scholarly journals Study of the features of suspension polymerization of methyl methacrylate in the presence of polymeric surfactants

2019 ◽  
pp. 23-25
Author(s):  
E. S. Kluzhin ◽  
A. A. Kholodova ◽  
O. A. Satkevich ◽  
I. A. Grizkova
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Sulfonic Acid ◽  
Suspension Polymerization ◽  
Average Molecular Weight ◽  
Polymeric Surfactants ◽  
Molecular Weight Characteristics ◽  
Acid Sodium Salt ◽  
Methacrylate Copolymer ◽  
Sulfonic Acid Sodium Salt

The molecular weight characteristics of the polymer obtained by suspension polymerization of methyl methacrylate in the presence of polymeric surfactants - (co)polymers of 2-acrylamido-2-methylpropane sulfonic acid, sodium salt of methyl methacrylate copolymer with methacrylic acid and acrylamide copolymer with acrylonitrile and acrylic acid are studied. It was found that the highly dispersed fraction (0.5–2 μm) of polymethyl methacrylate has an increased molecular weight and even at a content less than 1% has a noticeable eff ect on the average molecular weight. It is shown that an eff ective way to reduce the content of polymer particles 0.5–2 μm is the use of a dispersant, in which the colloidal solubility of methyl methacrylate is minimal.

Expansion characteristics of expandable styrene/methyl methacrylate copolymer particles: The effects of copolymer molecular weight and particle size

2016 ◽  
Vol 54 (2) ◽  
pp. 283-308 ◽  
Author(s):  
Ehsan Mehravar ◽  
Farhang Abbasi ◽  
Kiyumars Jalili ◽  
Hadi Rostami ◽  
Mostafa Rezaei
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Methyl Methacrylate ◽  
Dimensional Stability ◽  
Suspension Polymerization ◽  
Average Molecular Weight ◽  
Blowing Agent ◽  
Expansion Behavior ◽  
The Matrix ◽  
Methacrylate Copolymer

Spherical foamable particles were synthesized by suspension polymerization of methyl methacrylate and styrene in the presence of a blowing agent. When the surrounding temperature was high enough to vaporize the blowing agent and soften the polymer shell, the particles were expanded due to pressure difference across the shell. The effects of initiator and crosslinker concentration on the particle size, average molecular weight, and molecular weight distribution of synthesized copolymer, pentane content and expansion properties (density, residual pentane, and dimensional stability of pre-expanded beads) of expandable particles were investigated. The results showed that the expansion behavior of the particles was dependent on molecular weight of the matrix polymer and size of the synthesized particles. In a constant copolymer molecular weight, the pre-expanded bead density decreased with increasing of particle size whereas it increased with molecular weight in a constant particle size. Moreover, the crosslinker improved dimensional stability of the pre-expanded beads.

Influence of morin-5’-sulfonic acid sodium salt (NaMSA) on cyclophosphamide-induced changes in oxido-redox status in rat liver

2010 ◽  
Vol 62 ◽  
pp. 88-89
Author(s):  
Anna Merwid-Ląd ◽  
Małgorzata Trocha ◽  
Tomasz Sozański ◽  
Jan Magdalan ◽  
Ewa Chlebda ◽  
...  
Keyword(s):  
Rat Liver ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Redox Status ◽  
Acid Sodium Salt ◽  
Induced Changes ◽  
Sulfonic Acid Sodium Salt

Synthesis of 2-Hydroxyl-3-Sulfonic Acid Sodium Salt-Propyl Lacrylate

2012 ◽  
Vol 512-515 ◽  
pp. 2262-2266
Author(s):  
Rong Ming Zhang ◽  
Yue Wang ◽  
Wei Li ◽  
Hong Man Shan
Keyword(s):  
Surface Tension ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Synthesis Method ◽  
Influence Factors ◽  
Synthesis Process ◽  
Step Process ◽  
Tension Tests ◽  
Acid Sodium Salt ◽  
Sulfonic Acid Sodium Salt

2-hydroxyl-3-sulfonic acid sodium salt-propyl lacrylate was synthesized through the three-step process (sulfonation, ring-closing reaction, and esterification) by using epichlorohydrin as the starting material. The structure of oxiranemethane sulfonic acid sodium salt and end product 2-hydroxyl-3-sulfonic acid sodium salt-propyl lacrylate was identified by FTIR and Melting point. The influence factors of the synthesis process were studied. The optimal condition of the synthesis of ring-closing reaction and esterification was gained. Through the synthesis method, a corresponding synthesis of lauric acid, 14 acid, palmitic acid, 18 acid were gained. Then they were on the surface tension tests to determine the critical micelle concentration.

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