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673 Aktuelle Fachpublikationen zum Thema temperature

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Rehydration of Thermoresponsive Poly(monomethoxydiethylene glycol acrylate) Films Probed in Situ by Real-Time Neutron Reflectivity

22.05.2015 | Qi Zhong; Ezzeldin Metwalli; Monika Rawolle; Gunar Kaune; Achille M. Bivigou-Koumba; André Laschewsky; Christine M. ..., Macromolecules, 2015

The rehydration of thermoresponsive poly(monomethoxydiethylene glycol acrylate) (PMDEGA) films exhibiting a lower critical solution temperature (LCST) type demixing phase transition in aqueous environments, induced by a decrease in temperature, is investigated in situ with real-time neutron ...

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Controllable Synthesis of Stereoregular Polyesters by Organocatalytic Alternating Copolymerizations of Cyclohexene Oxide and Norbornene Anhydrides

22.05.2015 | Bing Han; Li Zhang; Binyuan Liu; Xiaofang Dong; Il Kim; Zhongyu Duan; Patrick Theato, Macromolecules, 2015

A facile strategy has been demonstrated for the selective synthesis of highly stereoregular polyesters with cis-2,3-(exo, exo) or trans-2,3-(exo, endo) repeating units by the organocatalysts mediated alternating copolymerization of cyclohexene oxide and norbornene anhydride (NA) stereoisomers. ...

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Transient Metallosupramolecular Networks Built from Entangled Melts of Poly(ethylene oxide)

21.05.2015 | Hadi Goldansaz; Dietmar Auhl; Bart Goderis; Quentin Voleppe; Charles-André Fustin; Jean-François Gohy; Christian Bai ..., Macromolecules, 2015

The effect of poly(ethylene oxide) [PEO]–metal salt complexation on the dynamics and microstructure of PEO–nickel chloride [NiCl2] systems is investigated by rheology and X-ray scattering. Annealed PEO–nickel salt systems exhibit network properties above the melting temperature of PEO, ...

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Shape-Memory Polymers with Adjustable High Glass Transition Temperatures

21.05.2015 | Xinli Xiao; Deyan Kong; Xueying Qiu; Wenbo Zhang; Fenghua Zhang; Liwu Liu; Yanju Liu; Shen Zhang; Yang Hu; Jinsong Leng, Macromolecules, 2015

Shape-memory polymers (SMPs) are synthesized with adjustable glass transition temperature (Tg) ranging from 299 to 322 °C, higher than those reported previously. The polyimide containing thermal stable but flexible linkages within the backbone act as reversible phase, and high molecular weight ...

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Tunable Encapsulation Structure of Block Copolymer Coated Single-Walled Carbon Nanotubes in Aqueous Solution

15.05.2015 | Youngkyu Han; Suk-kyun Ahn; Zhe Zhang; Gregory S. Smith; Changwoo Do, Macromolecules, 2015

Nanosized and shape-tunable molecular building blocks can provide great opportunities for the fabrication of precisely controlled nanostructures. In this work, we have fabricated a molecular building block of single-walled carbon nanotubes (SWNTs) coated by PPO–PEO–PPO block copolymers whose ...

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An Eco-Friendly Scheme for the Cross-Linked Polybutadiene Elastomer via Thiol–Ene and Diels–Alder Click Chemistry

15.05.2015 | Jing Bai; Hui Li; Zixing Shi; Jie Yin, Macromolecules, 2015

We reported a novel method of producing the cross-linked polybutadiene elastomer which could be thermally recycled like the plastic materials without the sacrifice of functional utility. The commercial polybutadiene was first attached with furan via thiol–ene reaction, and the cross-linked ...

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Effects of o-Methoxy Groups on the Properties and Thermal Stability of Renewable High-Temperature Cyanate Ester Resins

14.05.2015 | Benjamin G. Harvey; Andrew J. Guenthner; William W. Lai; Heather A. Meylemans; Matthew C. Davis; Lee R. Cambrea; Jos ..., Macromolecules, 2015

Renewable phenols derived from biomass sources often contain methoxy groups that alter the properties of derivative polymers. To evaluate the impact of o-methoxy groups on the performance characteristics of cyanate ester resins, three bisphenols derived from the renewable phenol creosol were ...

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Controlled/Living Ring-Opening Polymerization of Glycidylamine Derivatives Using t-Bu-P4/Alcohol Initiating System Leading to Polyethers with Pendant Primary, Secondary, and Tertiary Amino Groups

14.05.2015 | Takuya Isono; Shunsuke Asai; Yusuke Satoh; Toshimitsu Takaoka; Kenji Tajima; Toyoji Kakuchi; Toshifumi Satoh, Macromolecules, 2015

The combination of t-Bu-P4 and alcohol was found to be an excellent catalytic system for the controlled/living ring-opening polymerization (ROP) of N,N-disubstituted glycidylamine derivatives, such as N,N-dibenzylglycidylamine (DBGA), N-benzyl-N-methylglycidylamine, N-glycidylmorpholine, and ...

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Improved Synthesis of Linear Poly(ethylenimine) via Low-Temperature Polymerization of 2-Isopropyl-2-oxazoline in Chlorobenzene

14.05.2015 | Bryn D. Monnery; Sunil Shaunak; Maya Thanou; Joachim H. G. Steinke, Macromolecules, 2015

Linear poly(ethylenimine) is a cationic polymer that is actively being progressed into clinical trials for gene therapy. The existing synthetic methodology produces a relatively broad distribution of molecular weights. We describe an improved method of polymerizing 2-alkyl-2-oxazolines as a route ...

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Multiresponsive Star-Graft Quarterpolymer Monolayers

12.05.2015 | Weinan Xu; Petr A. