Self-assembly of pH-sensitive random copolymers: Poly(styrene-co-4-vinyl -pyridine) Recently, the random copolymer was widely studied because of simple synthesis, low cost and the various morphologies of self-assembled nanoparticles.

Study on pH sensitivity 0f PVP/CHI blend hydrogels;

The research about pH sensitivity of AAm/Ac hydrogel;

The results show that the hydrogels have amphiphilicity and different pH sensitivity compared with chitosan.

Synthesis and characterization of a novel pH-sensitive coating materials;

The structure and properties of temperature-sensitive hydrogels,pH-sensitive hydrogels and pH/temperature-sensitive hydrogels and their applications in drug delivery systems were reviewed.

From study of swelling ratios of the PIAc,PAAc and IPN hydrogels in different pH conditions,swelling ratio of the hydrogels increases as the pH rise was found,the hydrogels had pH-sensitive character,but the swelling property of IPN hydrogel was different of the swelling properties of the PIAc and PAAc hydrogels.

A thermo and pH sensitive interpenetrating network hydrogels beads were prepared with both calcium alginate and PNIPAAm hydrogels which were synthesized by free radical aqueous solution polymerization using APS(ammonium persulphate)/Na 2S 2O 5(Sodium pyrosulfite) as redox initiators in a simultaneous interpenetrating network process.

An interpenetrating network like hydrogel of PE-g-AAm/AAc with sharp pH sensitive was obtained.

Preparation of N-carboxyethyl chitosan hydrogel and its pH-sensitivity;

pH-sensitivity investigation of carboxymethyl chitosan modified doxorubicin nanoliposomes;

The degree of grafting,permeation performance and pH-sensitivity of the grafted membrane were studied respectively.

Studied the influence of concentrations of cross-linking agent, swelling capacity in different pH, temperature-sensitivity and pH-sensitivity of the hydrogel.