Preparation and characterization of UV‐curable MPS‐modified silica nanocomposite coats

Li, Fusheng; Zhou, Shuxue; Wu, Limin

doi:10.1002/app.22143

Cited by 36 publications

(13 citation statements)

References 26 publications

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“…So there is better interfacial interaction in hybrid film with 10-nm silica particles based on the strong interaction with carbonyl groups of polyimide chains through hydrogen bonding. 21,22 This result favors the improvement of properties of hybrids.…”

Section: Microstructure Of Hybrid Filmssupporting

confidence: 50%

Synthesis and properties of silica–polyimide hybrid films derived from colloidal silica particles and polyamic acid

Shang

Lü

et al. 2008

J of Applied Polymer Sci

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A series of SiO 2 /polyimide hybrid films with different contents and sizes of SiO 2 particles were prepared by blending polyamic acid (PAA) and SiO 2 nanoparticles obtained from Stö ber method, followed by a step thermal imidization process. The size and content effect of SiO 2 particles on the mechanical and thermal properties was studied. It was found that as the silica particles were introduced into polyimide matrix, T g s of hybrid films increased on the whole and there was a maximum value of T g for the hybrid film with 10-nm SiO 2 particles. TGA indicated that the thermal stability for hybrid films decreased with the increasing content and size of SiO 2 particles. Dynamic mechanical thermal analysis (DMTA) indicated that the modulus of hybrid films increased, while the tensile strength and elongation at break decreased as the size of SiO 2 particles increases from 10 to 25 nm and to 65 nm. All polyimide hybrid films were amorphous according to X-ray determination.

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Section: Microstructure Of Hybrid Filmssupporting

confidence: 50%

Synthesis and properties of silica–polyimide hybrid films derived from colloidal silica particles and polyamic acid

Shang

Lü

et al. 2008

J of Applied Polymer Sci

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“…Although, there is no obvious reasons to justify such a phenomenon, nanoparticles could be assumed as impurities in polymerization media. A significant decrease in Mn of LMMS492 with respect to LMMS472 can be attributed to the formation of 3D networks composed of silica nanoparticles [30] which are bonded together covalently. These 3D networks reduce the mobility of free radicals and cause a decrease in conversion and molecular weight.…”

Section: Conversion and Molecular Weightmentioning

confidence: 97%

A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization

et al. 2012

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A number of batch polymerizations were performed to study the effect of pristine nanoparticle loading on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization. In order to improve the dispersion of silica nanoparticles in PMMA matrix, the silanol groups of the silica are functionalized with methyl methacrylate groups and modified nanoparticles were used to synthesize PMMA/modified silica nanocomposites via RAFT polymerization. Prepared samples were characterized by thermogravimetric analysis (TGA), dynamic light scattering (DLS), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). According to results, introduction of modified nanoparticles results in better thermal and mechanical properties than those of pristine nanoparticles. Also, surface modification and increasing silica nanoparticles result in variation of thermal degradation behavior of nanocomposites. The best improvement of mechanical and thermophysical properties is achieved for nanocomposites containing 7 wt. % silica nanoparticles.

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“…[22] In other studies, silica nanoparticles have resulted in an increase the rate of polymerization which has been attributed to changes in propagation and termination rate constants. [23][24][25] Also, modified nanoparticles as multifunctional sites form a three-dimensional network which leads to reduction in the mobility of chains and thus slow down the rate of polymerization. [24][25] Due to the formation of aggregates, greater particle size leads to higher rate of reaction, which is mainly because of high medium viscosity and the occurrence of auto-acceleration phenomenon.…”

Section: Polymerization Kineticsmentioning

confidence: 99%

“…[23][24][25] Also, modified nanoparticles as multifunctional sites form a three-dimensional network which leads to reduction in the mobility of chains and thus slow down the rate of polymerization. [24][25] Due to the formation of aggregates, greater particle size leads to higher rate of reaction, which is mainly because of high medium viscosity and the occurrence of auto-acceleration phenomenon. [24][25] On the other hand, in some studies, an optimum loading of silica nanoparticles has been reported in which the polymerization rate reaches the maximum value.…”

Section: Polymerization Kineticsmentioning

confidence: 99%

“…[24][25] Due to the formation of aggregates, greater particle size leads to higher rate of reaction, which is mainly because of high medium viscosity and the occurrence of auto-acceleration phenomenon. [24][25] On the other hand, in some studies, an optimum loading of silica nanoparticles has been reported in which the polymerization rate reaches the maximum value. [26][27][28][29] In these studies, silica nanoparticles can improve the mobility and diffusion of propagating radicals, which lead to increase in the rate of polymerization.…”

Section: Polymerization Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

A kinetics study on thein situreversible addition–fragmentation chain transfer and free radical polymerization of styrene in presence of silica aerogel nanoporous particles

Sobani

Haddadi‐Asl

Mirshafiei-Langari

et al. 2013

Designed Monomers and Polymers

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Nanoporous silica aerogel particles were synthesized via sol-gel process and modified with a hydrophobic surfactant. Batch polymerizations of styrene in presence of silica aerogel particles were studied via free radical and reversible addition-fragmentation chain transfer (RAFT) polymerizations. Monomer conversion, molecular weight, and polydispersity index of each system were monitored during polymerization to investigate the reaction kinetics. According to results, in both systems, the presence of silica aerogel particles has a sensible influence on polymerization kinetic and adding aerogels results in decreased polymerization rate, conversion, and molecular weight. Moreover, the prepared samples were characterized by Fourier transform infrared spectroscopy. Also, thermal gravimetric analysis (TGA) and differential scanning calorimetric techniques was used to observe the effect of aerogel particles on thermal properties of synthesized nanocomposites. According to TGA depiction, in free radical samples, one-stage degradation, related to random chain scission, is observed while degradation of RAFT-prepared nanocomposites occurred in two steps due to the decomposition of RAFT moieties and random chain scission.

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Preparation and characterization of UV‐curable MPS‐modified silica nanocomposite coats

Cited by 36 publications

References 26 publications

Synthesis and properties of silica–polyimide hybrid films derived from colloidal silica particles and polyamic acid

Synthesis and properties of silica–polyimide hybrid films derived from colloidal silica particles and polyamic acid

A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization

A kinetics study on thein situreversible addition–fragmentation chain transfer and free radical polymerization of styrene in presence of silica aerogel nanoporous particles

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