2-(Dimethylamino) ethyl methacrylate (DMAEMA
) was bought from Aladdin and passed through a column filled with basic alumina to remove the polymerization inhibitors.
The mole ratio of template ((S)-ONZ) to functional monomers (HEMA and DMAEMA
) was 1:1.5.
These PMMA blocks were afterwards used as macrochain transfer agents (macroCTA) in a copolymerization using DMAEMA
as monomer and BPO as initiator.
0.1 g CQ and 0.1 mL DMAEMA
(photoinitiator/coinitiator) were added at a ratio of (Am + MBAm): CQ: DMAEMA
= 100: 1: 1.
The single-phase region of the microemulsion was determined visually by titrating aqueous solutions of SDS at different concentrations with DMAEMA
in screw capped glass tubes at room temperature with magnetic stirring.
Other additives included light initiator camphorquinone (CQ) with dimethylaminoethyl methacrylate (DMAEMA
) as the accelerator and butylated hydroxytoluene (BHT) as the photostabilizer.
The co-initiator (DMAEMA
) was used in the proportion 2:1 (co-initiator / photo-initiator, respectively) in agreement with other studies that found larger degree of conversion values in that proportion, when DMAEMA
was used with CQ.
Nearly monodisperse PZs have been synthesized by group transfer polymerization (GTP) of 2-(diniethylamino)ethyl methacrylate (DMAEMA
) followed by quantitative betainization using 1,3-propanesultone (40).
PDMAEMA hydrogels were prepared by free-radical crosslinking polymerization of DMAEMA
in the presence of the crosslinkers.
In this article, we report the synthesis of several azo diblock copolymers of 2-(dimethylamino)ethyl methacry-late (DMAEMA
) monomer with azobenzene methacrylates via reversible addition-fragmentation chain transfer (RAFT) polymerization.
N,N-dimethylamino-2-ethyl methacrylate (DMAEMA
, 99%, Aldrich) was dried over calcium hydride and distilled under reduced pressure before use.
The resins were activated for visible light polymerization by the addition of 1 wt% CQ and an equimolar amount of dimethylaminoethylmethacrylate (DMAEMA