نتایج جستجو برای: hyperbranched copolymers

تعداد نتایج: 9697  

Journal: :Biomacromolecules 2003
Chao Gao Yimin Xu Deyue Yan Wei Chen

A novel approach to hyperbranched polymers is presented in this work. Hyperbranched polyesters with a large amount of terminal hydroxyl groups are prepared by a one-pot synthesis from commercially available AB-type and CD(n)-type monomers (n >/= 2). In this paper, Michael addition of diethanolamine (CD(2)) or N-methyl-d-glucamine (CD(5)) to methyl acrylate (AB) generates dominantly AD(n)-type i...

Journal: :Chemical Society reviews 2015
Indah Nurita Kurniasih Juliane Keilitz Rainer Haag

Hyperbranched polymers are obtained through one-step polymerization reactions and exhibit properties that are very similar to those of perfect dendrimer analogues. Therefore, hyperbranched polymers are a suitable alternative for perfect dendrimers as building blocks for dendritic nanocarrier systems. With regard to using soluble hyperbranched polymers as carrier systems, their flexible chains a...

Journal: :The Journal of chemical physics 2009
Tu C Le B D Todd P J Daivis A Uhlherr

Hyperbranched polymer melts have been simulated using a coarse-grained model and nonequilibrium molecular dynamics (NEMD) techniques. In order to determine the shear-induced changes in the structural properties of hyperbranched polymers, various parameters were calculated at different strain rates. The radii of gyration which characterize the size of the polymer were evaluated. The tensor of gy...

2014
Qun Chen Chengzhen Wei Yizhou Zhang Huan Pang Qingyi Lu Feng Gao

Single-crystalline hyperbranched nanostructures of iron hydroxyl phosphate Fe5(PO4)4(OH)3·2H2O (giniite) with orthorhombic phase were synthesized through a simple route. They have a well-defined dendrite fractal structure with a pronounced trunk and highly ordered branches. The toxicity test shows that the hyperbranched nanostructures have good biocompatibility and low toxicity level, which mak...

Journal: :Macromolecular Chemistry and Physics 2022

Topological geometry of poly(ionic liquid)s (PILs), such as brush-like, knot-like, hyperbranched and randomly coiled, often exerts a strong influence on their self-assembly behaviors. As primary topological form, the cyclic topology-derived effects have not been investigated PILs, which concerns synergy charges zero chain end. Herein, linear liquid) copolymers (co-PILs) with distributed counter...

Journal: :Biomaterials science 2015
Weiren Cheng Jatin N Kumar Yong Zhang Ye Liu

Vinyl-terminated hyperbranched poly(amido amine)s is obtained by Michael addition polymerization of 4-(aminomethyl)piperidine (AMPD) with a double molar N,N-cystaminebis(acrylamide) (BAC). Then an amphiphilic hyperbranched poly(BAC2-AMPD1)-PEG is produced via converting the vinyl groups to amines followed by PEGylation. Transmission electron microscopy (TEM), dynamic light scattering (DLS), and...

2017
Shuiping Li Qisheng Wu Huajun Zhu Qing Lin Chengshuang Wang

A core-shell particle was fabricated by grafting amino-terminated hyperbranched polymer to the surface of silica nanoparticles. The influences of core-shell particle contents on the tensile and impact strength of the epoxy thermosets modified with amino-terminated hyperbranched polymer were discussed in detail. For comparison, core-shell particle was added into the epoxy/polyamide system for to...

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