TY - JOUR
T1 - Crystallization-induced phase separation in mixtures of model linear and short-chain branched polyethylenes
AU - Ueda, Masaya
AU - Register, Richard A.
N1 - Funding Information:
funds from the Polymers Program of the National Science Foundation
Funding Information:
Dr. P. Rangarajan, Mr. D. J. Quiram, and Mr. D. M. Dean of Princeton University for assistance in sample preparation and characterization. Principal support for this research was provided by Mitsubishi Chemical Corporation through a fellowship to M.U. Acquisition of the DSC was made possible by a grant from the AT&T Education Foundation and matching
PY - 1996
Y1 - 1996
N2 - The possibility of cocrystallization is investigated in a model system of linear and short-chain branched polyethylene. Both components have low molecular weight and narrow molecular weight distribution; the branched component, hydrogenated polybutadiene (HBD), contains one ethyl branch per 60-70 backbone carbon atoms. Cocrystallization was not observed even for the most rapid cooling conditions attainable, despite the essentially identical unit cells of the two materials. A combination of microscopy and scattering techniques was used to demonstrate that the HBD and linear polyethylene (LPE) crystallize into separate lamellar stacks. The rapid growth rate of the LPE creates volume-filling spherulites which trap the HBD in micron-size inclusions, within which it subsequently crystallizes on further cooling.
AB - The possibility of cocrystallization is investigated in a model system of linear and short-chain branched polyethylene. Both components have low molecular weight and narrow molecular weight distribution; the branched component, hydrogenated polybutadiene (HBD), contains one ethyl branch per 60-70 backbone carbon atoms. Cocrystallization was not observed even for the most rapid cooling conditions attainable, despite the essentially identical unit cells of the two materials. A combination of microscopy and scattering techniques was used to demonstrate that the HBD and linear polyethylene (LPE) crystallize into separate lamellar stacks. The rapid growth rate of the LPE creates volume-filling spherulites which trap the HBD in micron-size inclusions, within which it subsequently crystallizes on further cooling.
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U2 - 10.1080/00222349608220374
DO - 10.1080/00222349608220374
M3 - Article
AN - SCOPUS:0040526318
SN - 0022-2348
VL - 35
SP - 23
EP - 36
JO - Journal of Macromolecular Science - Physics
JF - Journal of Macromolecular Science - Physics
IS - 1
ER -