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Synthesis and characterization of Poly(N-isopropylacrylamide)/Poly(acrylic acid) semi-IPN nanocomposite microgels.

Abstract

A novel pH- and temperature-sensitive nanocomposite microgel based on linear Poly(acrylic acid) (PAAc) and Poly(N-isopropylacrylamide) (PNIPA) crosslinked by inorganic clay was synthesized by a two-step method. First, PNIPA microgel was prepared via surfactant-free emulsion polymerization by using inorganic clay as a crosslinker, and then AAc monomer was polymerized within the PNIPA microgel. The structure and morphology of the microgel were confirmed by FTIR, WXRD and TEM. The results indicated that the exfoliated clay platelets were dispersed homogeneously in the PNIPA microgels and acted as a multifunctional crosslinker, while the linear PAAc polymer chains incorporated in the PNIPA microgel network to form a semi-interpenetrating polymer network (semi-IPN) structure. The hydrodynamic diameters of the semi-IPN microgels ranged from 360 to 400 nm, which was much smaller than that of the conventional microgel prepared by using N,N'-methylenebis(acrylamide) (MBA) as a chemical crosslinker, the later was about 740 nm. The semi-IPN microgels exhibited good pH- and temperature-sensitivity, which could respond independently to both pH and temperature changes.

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  • Authors+Show Affiliations

    ,

    State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Dong Hua University, Shanghai 200051, People's Republic of China. mjh68@dhu.edu.cn

    , ,

    Source

    Journal of colloid and interface science 341:1 2010 Jan 01 pg 88-93

    MeSH

    Acrylamides
    Acrylic Resins
    Gels
    Hydrogen-Ion Concentration
    Nanotechnology
    Temperature

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    19822320

    Citation

    TY - JOUR T1 - Synthesis and characterization of Poly(N-isopropylacrylamide)/Poly(acrylic acid) semi-IPN nanocomposite microgels. AU - Ma,Jinghong, AU - Fan,Bing, AU - Liang,Borun, AU - Xu,Jian, Y1 - 2009/09/20/ PY - 2009/06/06/received PY - 2009/09/14/revised PY - 2009/09/14/accepted PY - 2009/10/14/entrez PY - 2009/10/14/pubmed PY - 2010/2/25/medline SP - 88 EP - 93 JF - Journal of colloid and interface science JO - J Colloid Interface Sci VL - 341 IS - 1 N2 - A novel pH- and temperature-sensitive nanocomposite microgel based on linear Poly(acrylic acid) (PAAc) and Poly(N-isopropylacrylamide) (PNIPA) crosslinked by inorganic clay was synthesized by a two-step method. First, PNIPA microgel was prepared via surfactant-free emulsion polymerization by using inorganic clay as a crosslinker, and then AAc monomer was polymerized within the PNIPA microgel. The structure and morphology of the microgel were confirmed by FTIR, WXRD and TEM. The results indicated that the exfoliated clay platelets were dispersed homogeneously in the PNIPA microgels and acted as a multifunctional crosslinker, while the linear PAAc polymer chains incorporated in the PNIPA microgel network to form a semi-interpenetrating polymer network (semi-IPN) structure. The hydrodynamic diameters of the semi-IPN microgels ranged from 360 to 400 nm, which was much smaller than that of the conventional microgel prepared by using N,N'-methylenebis(acrylamide) (MBA) as a chemical crosslinker, the later was about 740 nm. The semi-IPN microgels exhibited good pH- and temperature-sensitivity, which could respond independently to both pH and temperature changes. SN - 1095-7103 UR - https://www.unboundmedicine.com/medline/citation/19822320/Synthesis_and_characterization_of_Poly_N_isopropylacrylamide_/Poly_acrylic_acid__semi_IPN_nanocomposite_microgels_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9797(09)01207-7 ER -