Methyl methacrylate as solvent for the thermal decomposition of the cyclic molecule pinacolone diperoxide: Toward the polymerization process

2019 ◽  
Vol 57 (9) ◽  
pp. 997-1007
Author(s):  
Karla Delgado‐Rodríguez ◽  
Francisco J. Enríquez‐Medrano ◽  
Adriana Berenice Espinoza‐Martínez ◽  
Gastón P. Barreto ◽  
Gabriel Merino ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Methyl Methacrylate ◽  
Polymerization Process ◽  
Cyclic Molecule

Thermal decomposition of diethyl ketone triperoxide in methyl methacrylate: Theoretical and experimental study of the initial solvation state and its influence on the polymerization process

2015 ◽  
Vol 133 (4) ◽  
pp. n/a-n/a
Author(s):  
Karla Delgado Rodríguez ◽  
Francisco J. Enríquez-Medrano ◽  
Daniel Grande ◽  
Gastón P. Barreto ◽  
Adriana Cañizo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermal Decomposition ◽  
Methyl Methacrylate ◽  
Polymerization Process ◽  
Diethyl Ketone ◽  
Solvation State

scholarly journals Homogeneous Distribution of Polymerizable Coumarin Dyes for Active Few Mode POF

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1975
Author(s):  
Florian Jakobs ◽  
Kristoffer Harms ◽  
Jana Kielhorn ◽  
Daniel Zaremba ◽  
Pen Yiao Ang ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Optical Fibers ◽  
High Performance ◽  
Polymer Chains ◽  
Size Exclusion ◽  
Polymerization Process ◽  
Homogeneous Distribution ◽  
Exclusion Chromatography ◽  
Polymer Optical Fibers ◽  
Coumarin Dyes

For most kinds of active polymer optical fibers, a homogeneous distribution of dye molecules over the entire fiber length and cross section is required. In this study, chemical bonding of dyes to poly(methyl methacrylate) (PMMA) by copolymerization is achieved within the polymerization process instead of dissolving the dyes in the monomers. In combination with an improved fabrication mechanism, this leads to homogeneous dye distribution within the preforms. A method for proving the integration of the dyes into the polymer chains has been developed using high-performance liquid chromatography (HPLC) and size exclusion chromatography (SEC). Prestructured core-cladding preforms with dye-doped poly(cylohexyl methacrylate-co-methyl methacrylate)-core have been prepared with the Teflon string technique and were heat-drawn to few mode fibers.

Methyl methacrylate reactivity under electric field in view of an electrically induced polymerization process

2019 ◽  
Vol 723 ◽  
pp. 57-64
Author(s):  
Eduardo A. Soto-Bustamante ◽  
Sergio O. Vásquez ◽  
Patricio Romero-Hasler
Keyword(s):  
Electric Field ◽  
Methyl Methacrylate ◽  
Polymerization Process

Poly(methyl methacrylate)/Graphene Oxide Nanocomposites by a Precipitation Polymerization Process and Their Dielectric and Rheological Characterization

2014 ◽  
Vol 47 (6) ◽  
pp. 2149-2155 ◽  
Author(s):  
Jean-Michel Thomassin ◽  
Milana Trifkovic ◽  
Walid Alkarmo ◽  
Christophe Detrembleur ◽  
Christine Jérôme ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Methacrylate ◽  
Precipitation Polymerization ◽  
Polymerization Process ◽  
Rheological Characterization ◽  
Poly Methyl Methacrylate

Synthesis and thermal decomposition kinetics of poly(methyl methacrylate)-b-poly(styrene) block copolymers

2015 ◽  
Vol 30 (5) ◽  
pp. 691-706 ◽  
Author(s):  
Xinghua Guan ◽  
Xiaoyan Ma ◽  
Hualong Zhou ◽  
Fang Chen ◽  
Zhiguang Li
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Weight Loss ◽  
Block Copolymers ◽  
Methyl Methacrylate ◽  
Terminal Group ◽  
Loss Ratio ◽  
Poly Methyl Methacrylate ◽  
Second Stage ◽  
Weight Loss Ratio

