ISSN:
0887-6266
Keywords:
surface segregation
;
polyolefin copolymers
;
deuterium labeling effect
;
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
We have examined the effect of deuterium labeling on surface interactions in mixtures of random olefinic copolymers [C4H8]1-x[C2H3(C2H5)]x. Based on surface segregation data we have determined a surface energy difference χs between pure blend constituents. In each binary mixture components have different fractions x1, x2 of the group C2H3(C2H5), and one component is labeled by deuterium (dx) while the other is hydrogenous (hx). The mixtures are grouped in four pairs of structurally identical blends with swapped labeled constituent (dx1/hx2, hx1/dx2). For each pair the surface energy parameter χs increases when the component with higher fraction x is deuterated, i.e., χs(dx1/hx2) 〉 χs(hx1/dx2) for x1 〉 x2. A similar pattern has been found previously for the bulk interaction parameter χ. This is explained by the solubility parameter formalism aided by the lattice theory relating the surface excess to missing-neighbor effect. χs has also an additional contribution, insensitive to deuterium swapping effect, and related to entropically driven surface enrichment in a more stiff blend component with a lower fraction x. Both enthalpic and entropic contributions to χs seem to depend on the extent of chemical mismatch between blend components. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 2691-2702, 1998
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
