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- W2796857029 abstract "The linear viscoelastic behavior of poly(norbornene)-graft-poly(±-lactide) was investigated as a function of grafting density and overall molar mass. Eight sets of polymers with grafting densities ranging from 0 to 100% were synthesized by living ring-opening metathesis copolymerization. Within each set, the graft chain molar mass and spacing between grafts were fixed, while the total backbone length was varied. Dynamic master curves reveal that these polymers display Rouse and reptation dynamics with a sharp transition in the zero-shear viscosity data, demonstrating that grafting density strongly impacts the entanglement molar mass. The entanglement modulus (Ge) scales with inverse grafting density (ng) as Ge ∼ ng1.2 and Ge ∼ ng0 in accordance with scaling theory in the high and low grafting density limits, respectively. However, a sharp transition between these limiting behaviors occurs, which does not conform to existing theoretical models for graft polymers. A molecular interpretation based on thin flexible chains at low grafting density and thick semiflexible chains at high grafting density anticipates the sharp transition between the limiting dynamical regimes." @default.
- W2796857029 created "2018-04-24" @default.
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- W2796857029 date "2018-04-12" @default.
- W2796857029 modified "2023-10-17" @default.
- W2796857029 title "Consequences of Grafting Density on the Linear Viscoelastic Behavior of Graft Polymers" @default.
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- W2796857029 doi "https://doi.org/10.1021/acsmacrolett.8b00116" @default.
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