Miscellaneous properties

MCLCPs have excellent resistance to a wide range of organic solvents and exhibit very good hydrolysis resistance, and the retention of properties in both acidic and basic environments is very good As with gas barrier properties it is likely that the liquid-crystalline order is responsible for this excellent chemical resistance, and again it is found that the chemical resistance of MCLCPs decrease if kinks are introduced into the backbone. 

One of the major brakes on the expansion of the MCLCP market has been the relatively high cost of the polymers resulting from expensive feedstocks, and considerable research activity in industry has centred on attempting to lower monomer costs. In addition to this there has also been considerable effort blending MCLCPs with other thermoplastics with the objective of combining the optimum properties of both components while producing the most cost-effective material for a given application. An example of this is a MCLCP/nylon blend which exhibits a very low coefficient of thermal expansion. The blends area is likely to be an area of major market activity for MCLCPs in the future. 

The author would like to thank Drs D.J. Blundell, I.S. Miles, R.A. Chivers, A.H. Windle and A.M. Donald for helpful comments in the preparation of this chapter. 

Goodman, I., McIntyre, J.E. Stimpson, J.W., British Patent 989552, 1962 (Imperial Chemical Industries). 

A comparison of the binding energies with the net charges calculated by the CNDO/2 method (Table XXXVI) has shown531 a linear relationship between these two quantities for the carbon atoms of the nucleic acid bases (except for the C-5 carbons of cytosine and thymine) as well as for the nitrogens. However, these last relationships are less satisfactory than the previous ones.528 

Other attempts to correlate experimental binding energies with molecular-charge distributions have been made. Kato et al.532 have derived a correlation formula between the chemical shift of the inner-shell electron of a molecule and the charges both on the ionized and other atoms (cf. ref. 529). Very recently Ishida et al.533 reported an 

Gelius, B. Roos and P. Siegbahn, Chem. Phys. Lett. 4, 471 (1970). 

Comparison between Experimental Binding Energies and Theoretical Quantities 

In Sections II and IV we have described the application of NMR and NQR spectroscopy to the determination of the localization of mobile protons of the pyrimidine bases and for the prediction of the tautomeric structures of these molecules. Here, we shall describe the application of these spectroscopies to the elucidation of the electronic structures of the most stable tautomeric forms of the bases. 

The pyrognostk tests also called/ire assays are simple qualitative laboratory techniques used by mineralogists in the field or in a laboratory to indentify quickly without complex equipment the chemical elements present in an unknown mineral sample. Five major types of fire assays are used  

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The last part of the file presented here is a properties block, which can contain miscellaneous properties extensively described in Refs. [50, 51]. In most cases, however, this block is empty, except for a terminating line (line 18 in Figure 2-25). 

Miscellaneous Properties. The acoustical properties of polymers are altered considerably by their fabrication into a ceUular stmcture. Sound transmission is altered only slightly because it depends predominandy on the density of the barrier (in this case, the polymer phase). CeUular polymers by themselves are, therefore, very poor materials for reducing sound transmission. They are, however, quite effective in absorbing sound waves of certain frequencies (150) materials with open ceUs on the surface are particulady effective. The combination of other advantageous physical properties with fair acoustical properties has led to the use of several different types of plastic foams in sound-absorbing constmctions (215,216). The sound absorption of a number of ceUular polymers has been reported (21,150,215,217). 

Miscellaneous Properties. Other properties such as viscosities, solidification temperature, pour poiat, and cubical rate of thermal expansion are aH important for the tank designer or operator to consider and understand. 

Miscellaneous Properties Dipole Moments Magnetic Properties... 

TABLE 2-353 Saturated Liquid Water—Miscellaneous Properties... 

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