temperature or if a solid at room temperature it has a glass transition temperature and or softening temperature below room temperature often 0 u00b0 or u2212 20 u00b0 c plasticization is indicated by a reduction in tg of the composition compared to that of the neat organic polymer and or a softening or flexibilizing effect as indicated by a reduction in shore hardness and or a lowered flexural modulus respectively typically the combination of the organic polymer and the compound of structure i will have a tg of at least 5 u00b0 c lower at least 15 u00b0 c lower at least 30 u00b0 c lower or at least 50 u00b0 c lower than a tg of the neat polymer as measured by dsc according to astm d3418 or other dsc method a useful general procedure is as follows the sample is evaluated on a ta q200 instrument with refrigerated cooling and ta thermal advantage software ta instruments new castle del or equivalent using a ramp rate of 20 u00b0 c min samples are ramped from room temperature to 210 u00b0 c followed by a rapid quench samples are then reheated to 210 u00b0 c at a rate of 20 u00b0 c min glass transition temperature is measured on the second scan when used to perform a plasticizing function a compound of structure i preferably has viscosities less than about 500 centipoise cp at 25 u00b0 c the viscosity may be from about 1 cp to 250 cp or about 50 cp to 200.