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- W4308404919 abstract "Core cross-linked star (CCS) copolymers were prepared by reversible addition–fragmentation chain-transfer polymerization according to the arm-first technique and studied as viscosity index improvers for the application in hydraulic lubricants. A one-pot two-step synthetic procedure was optimized: starting from PMA arms with a precisely controlled structure and three different molecular weights and using different amounts of either divinylbenzene or ethylene glycol dimethacrylate as cross-linking agents, CCS copolymers with a high star yield (63 to 88%) were obtained. CCS copolymers present weight average molecular weight values ranging from 130,000 to 420,000 g mol–1 and a number of arms comprised between 4 and 13. All samples were employed, without any purification step, in the preparation of model lubricant formulations for hydraulic fluid applications. A good compromise between viscosity index improvement and capability to resist chain breaking reactions was obtained for CCS copolymers with target molecular weight for the PMA arms of 20,000 g mol–1. Improved performances with respect to a commercial additive were obtained." @default.
- W4308404919 created "2022-11-11" @default.
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- W4308404919 date "2022-11-07" @default.
- W4308404919 modified "2023-10-14" @default.
- W4308404919 title "Core-Crosslinked Star Copolymers as Viscosity Index Improvers for Lubricants" @default.
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- W4308404919 doi "https://doi.org/10.1021/acsapm.2c01039" @default.
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