@article{dd344d767efe48678f2470b3eb17069d,
title = "Mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam).",
abstract = "Mesoporous silica particles were grafted with thermoresponsive poly(ethyleneoxide-b-N-vinylcaprolactam), PEO-b-PVCL. N-vinylcaprolactam was first polymd. on particle surfaces using surface initiated atom transfer radical polymn. (SI-ATRP) and then, the poly(ethyleneoxide) blocks were attached to the PVCL chain ends with click chem. The sizes, thermoresponsiviness, and colloidal stability of SiO2-PVCL and SiO2-PVCL-b-PEO particles and their aq. dispersions were studied by SEM, turbidimetry, dynamic light scattering, zeta sizer, and microcalorimetry. The phase sepn. temp. of the PEO-b-PVCL grafted particles did not considerably differ from that of the SiO2-PVCL particles. The zeta potential of the grafted particles was close to zero at room temp. but decreased strongly upon heating. The decrease is related to the collapse of the PVCL blocks and correspondingly, the exposure of the silica surface toward the aq. phase. The colloidal stability of the particles could be enhanced by adding PEO blocks to the chain ends of the PVCL grafts. {\^A}{\textcopyright} 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013. [on SciFinder(R)]",
keywords = "Polymerization (atom transfer, radical, surface initiated, mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)), Polyoxyalkylenes Role: POF (Polymer in formulation), PRP (Properties), SPN (Synthetic preparation), PREP (Preparation), USES (Uses) (block, diblock, Click chemistry, Dispersion of materials, Mesoporous materials, Particle shape, Particles, Phase separation, Phase transition enthalpy, Polymer brushes, Polymer chains, Zeta potential (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)), Polyoxyalkylenes Role: RCT (Reactant), RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)), Polymer morphology (phase, mesoporous, silica, particle, grafted, poly, ethyleneoxide, vinyl, caprolactam",
author = "Mikko Karesoja and Jason McKee and Erno Karjalainen and Sami Hietala and Lotta Bergman and Mika Linden and Heikki Tenhu",
note = "Copyright (C) 2014 American Chemical Society (ACS). All Rights Reserved.; Section Code: 35-7; CA Section Cross-references: 37; CODEN: JPACEC; CAS Registry Numbers: 7631-86-9P (Silica) Role: MOA (Modifier or additive use), POF (Polymer in formulation), PRP (Properties), RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), USES (Uses), RACT (Reactant or reagent) (SiO2-PVCL and SiO2-PVCL-b-PEO-grafted, polymer brushes; mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 1198601-55-6P (Ethylene oxide-N-vinylcaprolactam diblock copolymer) Role: PRP (Properties), SPN (Synthetic preparation), PREP (Preparation) (comprised of actual and assumed monomers; mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 54622-44-5 Role: CAT (Catalyst use), USES (Uses) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 6089-09-4 (4-Pentynoic acid); 25322-68-3 (PEO); 255727-67-4 (11-(2-Bromo-2-meth- yl)propionyloxyundecyltrichlorosilane)) Role: RCT (Reactant), RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 956492-61-8P Role: RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 14343-69-2 (Azide) Role: RGT (Reagent), RACT (Reactant or reagent) (mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 25189-83-7P (N-Vinylcaprolactam homopolymer) Role: PRP (Properties), RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (silica-grafted; mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam)); 25189-83-7DP (N-Vinylcaprolactam homopolymer) Role: RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (silica-grafted; mesoporous silica particles grafted with poly(ethyleneoxide-block-N-vinylcaprolactam))",
year = "2013",
doi = "10.1002/pola.26928",
language = "English",
volume = "51",
pages = "5012--5020",
journal = "Journal of Polymer Science, Part A: Polymer Chemistry",
issn = "0887-624X",
publisher = "John Wiley & Sons Inc.",
number = "23",
}