Correction of detector response

The responses of the usual concentration detectors may be influenced by the copolymer composition as well as the concentration. An RI detector is a concentration detector, and a response obtained from it must be corrected before the calculation of molecular mass and MMD. The additivity of the refractive index increment may be assumed, and the refractive index increment for a copolymer AB can be written as [32]  

The densimeter is less sensitive to the effects of variations in copolymer composition than RI and UV detectors [39]. Response correction for the calculation of molecular mass averages is therefore not required. 

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