نتایج جستجو برای: hyperbranched copolymers

تعداد نتایج: 9697  

2017
Milica Stanković Christine Hiemstra Hans de Waard Johan Zuidema Rob Steendam Henderik W. Frijlink Wouter L.J. Hinrichs

In this study, novel hydrophilic multiblock copolymers composed of semi-crystalline poly(ε-caprolactone) [PCL] blocks and amorphous blocks consisting of poly(D,Llactide) (PDLA) and poly(ethylene glycol) (PEG) [PDLA-PEG] were synthesized. The block ratio of these [PDLA-PEG]-b-[PCL] multiblock copolymers was varied and the degradation of implants prepared of these polymers by hot melt extrusion (...

Journal: :Macromolecular rapid communications 2016
In-Sik Kim In-Bok Kim Dong-Yu Kim Seong-Hoon Kwon Do-Kyeong Ko

The femtosecond transient absorption (TA) characterization of a new benzothiadiazole (BT)-based donor-acceptor conjugated copolymer, poly[(2,6-dithieno[3,2-b:2',3'-d]thiophene)-alt-(4,7-di(4-octyldodecylthiopen-2-yl)-2,1,3-benzo[c][1,2,5]thiadiazole (PBT), as well as its fluorinated derivatives, PFBT and PDFBT, is carried out. Additionally, bulk heterojunction (BHJ) films consisting of the copo...

2017
Iwona Kwiecień Iza Radecka Marek Kowalczuk Katarzyna Jelonek Arkadiusz Orchel Grażyna Adamus

The novel copolymers composed of poly-γ-glutamic acid (γ-PGA) and oligoesters have been developed. The structures of the obtained copolymers including variety of end groups were determined at the molecular level with the aid of electrospray ionization multistage mass spectrometry (ESI-MSn). The fragmentation experiment performed for the selected sodium adducts of the copolymers confirmed that t...

2015
Chainika Jangu Jing-Han Helen Wang Dong Wang Gregory Fahs James R. Heflin Robert B. Moore Ralph H. Colby Timothy E. Long

Reversible addition–fragmentation chain transfer (RAFT) polymerization enabled the synthesis of welldefined A–BC–A triblock copolymers containing a synergy of pendant ether and imidazolium sites. The soft central BC block comprises low Tg di(ethylene glycol) methyl ether methacrylate (DEGMEMA) and 1-(4-vinylbenzyl) methyl imidazolium units. External polystyrene blocks provide mechanical reinfor...

2005
P. SAVITHA D. N. SATHYANARAYANA

A series of poly(o-/m-toluidine-co-o-/m-chloroaniline) copolymers of different compositions were synthesized by an emulsion method with ammonium persulfate as the oxidant. The conductivity of the copolymers was two to five orders of magnitude higher than that of the homopolymers poly(o-toluidine) and poly(m-chloroaniline). Among the copolymers, the copolymer of o-toluidine and m-chloroaniline e...

2014
Yu Shao Yong-Guang Jia Changying Shi Juntao Luo X. X. Zhu

A series of block and random copolymers consisting of oligo(ethylene glycol) and cholic acid pendant groups were synthesized via ring-opening metathesis polymerization of their norbornene derivatives. These block and random copolymers were designed to have similar molecular weights and comonomer ratios; both types of copolymers showed thermosensitivity in aqueous solutions with similar cloud po...

2003
YI YI XINHUA WAN XINGHE FAN RONG DONG QIFENG ZHOU

A series of novel rod–coil diblock copolymers on the basis of mesogenjacketed liquid-crystalline polymer were successfully prepared by atom transfer radical polymerization from the flexible polydimethylsiloxane (PDMS) macroinitiator. The hybrid diblock copolymers, poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene}-blockpolydimethylsiloxane, had number-average molecular weights (Mn’s) ranging fr...

2011
Anna Calabrese Andrea Pellegrino Riccardo Po Nicola Perin Alessandra Tacca Luca Longo Nadia Camaioni Francesca Tinti Siraye E. Debebe Salvatore Patanè Alfio Consoli

We report the synthesis and the optoelectronic characterization of a new family of random conjugated copolymers based on 9,9-bisalkylfluorene, thiophene and benzothiadiazole monomers unit synthesized by a palladiumcatalyzed Suzuki cross-coupling reaction. The photophysical, thermal, electrochemical properties were investigated. The electronic structures of the copolymers were simulated via quan...

Journal: :The Journal of biological chemistry 1979
H Sternlicht I Ringel

Colchicine.tubulin complex (CD) inhibits microtubule assembly. We examined this inhibition under conditions where spontaneous nucleation was suppressed and assembly was restricted to an elongation polymerization. We found that CD inhibited assembly by a mechanism which preserved the ability of microtubule ends to add tubulin. This observation is inconsistent with the end-poisoning model which r...

2015
Anjan Kumar Mohanty Utpal Jana Prabal Kumar Manna Guru Prasad Mohanta

The amphiphilic block copolymers are composed of various combinations of hydrophilic and hydrophobic block unimers. The variation in unimer ratio alters the surface as well as micelle-forming properties of the block copolymers. These nanoscopic micelles have the ability to encapsulate hydrophobic compounds and act as potential drug carrier. MePEG-PCL copolymers with various block lengths were s...

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