TY - JOUR
T1 - Entropically driven phase separation of highly branched/linear polyolefin blends
AU - Chen, Ying Ying
AU - Lodge, Timothy P.
AU - Bates, Frank S.
N1 - Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2000/11/15
Y1 - 2000/11/15
N2 - Small-angle neutron scattering (SANS) was used to examine the melt phase behavior of a heavily branched comb PEE polymer blended separately with two linear PEE copolymers. In this case, PEE refers to poly(ethylene-r-ethylethylene) with 10% ethylene units; therefore, the molecular architecture was the only difference between the two components of the blends. The molecular weights of the two linear random copolymers were 60 and 220 kg/mol, respectively. The comb polymer contained an average of 54 long branches, with a molecular weight of 13.7 kg/mol, attached to a backbone with a molecular weight of 10 kg/mol. Three different volume compositions (25/75, 50/50, and 75/25) were investigated for both types of blends. SANS results indicate that all the blends containing the lower molecular weight linear polymer formed single-phase mixtures, whereas all the blends containing the high molecular weight linear polymer phase-separated. These results are discussed in the context of current theories for polymer blend miscibility.
AB - Small-angle neutron scattering (SANS) was used to examine the melt phase behavior of a heavily branched comb PEE polymer blended separately with two linear PEE copolymers. In this case, PEE refers to poly(ethylene-r-ethylethylene) with 10% ethylene units; therefore, the molecular architecture was the only difference between the two components of the blends. The molecular weights of the two linear random copolymers were 60 and 220 kg/mol, respectively. The comb polymer contained an average of 54 long branches, with a molecular weight of 13.7 kg/mol, attached to a backbone with a molecular weight of 10 kg/mol. Three different volume compositions (25/75, 50/50, and 75/25) were investigated for both types of blends. SANS results indicate that all the blends containing the lower molecular weight linear polymer formed single-phase mixtures, whereas all the blends containing the high molecular weight linear polymer phase-separated. These results are discussed in the context of current theories for polymer blend miscibility.
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U2 - 10.1002/1099-0488(20001115)38:22<2965::AID-POLB120>3.0.CO;2-A
DO - 10.1002/1099-0488(20001115)38:22<2965::AID-POLB120>3.0.CO;2-A
M3 - Article
AN - SCOPUS:0034320756
VL - 38
SP - 2965
EP - 2975
JO - Journal of Polymer Science, Part B: Polymer Physics
JF - Journal of Polymer Science, Part B: Polymer Physics
SN - 0887-6266
IS - 22
ER -