Preparation and properties of hyperbranched poly(amine‐ester) films using acetal cross‐linking units

Abstract

Novel films based on cross-linked hyperbranched poly(amine-ester) (HPAE) were prepared by cross-linking the terminal hydroxyl groups of HPAE using glutaraldehyde (GA). The cross-linking process was monitored by measuring the intrinsic viscosity of HPAE/GA in N,N-dimethylacetamide. The surface structures of the cross-linked HPAE films obtained from different HPAE/GA ratios were imaged using atom force microscopy, and their properties were characterized in terms of hydrophilicity, solvent swelling, mechanics, and protein adsorption. It was found that the static contact angle was <32.9 • , tensile strength was >0.35 MPa, elongation at break was >9.2 %, swelling degree was >63 % in water, and bovine serum albumin adsorption was relatively low. The results indicate that cross-linked HPAE films have a strong application potential in many areas.

Synthesis and characterization of an amphiphilic hyperbranched poly(amine‐ester)‐co‐D,L‐lactide (HPAE‐co‐PLA) copolymers and their nanoparticles for protein drug delivery

“…24 The results of different generation HPAE-OHs were showed in the Table I. It could be clearly seen that with the increase of generation the hydroxyl values were close to theoretical value, which indicated that the structure was apt to regulation.…”

“…24 HPAE-OHs was dissolved in excess benzoic anhydride with imidazole as a catalyst (in pyridine) at 80 C of water bath for 3 hours to acetylate the hydroxyl groups in HPAEOHs. By back-titrating the above mixture with NaOH solution (0.1 mol L…”

Poly(amidoamine)-mediated self-assembly of hydroxyl-modified anatase TiO2 nanocrystals on cotton fabric

“…The small size was probably due to the volume restriction effect of HBPAE micelles. 27) The HRTEM image of TiO 2 NCs showed the unidirectional lattice fringes of the ( 101 3.2 Self-assembly of TiO 2 NCs on the surface of cotton fabric The modification of the surface chemistry of cotton fibers is necessary prior to the assembly of TiO 2 NCs on a cotton surface. A cotton fiber is mainly composed of cellulose with repeating units of 1,4-D-glucopyranose.…”

Novel Amphiphilic Hyperbranched Poly (amine-ester) Copolymers Nanoparticles as Protein Drug Delivery

“…The hydroxyl values of different generation HPAE-OHs were measured and calculated by the method described in the previous paper [22]. The results of different generation HPAE-OHs were showed in the Table 1.…”

“…The hydroxyl values of HPAE-OHs were determined by the following method [22]. HPAE-OHs was dissolved in excess benzoic anhydride with imidazole as a catalyst (in pyridine) at 80°C of water bath for three hours to acetylate the hydroxyl groups in HPAE-OHs.…”