diluted GE 7031 Varnish in order to get an isothermal sample. The internal thermalization time of the enveloped sample was evaluated to be [32] ... 

Cu frame Torlon sample 7 pm Cu foil NbTi wires... 

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