Complexes in polymers: FT-IR spectra and photochemistry of some monomeric organometallic carbonyl complexes in polystyrene, poly(methyl methacrylate), polystyrene?poly(methyl methacrylate) and polystyrene?polyacrylonitrile copolymers

1987 ◽  
Vol 1 (5) ◽  
pp. 383-392 ◽  
Author(s):  
Alan Shaver ◽  
Ian S. Butler ◽  
Adi Eisenberg ◽  
Jian Ping Gao ◽  
Zhen H Xu ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Ir Spectra ◽  
Carbonyl Complexes ◽  
Poly Methyl Methacrylate ◽  
Ft Ir

Preparation and Thermal Performance of Poly(Methyl Methacrylate)/Binary Alkane-Alcohol Organic Eutectic Microcapsules as Phase Change Materials for Cold Storage

2016 ◽  
Vol 852 ◽  
pp. 614-617
Author(s):  
Ni Gao ◽  
Li Xian Sun ◽  
Fen Xu ◽  
Huan Zhi Zhang ◽  
Zhong Cao
Keyword(s):  
Methyl Methacrylate ◽  
Phase Change ◽  
Phase Change Materials ◽  
Spherical Shape ◽  
Polymerization Reaction ◽  
Poly Methyl Methacrylate ◽  
Organic Eutectic ◽  
Heat Value ◽  
Ft Ir ◽  
Thermal Stability Of

In this study, the microcapsules containing binary alkane-alcohol organic eutectic of mixed n-tetradecane and 1-dodecanol (TD-DD) phase change materials as the core and poly (methyl methacrylate)(PMMA) as the shell were prepared by emulsion polymerization reaction. The microcapsules were characterized by using DSC, SEM, FT-IR and TG. The results of DSC test showed that melting and freezing temperatures of the microcapsules are-6.136 °C and 5.203 °C, and total latent heat value are-82.522 J/g and 77.632 J/g, respectively. The SEM and FT-IR analyses indicated that PMMA shell has successfully encapsulated TD-DD. The TD-DD and the microcapsules exhibited in spherical shape. Additionally, the TG test showed that the thermal stability of TD-DD was increased after encapsulation.

Synthesis and Characterization of Poly(Methyl Methacrylate) -Grafted-Cellulose Nanofiber

2013 ◽  
Vol 423-426 ◽  
pp. 159-162
Author(s):  
Chun Wang ◽  
Qing Li ◽  
Jian Hua Yang ◽  
Jun Ya Wada ◽  
Takahiko Kawai ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Thermal Analyses ◽  
Cellulose Nanofibers ◽  
Gel Permeation Chromatography ◽  
Hydrolysis Time ◽  
Poly Methyl Methacrylate ◽  
Hydrolysis Method ◽  
Ft Ir ◽  
Azo Initiator

Poly (methyl methacrylate) (PMMA)-graft-cellulose nanofibers (CeNFs) (PMMA-g-CeNF) were synthesized by means of graft-polymerization using Azo initiator in aqueous medium. The synthesized grafted fibers were characterized by Fourier transform infrared spectroscopy (FT-IR). Then, PMMA-g-CeNF were hydrolyzed by acid hydrolysis method with different acid constant and hydrolysis time and characterized by gel permeation chromatography (GPC). Finally, PMMA-g-CeNF was characterized by thermo-gravimetric and differential thermal analyses (TG-DTA).

scholarly journals In Situ Synthesis of Poly(methyl methacrylate)/SiO2Hybrid Nanocomposites via “Grafting Onto” Strategy Based on UV Irradiation in the Presence of Iron Aqueous Solution

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Hong Zhang ◽  
Chao Li ◽  
Jinshan Guo ◽  
Limin Zang ◽  
Jiahe Luo
Keyword(s):  
Aqueous Solution ◽  
Methyl Methacrylate ◽  
Uv Irradiation ◽  
Hybrid Composites ◽  
Monomer Conversion ◽  
Hybrid Particles ◽  
Poly Methyl Methacrylate ◽  
Ft Ir ◽  
Grafting Onto

Poly(methyl methacrylate)/SiO2(PMMA/SiO2) hybrid composites were prepared via “grafting onto” strategy based on UV irradiation in the presence of iron aqueous solution. Two steps were used to graft polymethyl methacrylate (PMMA) onto the surface of nanosilica, anchoring 3-(methacryloxy) propyl trimethoxysilane (MPTS) onto the surface of nanosilica to modify it with double bonds, and then grafting PMMA onto the surface of nanosilica with FeCl3as photoinitiator. The products were characterized by FT-IR, TGA, TEM, DLS, and XPS. The results showed that it is easy to graft PMMA onto the surface of nanosilica under UV irradiation, and the hybrid particles are monodisperse and have core-shell structure with nanosilica as the core and PMMA layers as the shell. Furthermore, the products initiated by FeCl3have higher monomer conversion, percent grafting, and better monodispersion compared with the products initiated by traditional photoinitiator such as 2-hydroxy-4-(2-hydroxyethoxy)-2-methyl-propiophenone (Irgacure 2959).

