Phase Behavior of I2S Single Graft Block Copolymer/Homopolymer Blends

Autor:	Jimmy W. Mays, Nikos Hadjichristidis, Lizhang Yang, Samuel P. Gido, Stergios Pispas
Rok vydání:	2001
Předmět:	Materials science Polymers and Plastics Polymer science Organic Chemistry Dispersity Inorganic Chemistry chemistry.chemical_compound Lamella (surface anatomy) chemistry Chemical engineering Phase (matter) Volume fraction Materials Chemistry Copolymer Lamellar structure Polystyrene Polymer blend
Zdroj:	Macromolecules. 34:4235-4243
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma001901v
Popis:	This work is part of an extensive study of model nonlinear block copolymer/homopolymer blends. Effects of graft molecular architecture on the morphology of block copolymer/homopolymer blends have been examined. The single graft Y-shaped block copolymers used in the study are I2S block copolymers, which have two low polydispersity (PDI) polyisoprene arms and one low PDI polystyrene arm joint at a single junction point. Previously reported linear diblock copolymer/homopolymer blend systems showed that the order−order transitions (OOTs) occur at about the same volume fractions as in pure linear diblock copolymers. The OOT occurs at the same volume fraction regardless of the direction from which it is approached, i.e., blending homopolymer A with a diblock which forms A cylinders in a B matrix to push it toward lamella or blending B homopolymer with a lamellar diblock to push it back toward cylinders. This study shows that when a homopolymer is blended with an I2S block copolymer, the OOTs split so that they ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2e2cc677df97b32b34d4a07daf51a185 https://doi.org/10.1021/ma001901v Zobrazit plný text záznamu