Polymerizable Esters of Lactic Acid. α-Carbalkoxyethyl Acrylates and Methacrylates

Sun

J of Applied Polymer Sci

et al. 2003

A series of novel crosslinkers, polyethylene glycol diacrylate (PEGDA) with different molecular weights, were prepared, consisting of acryloyl end groups and the PEG backbones. The corresponding poly(sodium acrylate) superabsorbents of 60 mol % neutralization degree were synthesized by using ammonium persulfate and dimethylaminoethyl methacrylate as redox initiators in aqueous solution. PEGDA was characterized by FTIR and 1 H-NMR. The maximum of water absorbency (Q) of superabsorbents occurred at a specific mole fraction of crosslinker; Q-values increased with increasing molecular weight of PEGDA at the same mole fraction, whereas the water absorption rate was the opposite, in which Q-values decreased gradually with time (Ͼ24 h). Compared with superabsorbents containing methylene bisacrylamide crosslinker with PEGDA, the Qvalue of the former was significantly less than that of the latter, although levels of the residual monomer and the soluble polymer were opposite.

Section: Methodsmentioning

confidence: 99%

Water absorbency of poly(sodium acrylate) superabsorbents crosslinked with modified poly(ethylene glycol)s

Sun

J of Applied Polymer Sci

et al. 2003

Macro Chemistry & Physics

“…1 Chemical Plant) according to a literature procedure. [20] Cuprous bromide (AR, Shanghai No. 1 Chemical Plant) was purified by washing with glacial acetic acid, followed by absolute ethanol, and then drying under vacuum.…”

Section: Methodsmentioning

confidence: 99%

Atom Transfer Radical Polymerization of Solketal Acrylate Using Cyclohexanone as the Solvent

Zhen

Wan

Liu

et al. 2005

Summary: Solketal acrylate (SA) was homopolymerized by atom transfer radical polymerization (ATRP) using CuBr/N,N,N′,N″,N″‐pentamethyldiethylenetriamine as the catalyst and cyclohexanone as the solvent with controlled molecular weights and low polydispersities. The prepared bromine‐terminated homopolymers, PSA, were used as macroinitiators to initiate polymerization of tert‐butyl acrylate (tBA) under similar ATRP conditions to produce diblock copolymers, PSA‐b‐PtBA, with controlled molecular weights and low polydispersities. ATRP of SA using bromine‐terminated PtBA as the macroinitiator was also carried out and diblock copolymers, PtBA‐b‐PSA, were obtained. The PSA block was selectively hydrolyzed by stirring for 3 h in 6 N HCl/THF (1/9, v/v) at room temperature to form a poly(glycerol monoacrylate) block. Both blocks of PSA and PtBA were hydrolyzed by stirring in anhydrous trifluoroacetic acid (TFA)/dichloromethane for 4 h, then adding water to the system and stirring for another 3 h to form corresponding diblock copolymers of glycerol monoacrylate and acrylic acid.Kinetic plot for the atom transfer radical polymerization of solketal acrylate at 90 °C.magnified imageKinetic plot for the atom transfer radical polymerization of solketal acrylate at 90 °C.

“…N-Isopropylacrylamide (NIPAAm) was synthesized from acrylonitrile and isopropyl alcohol [13]. Acryloyl chloride was always freshly prepared from acrylic acid and phosphorus trichloride [14]. HL60 cells (Human promyelocytic leukemia) were purchased from Shanghai Institute Cell Biology, Chinese Academy of Sciences.…”

Section: Methodsmentioning

confidence: 99%

Preparation of new polymer from podophyllotoxin derivative

et al. 2001

The new monomer, 4α-acrylpodophyllotoxin(APPT) was synthesized from reaction of acryloyl chloride with the 4α-hydroxy of podophyllotoxin. The homo-and copolymer of new monomer with NIPAAm/AAm have been prepared by free radical polymerization. The new monomer and polymers have been characterized by IR, 1 Hand 13 C-NMR spectra. The homopolymer have low the molecular weight but it is not oligomer, and the molecular weight of copolymer increased with decreasing new monomer content. The composition of copolymers was close to the original monomer composition. The distinction of antitumor activity among podophyllotoxin, new monomer and homopolymer was smaller. The copolymer with NIPAAm (The PAPPT content (mol-%) =43.7%) did not exhibit any antitumor activity at present condition of experimentation.