scholarly journals PREPARATION AND CHARACTERIZATION OF SIO2/POLY(METHYL METHACRYLATE) CORE/SHELL NANOCOMPOSITES VIA RAFT POLYMERIZATION

2018 ◽  
Vol 54 (1A) ◽  
pp. 285
Author(s):  
Long Giang Bach
Keyword(s):  
Methyl Methacrylate ◽  
Photoelectron Spectroscopy ◽  
Raft Polymerization ◽  
Simple Procedure ◽  
Sio2 Nanoparticles ◽  
Core Shell ◽  
Poly Methyl Methacrylate ◽  
Reversible Addition ◽  
Ft Ir ◽  
Grafting From

This article describes the fabrication of SiO2 nanoparticles grafted with poly(methyl methacrylate) (PMMA) via a fascinating reversible addition-fragmentation chain transfer (RAFT) polymerization by adopting “grafting from” approach. The silane coupling agent, S-benzyl S’-trimethoxysilylpropyltrithiocarbonate, was anchored onto SiO2 nanoparticles in a simple procedure using a ligand exchange reaction. RAFT agents-anchored SiO2 nanoparticles were then used for the surface-initiated RAFT polymerization of MMA to fabricate structurally well-defined, core-shell SiO2-g-PMMA nanocomposites. The structure and properties of the as-synthesized nanocomposites were investigated by Fourier Transformed Infrared Spectrophotometry (FT-IR), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric analysis (TGA), Field Emission Scanning Electron Microscopy (FE-SEM).

Transparent Poly(methyl methacrylate)/TiO2 Nanocomposites for UV-Shielding Applications

2011 ◽  
Vol 239-242 ◽  
pp. 1129-1136 ◽  
Author(s):  
Xiang Fu Meng ◽  
Zhi Wei Zhang ◽  
Nan Luo
Keyword(s):  
Methyl Methacrylate ◽  
Sol Gel ◽  
Titania Nanoparticles ◽  
Tetrabutyl Titanate ◽  
Poly Methyl Methacrylate ◽  
Uv Shielding ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Hydrolysis Of

Transparent poly(methyl methacrylate) (PMMA)/TiO2 nanocomposites have been prepared by solution mixing PMMA with organically soluble titania xerogel. The organically soluble titania xerogel in the form of amorphous phase has been synthesized via a simple sol-gel method, involving hydrolysis of tetrabutyl titanate (TBT) in trifluoroacetic acid (TFA) and gelation. The obtained PMMA/TiO2 nanocomposites were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), thermogravimetry (TG) and ultraviolet-visible (UV-vis) absorption spectroscopy. The results showed that the interaction between titania nanoparticles and PMMA macromolecular chains led to a homogeneous dispersion of TiO2 in PMMA matrix. The resulting PMMA/TiO2 nanocomposites showed improved thermal stability, high transparency and high UV-shielding efficiency with a small amount of titania xerogel (£3.0 wt%). The present work is of interest for developing a series of transparent UV-shielding nanocomposites.

Polarized FT-IR Spectra of Transition Metal Carbonyl Complexes Oriented in Nematic Liquid Crystal Solvents

1988 ◽  
Vol 42 (3) ◽  
pp. 497-503 ◽  
Author(s):  
Ian S. Butler ◽  
Jacqueline Sedman
Keyword(s):  
Liquid Crystal ◽  
Ir Spectra ◽  
Nematic Liquid Crystal ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
Vibrational Assignments ◽  
Metal Carbonyl Complexes ◽  
Ft Ir ◽  
Metal Hexacarbonyls ◽  
Bending Modes

The polarized FT-IR spectra of Mn2(CO)10, M(CO)6 (M = Cr, W), and CpM′(CO)3 (Cp = η5-C5H5; M′ = Mn, Re) dissolved in a nematic liquid crystal solvent (Merck 1132 TNC) have been recorded at room temperature. Definitive vibrational assignments have been made for the CO stretching modes of the complexes on the basis of their observed polarization behavior. For Mn2(CO)10, assignments are also proposed for MnCO bending modes. The group VIB metal hexacarbonyls are shown to be tetragonally distorted in Merck 1132 TNC. Dichroic spectra were obtained for the CO stretching modes of the CpM′(CO)3 complexes with the use of both Merck 1132 TNC and Kodak X11643 liquid crystal solvents. The complexes orient perpendicularly to the long axes of the components of the Merck liquid crystal and parallel to those of the Kodak one. The dichroic spectra show that the known distortions of the Cp′ rings in these complexes are apparently accompanied by deformation of the M′(CO)3 moieties.

Visualization of poly(methyl methacrylate) (PMMA) grafts on cellulose via high-resolution FT-IR microscopy imaging

2012 ◽  
Vol 3 (2) ◽  
pp. 307-309 ◽  
Author(s):  
Susanne Hansson ◽  
Thomas Tischer ◽  
Anja S. Goldmann ◽  
Anna Carlmark ◽  
Christopher Barner-Kowollik ◽  
...  
Keyword(s):  
High Resolution ◽  
Methyl Methacrylate ◽  
Microscopy Imaging ◽  
Poly Methyl Methacrylate ◽  
Ir Microscopy ◽  
Ft Ir
Sign in / Sign up

Export Citation Format

Share Document