VT  (monomer)     Vinyltoluene

VT monomer produced by Deltech Corporation is a mixture of methylstyrene isomers with approximately 55% meta and 45% para isomer distribution. The monomer has chemical properties and polymerization behavior similar to styrene monomer but provides superior properties in many applications. Applications requiring a single methylstyrene isomer should consider Deltech's PMS monomer which contains 99% para-methylstyrene.
     VT Molecule     Molecular Weight:   118.18

Typical Isomer Distribution: 45% Para
 55% Meta

VT is a reactive monomer which readily polymerizes to form a high clarity, colorless polymer with excellent electrical and physical properties. Like styrene monomer, VT monomer can be polymerized by any of the conventional methods of initiation and in the presence of inert materials such as fillers, dyes, solvents, resins, rubbers and plasticizers. Copolymerization of VT monomer with other monomers such as acrylate, acrylonitrile, butadiene, divinylbenzene or methacrylate and maleic anhydride yields products with wide variations of physical properties.

VT monomer is widely used in the coatings industry as a modifier for drying oils and oil modified alkyds. These monomer modified resins have good chemical resistance, fast drying, durability, excellent solution color and color retention properties. Another important advantage for VT modified oils and alkyds is their solubility in low cost solvents.

VT monomer is used as a replacement for styrene monomer in unsaturated polyester resins (UPR) where high temperature cures combined with less shrinkage are desired. UPRs formulated with VT monomer exhibit a lower vapor pressure at any temperature and a higher flash point. Deltech Corporation has conducted research in conjunction with BP Amoco on lowering emissions from UPRs using VT monomer. Research results showing VT resin properties are available.

RESEARCH REPORT

Typical precautions in handling VT monomer include wearing protective clothing, the use of impermeable gloves and use in a well ventilated area. Do not store in direct sunlight. Maintain storage temperature below 75oF if extended storage is required. VT monomer contains the polymerization inhibitor tertiary butylcatechol (TBC) to reduce polymer formation during storage. For other product safety and toxicological information, please consult the Material Safety Data Sheets for VT monomer.

Typical Monomer Values
Chemical Analysis Test Method VT PMS TBS Styrene
           
Purity, Weight % vinyl GC 99.2 99.2 >98.0 99.7
Isomer Distribution GC        
     Para %   43.0 99.0 95.0 --
     Meta %   56.0 1.0 5.0 --
     Ortho %   1 -- -- --
Polymer, ppm ASTM D-2121-84 Neg. Neg. Neg. Neg.
Inhibitor, ppm TBC ASTM D-4590 12 25 50 12
           
Physical Properties          
           
Refractive Index, n25D   1.54 1.54 1.52 1.54
Density, g cm-3 @ 25oC   0.893 0.892 0.884 0.902
Surface Tension, dynes-cm-1 @ 25oC   31 34 29 32
Boiling Point, oC @ 760 mm HG   168 170 219 145
Freezing Point, oC   -77 -34 -38 -31
Volume Concentration on Polymerization          
% calculated @ 25oC   12 12  7 17
Vapor Pressure, mm HG at          
     40oC (104oF)   4 4 1 14
     80oC (176oF)   35 35 6 90
   120oC (248oF)   176 170 37 368
   160oC (320oF)   341 325 77 661
Heat of Polymerization, Kcal mole-1   15-17 15-17 16-18 17
Copolymerization Q & e values          
     Q   1.06 1.27 1.39 1.00
     e   -0.78 -0.98 -0.90 -0.80
Heat of Vaporization, cal/g @25oC   -- 98.2 -- 102.4
Specific Heat, cal/goC @25oC   -- 0.413 -- 0.408
 
Solvent Compatibility: Completely compatible with Acetone, Carbon Tetrachloride, Benzene, N-Heptane and Ethanol
 
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Nothing contained herein is to be construed as a recommendation to use any product in conflict with any patent. Deltech Corporation makes no warranties as to the fitness of merchantability of any product referred to, no guarantee of satisfactory results from reliance upon contained information or recommendation, and disclaims all liability for any resulting loss or damage.

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