The characterization of linear polyethylene SRM 1475. X. Gel permeation chromatography

Abstract

TABLE 1. VaLLLes oj nLLmber-average moLecLLLar weight, Mn, and second vi riaL coefficient , At , Jor soLLLtions oj poLyethyLene in 1-chLoronaphthaLene at 130 C , inJerred Jrom meaS ltrements oj osm otic press ure, 1T, versus concentration, c, by Linear Least-sqLLares fit oj the data to the Jorm (1T/C ) 1/2 = (RT/Mn ) 1/2 (1 + MnA2 c/2), where R and T a re the gas co nstant per moLe a nd the absoLute temperatLLre, respectiveLy. Nu m ber in pare nth eses fo llo win g th e Mit val ues a re the standa rd deviations in Mit ob tain ed from th e lin ea r leas t-squares a na lyses. The la st column s hows the number of solut ion conce ntrations at whi c h eac h sa mpl e was meas ure d. A2 X 10", N umber of Sampl e Mil mol c m"/g2 conce ntrati ons PE 7 .. . ...... . . 7,730( 10 ) 15. 78 4 PE 15 . ..... .. .. 13,500 (60) 11. 48 5 PE 20 .......