average molecular weight m n or as weight average molecular weight m w which unless stated otherwise are determined by gel permeation chromatography gpc against polystyrene standards the degree of polymerization n means the number average degree of polymerization unless stated otherwise given as n m n m u wherein m u is the molecular weight of the single repeating unit unless stated otherwise percentages of solids are per cent by weight u201c wt u201d percentages or ratios of liquids like e g in solvent mixtures are per cent by volume u201c vol u201d and all temperatures are given in degrees celsius u00b0 c unless stated otherwise concentrations or proportions of mixture components like the conductive additives given in percentages or ppm are related to the entire formulation including the solvents the partition ratio log p in the literature also referred to as u201c partition coefficient u201d of a compound or material is given by equation 1 log p log a oct a aq 1 wherein a oct is the concentration of the compound or material in octanol and a aq is the concentration of the compound or material in water see iupac compendium of chemical terminology electronic version pac 1993 65 2385 and c hansch acc chem res 2 232 1969 in case of a solvent blend which comprises two or more solvents the partition ratio of the blend is defined as the weighted average log p.