نتایج جستجو برای: hyperbranched copolymers

تعداد نتایج: 9697  

Microwave irradiation was used to synthesize PEG-PCL and PEG-PLA copolymers that are composed of biodegradable polymers including PEG, PLA, and PCL. These copolymers were used for loading docetaxel in nanoparticles. Single emulsion-solvent evaporation technique was applied for preparing the PEG-PLA and PEG-PCL mixed nanoparticles (micelles and polymersomes) with different proportions, including...

Journal: :iranian journal of pharmaceutical research 0
pankaj kumar soa university, bhubneshwar, orissa, india ashok laxmanrao ganure sahyadri college of pharmacy, sangola, solapur, india bharat bhusan subudhi school of pharmaceutical sciences, siksha o anusandhan university, bhubaneswar, india shubhanjali shukla department of pharmaceutics, indian institute of technology (banaras hindu university), varanasi, india

the present investigation deals with the development of controlled release tablets of salbutamol sulphate using graft copolymers (st-g-pmma and ast-g-pmma) of starch and acetylated starch. drug excipient compatibility was spectroscopically analyzed via ft-ir, which confirmed no interaction between drug and other excipients. formulations were evaluated for physical characteristics like hardness,...

Journal: :Soft matter 2015
Hannah E Rogers Pierre Chambon Sam E R Auty Faye Y Hern Andrew Owen Steve P Rannard

The combination of linear polymers with dendritic chain-ends has led to numerous studies of linear-dendritic polymer hybrid materials. Interchain branching within the linear segment of these materials has recently extended this concept to the formation of soluble hyperbranched-polydendrons. Here, the introduction of amphiphilicity into hyperbranched-polydendrons has been achieved for the first ...

2006
Emilie Barriau Holger Frey Anton Kiry Manfred Stamm Franziska Gröhn

The preparation of carboxylated hyperbranched polyglycerols of narrow polydispersity was achieved by modification (78-90%) of the hydroxyl end groups via Michael addition of acrylonitrile, followed by hydrolysis. High conversion could only be achieved for low molecular weight starting materials (520 and 1,030 g mol-1). The solution properties of the resulting materials were investigated by dyna...

Journal: :Biochemical and biophysical research communications 2016
Leonid Breydo Ben Newland Hong Zhang Anne Rosser Carsten Werner Vladimir N Uversky Wenxin Wang

Aggregation of α-synuclein is believed to play an important role in Parkinson's disease and in other neurodegenerative maladies. Small molecule inhibitors of this process are among the most promising drug candidates for neurodegenerative diseases. Dendrimers have also been studied for anti-fibrillation applications but they can be difficult and expensive to synthetize. Here we show that RAFT po...

2008
XUEHAO HE JING TANG

Self-condensing vinyl hyperbranched polymerization (SCVP) with A-B* type monomer is simulated applying Monte Carlo method using 3d bond fluctuation lattice model in three-dimensional space. The kinetics of SCVP with zero active energy of reaction is studied in detail. It is found that the maximal number–average and weight–average polymerization degrees and the maximal molecular weight distribut...

Journal: :Molecules 2018
In-Yup Jeon Hyuk-Jun Noh Jong-Beom Baek

Hyperbranched macromolecules (HMs, also called hyperbranched polymers) are highly branched three-dimensional (3D) structures in which all bonds converge to a focal point or core, and which have a multiplicity of reactive chain-ends. This review summarizes major types of synthetic strategies exploited to produce HMs, including the step-growth polycondensation, the self-condensing vinyl polymeriz...

Journal: :Progress in Polymer Science 2009

Journal: :Chemical communications 2014
Gyoungsik Kim A-Reum Han Hae Rang Lee Junghoon Lee Joon Hak Oh Changduk Yang

Two acceptor-acceptor (A-A) type copolymers (PIIG-BT and PIIG-TPD) with backbones composed exclusively of electron-deficient units are designed and synthesized. Both copolymers show unipolar n-type operations. In particular, PIIG-BT shows electron mobility of up to 0.22 cm(2) V(-1) s(-1). This is a record value for n-type copolymers based on lactam cores.

Journal: :علوم و تکنولوژی پلیمر 0
محمدعلی سمسارزاده محمدرضا رستمی درونکلا

the microstructure and thermal properties of the synthesized block copolymers and terpolymers via atom transfer radical polymerization (atrp) were studied. the mole fraction of the blocks and chain length of the pvac-b-pma block copolymers were estimated with 1h nmr spectroscopy.differential scanning calorimety measurement shows two different transitions at 36°c and 8°c assigned to pvac and pma...

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