What is difference between PEG 4000 and PEG1000 in polarity?

which one is more polar? I work on nanaoprticles ,included in microparticles like PEG 4000 and PEG 1000. After analyzing their size, PEG 4000 had minimum size. but I dont know exaclty why? be...

16 May 2019 5,250 7 View