Patent ID: 7803629

Claim:
A method of determining a value of a physical or chemical property of at least one polymer test sample, the at least one polymer test sample having a molecular weight distribution (MWD) profile and a short chain branching distribution (SCBD), comprising: a) providing at least two polymer training samples, each training sample having a MWD profile, a SCBD, and a known value of the respective physical or chemical property; b) determining at least two weighted cross terms at respective molecular weights along the MWD profile and the SCBD, for each of the at least two polymer training samples and the at least one polymer test sample, each weighted cross term being determined as the multiplication product of: (1) the respective molecular weight; (2) the weight fraction at the respective molecular weight; and (3) the number of short chain branches per 1000 carbon atoms at the respective molecular weight; c) plotting each weighted cross term versus the logarithm of the respective molecular weight for each of the at least two polymer training samples and the at least one polymer test sample; d) determining the respective area under each curve in step c); e) correlating the respective areas for each of the at least two polymer training samples in step d) with the known value of the respective physical or chemical property; and f) applying the correlation of step e) to the respective area of the at least one polymer test sample to determine the value of the physical or chemical property of the at least one polymer test sample.