PAA‐<i>g</i>‐PVAc Amphiphilic Graft Copolymer Synthesized by Atom Transfer Radical Polymerization

Zhang, Xiaohuan; Wang, Beidi; Yang, Dong; Zhang, Xiaohong; Li, Yuan; Tang, Qianqian; Hu, Jianhua

doi:10.1002/cjoc.200990381

Cited by 2 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lack of attention toward the bulk self-assembly study of random brushes might be due to the challenges associated with synthesizing well-defined binary cylindrical brushes. These synthetic obstacles have recently been removed because of the development in metathesis polymerization, , atom transfer radical polymerization (ATRP), − reversible addition–fragmentation chain-transfer (RAFT) polymerization, nitroxide-mediated radical polymerization (NMP), and “click” chemistry. − With these technologies in hand, we can now readily prepare well-defined binary graft copolymers and investigate the bulk self-assembly of binary cylindrical brushes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Bulk Self-Assembly of Well-Defined Binary Graft Copolymers

Hou

Liu

et al. 2013

Macromolecules

View full text Add to dashboard Cite

Six binary graft copolymers were synthesized, and their graft segregation in bulk was investigated. The copolymers were prepared by a one-pot method involving the quantitative grafting of alkyne-end-functionalized poly(n-butyl acrylate) (PBA-CCH) and poly(2-cinnamoyloxyethyl methacrylate) (PCEMA-CCH) onto poly(3-azide-2-hydroxypropyl methacrylate) (P(GMA-N3)) via click chemistry. Of these copolymers, three had a total PBA and PCEMA molar grafting density g of ∼20%, and their PBA volume fractions V B among PBA and PCEMA varied between 28% and 57%. V B was constant at ∼57%, while g varied between 9.8% and 29.5% for the other three samples. Bulk films were obtained by slowly evaporating the solvent from cast solutions of these copolymers. These films were then annealed above the glass transition temperatures of PBA and PCEMA to facilitate graft segregation. The graft segregation patterns were examined by performing transmission electron microscopy (TEM) analysis of thin sections of these films. The TEM results suggested that the grafted PBA chains formed a disordered wormlike phase in a PCEMA matrix at V B = 28%. At V B = 42% and 57%, PBA and PCEMA seemed to form alternating lamellae. In the former case, the PBA layers were thinner than the PCEMA layers, while the PBA layers were thinner in the latter case. All three samples with V B ∼ 57% probably possessed a lamellar morphology. The periodicity of the lamellae increased and the long-range ordering deteriorated as g increased.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Bulk Self-Assembly of Well-Defined Binary Graft Copolymers

Hou

Liu

et al. 2013

Macromolecules

View full text Add to dashboard Cite

show abstract

Molecular Hydrogels with Esterase‐like Activity

Yang

Wang

2013

Chin. J. Chem.

View full text Add to dashboard Cite

The development of molecular hydrogels that can be applied for mimicking bioactive molecules attracts extensive interests of researchers in fields of self-assembly. In this study, we reported on several molecular hydrogels based on naphthylacetic acid-peptides containing L-histidine formed by the heating-cooling process. All hydrogels exhibited higher activity to hydrolyze 4-nitrophenyl acetate (4-NPA) than the free L-histidine probably due the high density of L-histidine residue at the surface of self-assembled nanofibers. To calculate the 4-NPA hydrolysis rates, the Michaelis-Menten enzyme kinetics model was made. Among these gels, the gel of Nap-GFFYGHY possesses the highest enzyme activity of making the ester bond cleavage, which is approximately 25 times higher than that of the control (free L-histidine and Nap-GFFYGYY). These results indicate that molecular hydrogels with self-assembled nanofibers have great potential for the generation of self-assembled multivalent materials.

show abstract

PAA‐g‐PVAc Amphiphilic Graft Copolymer Synthesized by Atom Transfer Radical Polymerization

Cited by 2 publications

References 16 publications

Synthesis and Bulk Self-Assembly of Well-Defined Binary Graft Copolymers

Synthesis and Bulk Self-Assembly of Well-Defined Binary Graft Copolymers

Molecular Hydrogels with Esterase‐like Activity

Contact Info

Product

Resources

About