Oligo ethylene glycol methyl ether methacrylate

Nanofibrillated cellulose hydrogel (2%) was prepared as previously reported using a mechanical homogenization method [37 ,38 (link)]. Nanocrystalline cellulose hydrogel (11.9%) was purchased from the Process Development Center, University of Maine. m-Cresol, lithium chloride, N,N-dimethylacetamide, chlorobenzene, phenol, polyethylenimine (PEI) (number average molecular mass Mn = 60 kg/mol), maleic acid (MA), sodium hypophosphite, glycidyl methacrylate (GMA, 97%), azoisobutyronitrile (AIBN), oligo (ethylene glycol) methyl ether methacrylate (OEGMA, Mn = 950 g/mol, stabilized with inhibitors), and inhibitor removers (kits for removing hydroquinone and monomethyl ether hydroquinone (MEHQ) and tert-butylcatechol (BHT)) were purchased from Sigma-Aldrich (St. Louis, MO, USA).
Silicon wafers (100 crystal plane) with a native oxide layer were purchased from University Wafer (South Boston, MA, USA). A polyethylene terephthalate (PET) film (0.50 mm thick) and a nylon 6,6 (PA 6,6) film (0.5 mm thick) were purchased from GoodFellow, Coraopolis, PA, USA. A cellophane film (regenerated cellulose) 0.03 mm thick was provided by Thermetrics. Cotton (100%, plain weave), nylon 6,6 (100%, spun, plain weave), cotton/polyester, PET (50%/50%, plain weave), polyester, and PET (100%, spun, plain weave) fabrics were purchased from Testafabrics, Inc., West Pittston, PA, USA.

Methacrylic anhydride,
1,6-hexanediol, triethylamine (TEA), 4-(dimethylamino)pyridine (DMAP), p-toluenesulfonic acid monohydrate, pyrrolidine 99%, oligo(ethylene
glycol)methyl ether methacrylate (OEGMA, number-average molecular
weight M_n = 500 and 300
g/mol), di(ethylene glycol)methyl ether methacrylate (M_n = 188.22 g/mol, 95%), and 2,2′-azobis(2-methylpropionitrile)
(AIBN) were purchased from Sigma-Aldrich. Ferric chloride hexahydrate
(FeCl₃·6H₂O) was purchased from Acros Organics.
The sulfur trioxide–pyridine complex (SO₃-Pyr) was
purchased from TCI Chemicals Europe. Sodium nitrite, ACS reagent grade,
was purchased from Carlo Erba Reagents S.r.l., Italy. 2-Cyanopropan-2-yl
dithiobenzoate (CPDB) chain-transfer agent was purchased from STREM
Chemicals, Inc., BISCHHEIM, France. All solvents were purchased from
Sigma-Aldrich except dimethylformamide and THF, which were procured
from VWR International, Milan, Italy. Water used for cloud-point determinations
was of Milli-Q grade. Chloroform-d was obtained from
Acros Organics and dimethylsulfoxide-d₆ (DMSO-d₆; glass ampules) from VWR International.
OEGMA and MEO₂MA were passed through a basic alumina column
to remove the inhibitor and stored at −20 °C until use.
DMSO was dried over 4 Å molecular sieves and stored under argon.
0.1 M HCl was standardized using anhydrous CaCO₃ and then
used to titrate 0.1 M sodium hydroxide immediately before use.