Comb−Coil Polymer Brushes on the Surface of Silica Nanoparticles

Zhao, Hanying; Kang, Xiaoli; Liu, Li

doi:10.1021/ma051822p

Cited by 75 publications

(73 citation statements)

References 23 publications

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“…In the following description, these cellulose derivatives acted as initiators of ROP as well as initiators of ATRP. The reaction conditions and results were summarized in Table III. At first, the AGET ATRPs of EMO and MMA and the ROPs of CL and LLA in the same reaction system simultaneously [31][32][33][34][35] by using the same initiator of Cell-ClAc were performed respectively (Scheme 4, run1-4 in Table III). Sn(Oct) 2 was used as reducing agent for Cu(II), and in the meantime, it was also used as catalyst for the ROPs of CEs.…”

Section: Resultsmentioning

confidence: 99%

Modification of Cellulose by Using Atom Transfer Radical Polymerization and Ring-Opening Polymerization

Chang

Yamabuki

Onimura

et al. 2008

Polym J

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The cellulose chloroacetate (Cell-ClAc) with a degree of substitution (DS) value of about 2.1 was synthesized through acylation reaction of microcrystalline cellulose in a homogeneous solution of dimethylacetamide/lithium chloride (DMAc/ LiCl), and pyridine as the acid acceptor. Atom transfer radical polymerizations (ATRP) of 3-ethyl-3-methacryloyloxymethyloxetane (EMO) and methyl methacrylate (MMA) were carried out by using Cell-ClAc as the initiator. Furthermore, the second ATRP reactions of MMA and EMO by using the products of Cell-PEMO and Cell-PMMA as initiators were performed, respectively. It was based on the consideration of that the terminal halogens of Cell-PEMO or Cell-PMMA possess activity even after a long time period and could be used as initiator for another ATRP reaction. Different reactions including the activators generated by electron transfer (AGET) ATRP of EMO or MMA and the Ring-Opening Polymerization (ROP) of aliphatic cyclic ester (CE) ("-caprolactone (CL), or L-Lactide (LLA)) proceed in a same reaction system simultaneously by using the same initiator of Cell-ClAc or Cell-PEMO or Cell-PMMA were also carried out. For analyses of products, the measurements of FT-IR, DSC, TG-DTA, WAXD were performed, and a Polarizing Microscope (POM) was also used for crystal observation of the products. All the measurement results proved the proceeding of the reactions.KEY WORDS: Microcrystalline Cellulose / Modification / ATRP / the Second ATRP / AGET ATRP / ROP / Along with the increasingly rising awareness of environmental protection and of utilizing petroleum resources more rationally and economically, more and more researchers turn the study direction from petroleum to natural and renewable resources such as the developments of biodegradable plastics and green sustainable plastics. Among the natural renewable resources, cellulose is one of the most popular materials because cellulose is the most abundant natural polymer on earth and possesses many potential outstanding properties and attractive advantages for applications, such as, high modulus of crystalline cellulose combined with the low weight, 1 not expensive, good biodegradability and renewability. However, the unmodified cellulose is not used for applications because it couldn't be dissolved in most conventional solvents and has not a melting temperature (T m ). Therefore, the modification of cellulose is required for its applications.

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Section: Resultsmentioning

confidence: 99%

Modification of Cellulose by Using Atom Transfer Radical Polymerization and Ring-Opening Polymerization

Chang

Yamabuki

Onimura

et al. 2008

Polym J

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“…The 1 H NMR and 19 F NMR spectroscopy results provided direct evidence to the cleavage of C-F bond and grafting of DMAEMA monomer from the secondary -CF 2 -groups of PVDF main chains (55). Another ATRP technique using activators generated by electron transfer (AGET-ATRP), with the combined advantages of normal ATRP and reversed ATRP, has also been developed (56)- (60). The AGET-ATRP technique has been successfully applied to modify different substrates.…”

Section: Scheme 4 Schematic Illustration Of the Formation Of A Poroumentioning

confidence: 99%

Surface-Functionalized and Surface-Functionalizable Poly(vinylidene fluoride) Membranes via Controlled/Living Radical Polymerization and Click Chemistry

Cai

Neoh

Kang

2012

ACS Symposium Series

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sg.Preparation of multifunctional and well-structured polymer substrates (membranes) requires a selection of the most suitable controlled/living radical polymerization (CRP) techniques in combination with appropriate click reactions. This article describes some recent research activities on poly(vinylidene fluoride) (PVDF) copolymer membranes.The synthesis strategies of PVDF membranes with functionalized and functionalizable surfaces via CRP techniques and click chemistry are described in detail. The robust and versatile CRP techniques and click chemistry have allowed the design and production of copolymers of well-defined architectures, such as telechelic, block and graft copolymers, via the "grafting from" and "grafting to" approaches. These technologies are particularly suited for the preparation of functional polymer membranes with stimuli-responsive, antifouling, antimicrobial and ion exchange surface properties. The combination of CRP techniques and click chemistry can be regarded as a revolutionary approach to the preparation of a new generation of precisely tailored specialty PVDF and related copolymer membranes.

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“…Recently, the developments in living radical polymerization techniques such as atom transfer radical polymerization (ATRP) [19], nitroxide-mediated polymerization (NMP) [20], and reversible addition-fragmentation transfer polymerization (RAFT) [21] have been applied in the surface modification of the nanoparticles. ATRP is a versatile technique for the controlled polymerization of wide variety of functional monomers, and can be used to synthesis block copolymers since the end groups remain active at the end of the polymerization [22].…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(methyl methacrylate) grafted hydroxyapatite nanoparticles via reverse ATRP

Wang¹,

Xiao²,

Huang³

et al. 2011

Journal of Colloid and Interface Science

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Comb−Coil Polymer Brushes on the Surface of Silica Nanoparticles

Cited by 75 publications

References 23 publications

Modification of Cellulose by Using Atom Transfer Radical Polymerization and Ring-Opening Polymerization

Modification of Cellulose by Using Atom Transfer Radical Polymerization and Ring-Opening Polymerization

Surface-Functionalized and Surface-Functionalizable Poly(vinylidene fluoride) Membranes via Controlled/Living Radical Polymerization and Click Chemistry

Preparation of poly(methyl methacrylate) grafted hydroxyapatite nanoparticles via reverse ATRP

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