Two diblock copolymers of poly(methyl methacrylate)- block-poly(styrene) with chlorine as terminal group (PMMA- b-PS-Cl) were synthesized via two-step atom transfer radical polymerization. The structures of the block copolymers were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, and gel permeation chromatography. Thermal properties including glass transition temperature ( Tg) and thermal stability were studied by differential scanning calorimetry and thermogravimetric analysis (TGA), respectively. The block copolymers of PMMA- b-PS-Cl exhibited two glass transitions, which were attributed to the Tgs of PMMA and PS segments, respectively. According to TGA, thermal decompositions of PMMA macro-initiator and PMMA- b-PS-Cl block copolymers had two stages. The weight loss ratio in the second stage was more significant than that in the first stage, which may be attributed to the separation of the halogen atom from the terminal group and the formation of a double bond. The breaking down of the backbone dominates in the second stage in which the weight loss ratio was more than 70%, represented the main stage of pyrolysis. It was found that the introduction of the PS chain remarkably enhanced the thermal stability of the copolymer, thus endowing the block copolymers high activation energy for thermal decomposition. On the other hand, the remaining two pyrolysis procedures further indicated that thermodynamic mechanism didn’t change due to the introduction of PS segments.

Syntheses of Ethyl Cellulose Acrylate Hybrid Latex via Mini-Polymerization

2011 ◽  
Vol 250-253 ◽  
pp. 804-808
Author(s):  
Ri Qing Chen ◽  
Fu Xiang Chu ◽  
Chun Peng Wang ◽  
Elodie Bourgeat-Lami ◽  
Muriel Lansalot
Keyword(s):  
Particle Size ◽  
Methyl Methacrylate ◽  
Butyl Acrylate ◽  
Ethyl Cellulose ◽  
Reaction System ◽  
Monomer Conversion ◽  
Polymerization Process ◽  
The Stability ◽  
Hybrid Latex ◽  
Monomer Droplet

Ethyl cellulose was hybridized with methyl methacrylate and butyl acrylate via mini-polymerization. The polymerization process was traced to obtain a stable reaction system. The effects of the EC content and viscosity on the monomer droplet size, the particle size and the monomer conversion were investigated. It was showed that the stability of the latex dispersion was strongly dependent of the EC content and viscosity. With investigation on ethyl cellulose series, initiator and crosslinker, the stable mini-emulsion with 10% ethyl cellulose was obtained under conditions of crosslinker and LPO as initiator.

Thermal decomposition study of poly(methyl methacrylate)/carbon nanofiller composites

2010 ◽  
Vol 22 (1) ◽  
pp. 84-89 ◽  
Author(s):  
A.O. Pozdnyakov ◽  
U.A. Handge ◽  
A. Konchits ◽  
V. Altstädt
Keyword(s):  
Thermal Decomposition ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Carbon Nanofiller

scholarly journals Flexural strength and modulus of autopolimerized poly (methyl methacrylate) with nanosilica

2018 ◽  
Vol 75 (6) ◽  
pp. 564-569 ◽  
Author(s):  
Sebastian Balos ◽  
Branka Pilic ◽  
Djordje Petrovic ◽  
Branislava Petronijevic ◽  
Ivan Sarcev
Keyword(s):  
Mechanical Properties ◽  
Zeta Potential ◽  
Methyl Methacrylate ◽  
Flexural Modulus ◽  
Energy Dispersive ◽  
Polymerization Process ◽  
Liquid Component ◽  
Potential Measurement ◽  
X Ray ◽  
Poly Methyl Methacrylate

Background/Aim. Autopolymerized, or cold polymerized poly(methyl methacrylate) class of materials have a lower mechanical properties compared to hot polymerized poly(methyl methacrylate), due to a limited time of mixing before the polymerization process begins. The aim of this study was to test the effect of different relatively low nanosilica contents, in improving mechanical properties of the cold polymerized poly(methyl methacrylate). Methods. A commercially available autopolymerized poly(methyl methacrylate) denture reline resin methyl methacrylate liquid component was mixed with 7 nm after treated hydrophobic fumed silica and subsequently mixed with poly(methyl methacrylate) powder. Three nanosilica loadings were used: 0.05%, 0.2% and 1.5%. Flexural modulus and strength were tested, with one way ANOVA followed by Tukey?s test. Furthermore, zeta potential, differential scanning calorimetry, scaning electrone microscopy and energy dispersive X-ray analyses were performed. Results. Flexural modulus and strength of poly(methyl methacrylate) based nanocomposites were statistically significantly increased by the addition of 0.05% nano-SiO2. The increase in nanosilica content up to 1.5% does not contribute to mechanical properties tested, but quite contrary. The main reason was agglomeration, that occurred before mixing of the liquid and powder component and was proved by zeta potential measurement, and after mixing, proved by scanning electrone microscopy and energy dispersive x-ray analyses. Conclusions. Addition of 7 nm 0.05% SiO2 is the most effective in increasing flexural modulus and strength of autopolimerized poly(methyl methacrylate).

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