Preparation of hyperbranched polyamidoamine polymer–ultrafine silica hybrid composite

Abstract

Grafting of hyperbranched polyamidoamine (PAMAM) polymer onto ultrafine silica was prepared. First, an initiating site was incorporated into silica surface by treating silica particle with 3-aminopropyltriethoxysilane producing amino functionalized silica. Then grafting of hyperbranched PAMAM was performed by repetitive reactions between Michael addition of silica amino groups to methyl acrylate (MA) and amidation of the resulting terminal methyl ester groups with ethylenediamine (EDA). Excessive amounts of MA and EDA present in each step were removed by a rotary evaporator and dialysis separation, respectively. FT-IR analysis was employed to monitor the propagation of hyperbranched PAMAM on silica which was carried out until reaching the generation of 3.0. The yellowish liquid product was obtained. Amino group content in each generation was determined which was found significantly lower than theoretical value due to unavoidable side reactions. Laser light scattering and SEM results revealed that the particulate agglomerate was disaggregated into finer particle size as hyperbranched PAMAM generation increased.

Chemical modification of chitosan with cationic hyperbranched dendritic polyamidoamine and its antimicrobial activity on cotton fabric

“…It should be noted that the intensity of amine groups in the spectrum of the G1.5 hyperbranched PAMAM significantly decreases as a result of the Michael addition which converted the amine group of G1.0 PAMAM to a terminal methyl ester group. The FT-IR spectrum for G2.0 is not presented which was found in similar manner to that shown in the previous report (Punyacharoennon & Srikulkit, 2008).…”

“…For example, quaternized PAMAM dendrimers have a potent antimicrobial activity (Chen et al, 2000). In another aspect, 'dendrimer-like' hyperbranched polyamidoamine can be incorporated into silica (Punyacharoennon & Srikulkit, 2008) or chitosan powder surface (Tsubokawa & Takayama, 2000), resulting in hybrid materials with versatile functionalities.…”

Hyperbranched Polymers in Modifying Natural Plant Fibers and Their Applications in Polymer Matrix Composites—A Review

“…There are many published articles on the modification of nano-SiO 2 , carbon nanotubes, carbon fiber, glass fiber, graphene, and other reinforcements by the hyperbranched polymers. − However, the modification of the natural plant fiber is mainly concentrated in the textile field and its application in polymer matrix composites is very limited. The effects of various hyperbranched polymers on the modification of different reinforcements are systematically summarized in Table . − …”

Grafting polymer chains bearing an N‐succinimidyl activated ester end‐group onto primary amine‐coated silica particles and application of a simple, one‐step approach via nitroxide‐mediated controlled/living free‐radical polymerization

“…), which is not very convenient for polymer synthesis, analysis and storage owing to the sensitivity of this functional group to hydrolysis and self‐condensation. Alternatively, it is quite easy and very common to turn the surface SiOH groups into primary amines using condensation with 3‐aminopropyltriethoxysilane (APTES) 29–31. On this basis, the coreactive function can be an activated‐ester like an N ‐succinimidyl ester (NSE).…”

“…Alternatively, it is quite easy and very common to turn the surface SiAOH groups into primary amines using condensation with 3-aminopropyltriethoxysilane (APTES). [29][30][31] On this basis, the coreactive function can be an activated-ester like an N-succinimidyl ester (NSE). The coupling of a primary amine with an activated ester to form an amide linkage is an efficient synthetic route frequently used by biochemists and has already been employed to functionalize silica surface with biological molecules for instance.…”