Thermal property changes of poly(N-isopropylacrylamide) microgel particles and block copolymers
نویسندگان
چکیده
منابع مشابه
Internal Motions of both Poly(N-isopropylacrylamide) Linear Chains and Spherical Microgel Particles in Water
Poly(N-isopropylacrylamide) (PNIPAM) linear chains and spherical microgel particles in very dilute aqueous solutions were studied by dynamic laser light scattering (LLS) over a wide range of scattering angles (6-154°). For the linear chains, at x < 1, only one peak related to diffusion was observed in the line-width distribution G(Γ), while for x > 1, we detected a second peak related to intern...
متن کاملthermal property and microstructures of poly(vac-b-ma) and pvac-b-poly(ma-co-mma) block copolymers and terpolymers
the microstructure and thermal properties of the synthesized block copolymers and terpolymers via atom transfer radical polymerization (atrp) were studied. the mole fraction of the blocks and chain length of the pvac-b-pma block copolymers were estimated with 1h nmr spectroscopy.differential scanning calorimety measurement shows two different transitions at 36°c and 8°c assigned to pvac and pma...
متن کاملSynthesis of micrometer-size poly(N-isopropylacrylamide) microgel particles with homogeneous crosslinker density and diameter control.
Poly(N-isopropylacrylamide) microgel particles are synthesized using a semi-batch surfactant-free emulsion polymerization method. Particle diameter can be precisely adjusted by controlling the initial conditions, the electrolyte concentration, and the monomer feeding rate and duration. Larger particles are obtained in the presence of small amounts of co-monomer with cationic amino groups that c...
متن کاملPreparation of monodisperse poly(N-isopropylacrylamide) microgel particles with homogenous cross-link density distribution.
Monodisperse microgel latex with homogeneous cross-link density distribution within the particles was prepared by feeding the monomer and cross-linker into the reaction mixture in a regulated way during the polymerization. To determine the appropriate monomer feeding parameters, the kinetics of the particle formation was investigated by HPLC. The swelling and optical characteristics of the prep...
متن کاملPoly (N-Isopropylacrylamide) Microgel-Based Etalons for Optical Sensing
Poly (N-isopropylacrylamide) (pNIPAm) is one of the most completely studied “smart” polymers due to its unique reversible thermoresponsivity.That is, when pNIPAm in water is heated > ~31°C, it transits from a random coil to a globule conformation; this transition is reversed when T < ~31°C. This conformational change is accompanied by water exchange process. When pNIPAm undergoes the coil to gl...
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ژورنال
عنوان ژورنال: Colloid and Polymer Science
سال: 2009
ISSN: 0303-402X,1435-1536
DOI: 10.1007/s00396-008-1984-x