(Hydroxyethyl)methacrylate

Hydroxyethylmethacrylate or HEMA is the organic compound with the formula HOCH2CH2O2CC(Me)=CH2. It is a colorless viscous liquid that readily polymerizes. HEMA is a monomer that is used to make various polymers.

(Hydroxyethyl)methacrylate
Names
IUPAC name
2-Hydroxyethyl 2-methylprop-2-enoate
Other names
HEMA; hydroxyethylmethacrylate; glycol methacrylate; glycol monomethacrylate; hydroxyethyl methacrylate; ethylene glycol methacrylate; 2-(methacryloyloxy)ethanol
Identifiers
3D model (JSmol)
1071583
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.011.621
EC Number
  • 212-782-2
936557
KEGG
RTECS number
  • OZ4725000
UNII
Properties
C6H10O3
Molar mass 130.143 g·mol−1
Appearance Colourless liquid
Density 1.07 g/cm3
Melting point −99 °C (−146 °F; 174 K)[1]
Boiling point 213 °C (415 °F; 486 K)[1]
miscible
log P 0.50[2]
Vapor pressure 0.08 hPa
Hazards
Main hazards Eye irritation
GHS pictograms
GHS Signal word Warning
GHS hazard statements
 H315, H317, H319
P261, P264, P272, P280, P302+352, P305+351+338, P321, P332+313, P333+313, P337+313, P362, P363, P501
Flash point 97 °C (207 °F; 370 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Applications

Polyhydroxyethylmethacrylate is hydrophobic; however, when the polymer is subjected to water it will swell due to the molecule's hydrophilic pendant group. Depending on the physical and chemical structure of the polymer, it is capable of absorbing from 10 to 600% water relative to the dry weight. Because of this property, it was one of the first materials to be successfully used in the manufacture of soft contact lenses[3]

When treated with polyisocyanates, poly(HEMA) makes a crosslinked polymer, an acrylic resin, that is a useful component in some paints.[4]

Use in 3D printing

HEMA lends itself well to applications in 3D printing as it cures quickly at room temperature when exposed to UV light in the presence of photoinitiators. It may be used as a monomeric matrix in which 40nm silica particles are suspended for 3D glass printing.[5] When combined with a suitable blowing agent such as BOC Anhydride it forms a foaming resin which expands when heated.[6]

References
  1. "GPS Safety Summary 2-Hydroxyethyl methacrylate (HEMA)". July 2013.
  2. "2-hydroxyethyl methacrylate_msds".
  3. Blasco, Joe; Kehoe, Vincent J-R; The professional make-up artist : motion pictures, television, print, theatre; ISBN 0-9771580-0-4; LCC# PN2068.B53 2005
  4. Stoye, D.; Funke, W.; Hoppe, L.; et al. (2006). "Paints and Coatings". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a18_359.pub2.
  5. Kotz (20 April 2017). "Three-dimensional printing of transparent fused silica glass". Nature. 544 (7650): 337–339. doi:10.1038/nature22061. PMID 28425999.
  6. Wirth, D. (8 April 2020). "Highly Expandable Foam for Lithographic 3D Printing". ACS Appl. Mater. Interfaces. 12 (16): 19033–19043. doi:10.1021/acsami.0c02683. PMID 32267677.
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