monomer 1,4-bis[4-(3-acryloyloxypropyloxy)benzoyloxy]-2-methylbenzene
(RM257, Wilshire Technologies) was mixed in a 1.1:1 molar ratio with n-butylamine (nBA, Sigma-Aldrich) along with 4 wt % of a
photoinitiator, Omnirad-369 (2-benzyl-2-(dimethylamino)-1-[4-(morpholinyl)phenyl)]-1-butanone).17 (link) The materials were placed in an oil bath held
at 75 °C during mixing and oligomerization. The solution was
mixed for 15 min at 500 rpm using a magnetic stirrer before being
left to sit in the oil bath for 1 h to partially oligomerize.