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The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass

03-Feb-2016 | Thomas Swift; Linda Swanson; Mark Geoghegan; Stephen Rimmer, Soft Matter, 2016

Fluorescence spectroscopy on a series of aqueous solutions of poly(acrylic acid) containing a luminescent label showed that polymers with molar mass, Mn < 16.5 kDa did not exhibit a pH responsive conformational change, which is typical of higher molar mass poly(acrylic acid). Below this molar ...


Enantioselective Assembly of Amphipathic Chiral Polymer and Racemic Chiral Small Molecules during Preparing Micro-scale Polymer Vesicles

02-Feb-2016 | Yingjue Wang; Zhuang Yiwei; Jiangang Gao; gang zou; Qijin Zhang, Soft Matter, 2016

Enantioselective assembly is observed during preparing vesicles from a mixture solution of an amphipathic block copolymer bearing pendent chiral L (or D)-phenylalanine groups in hydrophobic segments and racemic chiral small molecules. Primary experimental results reveal that racemic chiral small ...


Preparation and characterization of poly(lactic‐co‐glycolic acid)/chitosan electrospun membrane containing amoxicillin‐loaded halloysite nanoclay

28-Jan-2016 | Sh. Tohidi, A. Ghaee, J. Barzin, Polymers for Advanced Technologies, 2016

The main attitude of new wound dressings with biocompatible natural or synthetic polymers is improving and accelerating the healing process. In this study, halloysite nanotubes (HNTs) loaded with a model antibiotic drug, amoxicillin (AMX), were incorporated within poly(lactic‐co‐glycolic acid) ...


Understanding the Thermosensitivity of POEGA-Based Star Polymers: LCST-type Transition in Water vs. UCST-type Transition in Ethanol

26-Jan-2016 | Lei Hou; Qijing Chen; Zesheng An; peiyi wu, Soft Matter, 2016

The lower critical solution temperature (LCST) transition in water and upper critical solution temperature (UCST) transition in ethanol of poly(oligo(ethylene glycol) acrylate) (POEGA)-based core cross-linked star (CCS) polymers have been investigated and compared by employing turbidity, dynamic ...


Temperature-Responsive Gene Silencing by a Smart Polymer

26-Jan-2016 | Mingming Wang; Yiyun Cheng, Bioconjugate Chemistry, 2016

Intracellular siRNA release is a crucial step in efficient gene silencing mediated by cationic polymers. Here, we show an example of temperature change-induced intracellular siRNA release and silencing using a temperature-responsive polymer consisting of dendrimer, poly(N-isopropylacrylamide) and ...


Improvement of the mechanical behavior of bioplastic poly(lactic acid)/polyamide blends by reactive compatibilization

23-Jan-2016 | JeongIn Gug, Margaret J. Sobkowicz, Journal of Applied Polymer Science, 2016

ABSTRACT Polymer blends are of significant interest for reinforcing bioplastics via addition of a second polymer and a blend compatibilizer or in situ reaction. However, increased costs associated with additional materials and extra processing steps can limit the viability of this solution. ...


Vanadium Modification Effects on the (SiO2/MgO/MgCl2)•TiClx Ziegler–Natta Polyethylene Catalyst

22-Jan-2016 | Jingwen Wang, Ruihua Cheng, Xuelian He, Zhen Liu, Ning Zhao, Boping Liu, Macromolecular Reaction Engineering, 2016

A novel vanadium‐modified (SiO2/MgO/MgCl2)·TiClx Ziegler–Natta ethylene polymerization catalyst with much better catalytic performance is successfully developed. The catalyst is prepared by co‐impregnation of aqueous solution of water‐soluble magnesium and vanadium compounds on SiO2, and a ...


The formation of the S‐shaped edge‐on lamellae on the thin porous polylactic acid membrane via phase separation induced by water microdroplets

20-Jan-2016 | Ruiqing Hu, Yuping Pi, Na Wang, Qian Zhang, Jinqi Feng, Weilin Xu, Xia Dong, Dujin Wang, Hongjun Yang, Journal of Applied Polymer Science, 2016

ABSTRACT Biodegradable polymers have received increased attention due to their potential application in the medicine and food industries; in particular, poly(lactic acid) (PLA) is a primary biopolymer because of its excellent biocompatibility and absorbability features. In this study, a porous ...


Role of Aggregates in the Luminescence Decay Dynamics of Conjugated Polymers

20-Jan-2016 | Rajarshi Chakraborty; Lewis J Rothberg, Journal of Physical Chemistry A, 2016

Fluorescence quantum yields of conjugated polymer films are systematically lower than their counterparts in dilute solution. Films also exhibit a long “temporal tail” in their fluorescence decay dynamics not present in solution. We study the spectroscopy, excitation wavelength dependence, ...


Synthesis, characterization, and thin‐film properties of 6‐oxoverdazyl polymers prepared by ring‐opening metathesis polymerization

19-Jan-2016 | Joseph A. Paquette, Sabastine Ezugwu, Vishal Yadav, Giovanni Fanchini, Joe B. Gilroy, Journal of Polymer Science Part A: Polymer Chemistry, 2016

ABSTRACT Redox‐active 6‐oxoverdazyl polymers were synthesized via ring‐opening metathesis polymerization (ROMP) and their solution, bulk, and thin‐film properties investigated. Detailed studies of the ROMP method employed confirmed that stable radical polymers with controlled molecular weights ...


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