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646 Aktuelle Fachpublikationen zum Thema temperature

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Polyurethane-Grafted Chitosan as New Biomaterials for Controlled Drug Delivery

17.04.2015 | Arun Kumar Mahanta; Vikas Mittal; Nitesh Singh; Debabrata Dash; Sudip Malik; Mohan Kumar; Pralay Maiti, Macromolecules, 2015

The present investigation focuses on the grafting of chitosan (CHT) with diisocyanate terminated polyurethane. Solid state 13C NMR spectroscopy confirms the grafting reaction and the degree of substitution (DS) was calculated from the deconvoluted area of the corresponding NMR peak. Solubility ...

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Cross-Linked Thermally Rearranged Poly(benzoxazole-co-imide) Membranes Prepared from ortho-Hydroxycopolyimides Containing Pendant Carboxyl Groups and Gas Separation Properties

16.04.2015 | Mariola Calle; Hye Jin Jo; Cara M. Doherty; Anita J. Hill; Young Moo Lee, Macromolecules, 2015

The incorporation of small amounts of 3,5-diaminobenzoic acid (DABA) comonomer (usually 5–20 mol %) into an ortho-hydroxypolyimide (HPI) precursor constitutes a new methodology to easily improve the gas transport performance of thermally rearranged (TR) polymer membranes. Thermogravimetric ...

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Crystallization of Alternating Limonene Oxide/Carbon Dioxide Copolymers: Determination of the Crystal Structure of Stereocomplex Poly(limonene carbonate)

15.04.2015 | Finizia Auriemma; Claudio De Rosa; Maria Rosaria Di Caprio; Rocco Di Girolamo; Geoffrey W. Coates, Macromolecules, 2015

The crystal structure of the alternating copolymer of limonene epoxide and carbon dioxide has been studied. Highly stereoregular and regioregular alternating copolymers have been prepared starting from cis/trans mixtures of both enantiopure (R) and (S) isomers of ...

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Remarkable Effect of Molecular Architecture on Chain Exchange in Triblock Copolymer Micelles

10.04.2015 | Jie Lu; Frank S. Bates; Timothy P. Lodge, Macromolecules, 2015

The effect of polymer architecture on molecular exchange in block copolymer micelles has been investigated using time-resolved small-angle neutron scattering (TR-SANS). Narrowly dispersed symmetric PEP–PS–PEP and PS–PEP–PS triblock copolymers were synthesized, where PS and PEP refer to ...

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Donor–Acceptor Type Thioxanthones: Synthesis, Optical Properties, and Two-Photon Induced Polymerization

08.04.2015 | Rashid Nazir; Evaldas Balčiu̅nas; Dorota Buczyńska; Florent Bourquard; Dorota Kowalska; David Gray; Sebastian Maćkow ..., Macromolecules, 2015

A set of thioxanthone derivatives bearing strongly electron-donating dialkylamino groups have been synthesized efficiently via the Buchwald–Hartwig, Sonogashira, and Heck reactions. Compounds possessing both one and two donors have been prepared. Their optical properties proved to be intriguing. ...

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High Strength Chitosan Hydrogels with Biocompatibility via New Avenue Based on Constructing Nanofibrous Architecture

06.04.2015 | Jiangjiang Duan; Xichao Liang; Yan Cao; Sen Wang; Lina Zhang, Macromolecules, 2015

Breaking the limitation of traditional acid dissolving methods for chitosan by creating an alkali/urea hydrogen-bonded chitosan complex, a new solvent (4.5 wt % LiOH/7 wt % KOH/8 wt % urea aqueous solution) was used to successfully dissolve chitosan via the freezing–thawing process, for the first ...

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Room-Temperature Self-Healing Polymers Based on Dynamic-Covalent Boronic Esters

26.03.2015 | Jessica J. Cash; Tomohiro Kubo; Abhijeet P. Bapat; Brent S. Sumerlin, Macromolecules, 2015

Cross-linked polymers constructed with dynamic-covalent boronic esters were synthesized via photoinitiated radical thiol–ene click chemistry. Because the reversibility of the boronic ester cross-links was readily accessible, the resulting materials were capable of undergoing bond exchange to ...

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Multicomponent Tandem Reactions and Polymerizations of Alkynes, Carbonyl Chlorides, and Thiols

25.03.2015 | Chao Zheng; Haiqin Deng; Zujin Zhao; Anjun Qin; Rongrong Hu; Ben Zhong Tang, Macromolecules, 2015

Multicomponent tandem reactions (MCTRs), with multiple bonds formed in a highly concise fashion in a single vessel, have been noted as one of the most powerful and popular synthetic strategies in modern organic chemistry. Attracted by their operational simplicity, synthetic efficiency, high atom ...

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Amorphous Phase Modulus and Micro–Macro Scale Relationship in Polyethylene via in Situ SAXS and WAXS

19.03.2015 | Bijin Xiong; Olivier Lame; Jean-Marc Chenal; Cyrille Rochas; Roland Seguela; Gerard Vigier, Macromolecules, 2015

The small strain mechanical behavior of bulk polyethylene was investigated at the local scale of the lamella stackings by means of combined in situ SAXS and WAXS at different testing temperatures. Three different thermal treatments on four materials afforded studying a wide range of ...

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Local Molecular Dynamics and Heterogeneity in PEO–NiCl2 Supramolecular Networks

18.03.2015 | Hadi Goldansaz; Evelyne van Ruymbeke; Jean-François Gohy; Charles-André Fustin; Michael E. Ries; Christian Bailly, Macromolecules, 2015

The melt dynamics of poly(ethylene oxide) [PEO]–nickel chloride [NiCl2] systems are analyzed by proton NMR relaxometry and rheology. A consistent picture of the corresponding microstructure is proposed based on the combined results. Rheology reveals the presence of a weak gel due to PEO–metallic ...

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