01445nas a2200169   4500008004100000022001400041245008800055210006900143260007100212300001400283490000700297520079000304100001801094700002301112700002701135856011301162       2011                        eng d  a0024-929700aPhase separation of DMDBS from PP: effect of polymer molecular weight and tacticity0 aPhase separation of DMDBS from PP effect of polymer molecular we  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR  a2358-23640 v443 a<p>We report an unexpected dependence of DMDBS phase separation temperature on the molecular weight of the matrix isotactic polypropylene (iPP). DMDBS crystallizes out at lower temperatures for iPP with decreasing molecular weight (and correspondingly lower tacticity). All the iPPs in our study are reasonably high molecular weight samples and there is no molecular weight dependence of their solubility parameter. Therefore, the decrease in DMDBS phase separation temperature for lower molecular weights cannot be rationalized using thermodynamic arguments. This molecular weight dependence appears to be unique to isotactic polypropylene and is not observed for either syndiotactic polypropylene or for random copolymers of isotactic polypropylene containing ethylene comonomer.</p>1 aSreenivas, K.1 aBasargekar, Rajeev1 aKumaraswamy, Guruswamy  uhttps://library.ncl.res.in/content/phase-separation-dmdbs-pp-effect-polymer-molecular-weight-and-tacticity-0