Synthesis of Novel Rod-Coil Amphiphilic Block Copolymers PAA-b-DPS with Fréchet-Type Dendronized Polystyrene and Poly(acrylic acid)

2008 ◽  
Vol 29 (9) ◽  
pp. 757-762 ◽  
Author(s):  
Zhuo Yi ◽  
Yanhong Zhang ◽  
Yongming Chen ◽  
Fu Xi
Keyword(s):  
Block Copolymers ◽  
Acrylic Acid ◽  
Amphiphilic Block Copolymers ◽  
Poly Acrylic Acid

scholarly journals Design of a pH-responsive Conductive Nanocomposite Based on MWCNTs Stabilized in Water by Amphiphilic Block Copolymers

2019 ◽  
Author(s):  
Frank den Hoed ◽  
Andrea Pucci ◽  
Francesco Picchioni ◽  
Patrizio Raffa
Keyword(s):  
Electrical Conductivity ◽  
Block Copolymers ◽  
Acrylic Acid ◽  
Zeta Potential ◽  
Amphiphilic Block Copolymers ◽  
Ph Responsive ◽  
Sensing Applications ◽  
Responsive Behavior ◽  
Ph Variations ◽  
Poly Acrylic Acid

Homogeneous water dispersions of MWCNTs were prepared by ultrasonication in the presence of an amphiphilic polystyrene-block-poly(acrylic acid) (PS-b-PAA) copolymer. The ability of PS-b-PAA to disperse and stabilize MWCTNs was investigated by UV-vis, SEM and zeta potential. It is shown that the copolymer can disperse nanotubes directly by sonication in water. The results show that the addition of a styrene block to PAA enhances the dispersion efficiency compared to pure PAA, possibly due to the nanotube affinity with the polystyrene moiety. Notably, the dispersions show an evident pH-responsive behavior, being MWCNTs reaggregation promoted in basic environment. Furthermore, composites obtained by drop casting display electrical conductivity responsive to pH variations, showing the potential of such materials for sensing applications.

High-performance poly(acrylic acid) hydrogels formed with a block copolymer crosslinker containing amino-acid derivatives

Soft Matter ◽  
2019 ◽  
Vol 15 (37) ◽  
pp. 7381-7389 ◽  
Author(s):  
Rui Zhang ◽  
Hengzhi Ruan ◽  
Tianxu Zhou ◽  
Qionglong Fu ◽  
Hongwei Peng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Amino Acid ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Acrylic Acid ◽  
High Performance ◽  
Amino Acid Derivatives ◽  
Self Healing ◽  
Poly Acrylic Acid

Two block copolymers containing amino-acid derivatives were employed as a macro-crosslinker to prepare high performance PAA hydrogels concluding desirable mechanical properties and self-healing abilities, as well as notch-insensitivity.

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