Formation of chemically bound polymer layers on oxide surfaces and their role in colloidal stability

Laible, Richard; Hamann, K.

doi:10.1016/0001-8686(80)87002-3

Cited by 160 publications

(76 citation statements)

References 34 publications

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“…The surface grafting of polymer onto inorganic fillers is known to be very effective to improve the dispersibility in polymer matrices [22]. TEM was used to examine the quality of the dispersion of silica in PBT.…”

Section: Microstructure and Morphologymentioning

confidence: 99%

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Yao

Tian

Zhang

et al. 2009

Polymer Engineering & Sci

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In this study, we presented a convenient, in situ polymerization route for the preparation of Poly (butylene terephthalate) (PBT)/silica nanocomposites, in which silica was not premodified. The nanocomposites were synthesized by in situ polymerization of terephthalic acid (TPA), 1,4-butanediol (BD) and silica. The structure of these nanocomposites were investigated by Fourier transform infrared (FTIR) and thermogravimetric analyses (TGA). The results show that PBT chains were successfully grafted onto the surface of silica. Transmission electron microscope (TEM) micrographs revealed that silica were homogeneously dispersed in PBT matrix at a size level of 10-20 nm. The isothermal crystallization kinetics of pure PBT and PBT/silica nanocomposites were investigated by differential scanning calorimeter (DSC) and simulated by Avrami model. The existence of silica could lead to an acceleration of crystallization and enhance the thermal stability of PBT. According to dynamic mechanical analysis (DMA), the storage modulus of PBT/silica nanocomposites were markedly improved compared with pure PBT.

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Section: Microstructure and Morphologymentioning

confidence: 99%

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Yao

Tian

Zhang

et al. 2009

Polymer Engineering & Sci

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“…Monomer sticking free energies, ǫ, have values typical of covalent bonds which are one to two orders of magnitude greater than kT . Chemical adsorption is employed in various technologies where polymers are attached by chemical reactions to solid surfaces either from a polymer melt as in the reinforcement of polymer-polymer or polymer-solid interfaces [2,6,11,12], or from solution as in colloid stabilization by chemically grafting polymers onto particle surfaces [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium in adsorbed polymer layers

O’Shaughnessy

Vavylonis

2005

J. Phys.: Condens. Matter

123

152

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Abstract.High molecular weight polymer solutions have a powerful tendency to deposit adsorbed layers when exposed to even mildly attractive surfaces. The equilibrium properties of these dense interfacial layers have been extensively studied theoretically. A large body of experimental evidence, however, indicates that non-equilibrium effects are dominant whenever monomer-surface sticking energies are somewhat larger than kT , a common case. Polymer relaxation kinetics within the layer are then severely retarded, leading to non-equilibrium layers whose structure and dynamics depend on adsorption kinetics and layer ageing. Here we review experimental and theoretical work exploring these non-equilibrium effects, with emphasis on recent developments. The discussion addresses the structure and dynamics in non-equilibrium polymer layers adsorbed from dilute polymer solutions and from polymer melts and more concentrated solutions. Two distinct classes of behaviour arise, depending on whether physisorption or chemisorption is involved. A given adsorbed chain belonging to the layer has a certain fraction of its monomers bound to the surface, f , and the remainder belonging to loops making bulk excursions. A natural classification scheme for layers adsorbed from solution is the distribution of single chain f values, P (f ), which may hold the key to quantifying the degree of irreversibility in adsorbed polymer layers. Here we calculate P (f ) for equilibrium layers; we find its form is very different to the theoretical P (f ) for non-equilibrium layers which are predicted to have infinitely many statistical classes of chain. Experimental measurements of P (f ) are compared to these theoretical predictions.

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“…Surface modifications of inorganic particles have been widely studied [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Surface graft polymerization is one of the most effective and versatile methods used in making many of these modifications.…”

Section: Introductionmentioning

confidence: 99%

Structural estimation of particle arrays at air–water interface based on silica particles with well‐defined and highly grafted poly(methyl methacrylate)

Moon

Kim

Paik

et al. 2009

Polymer Engineering & Sci

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Silica nanoparticles with well-defined, highly grafted dense poly(methyl methacrylate) (MMA) were prepared by surface-initiated activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP) of methyl methacrylate with an initiatorfixed silica particle in the presence of air. Two different polymerizations of MMA were carried out under the same conditions using tris[2-(dimethylamino)ethyl]-amine (Me 6 TREN) and N,N,N 0 ,N 0 ,N 00 -pentamethyldiethylene-triamine (PMDETA) as the ligand, respectively. In the CuCl 2 /PMDETA system, polymerization appeared to be more controlled with a lower polydisperisty compared with the CuCl 2 /Me 6 TREN system. The monolayer of these particles was formed at the air-water interface using Langmuir-Blodgett (LB) technique. Multilayers of the particles were fabricated by repetition of LB depositing. A surface pressure-area (p-A) measurement and SEM observation were used to characterize the particle arrays.

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Formation of chemically bound polymer layers on oxide surfaces and their role in colloidal stability

Cited by 160 publications

References 34 publications

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Preparation and characterization of poly(butylene terephthalate)/silica nanocomposites

Non-equilibrium in adsorbed polymer layers

Structural estimation of particle arrays at air–water interface based on silica particles with well‐defined and highly grafted poly(methyl methacrylate)

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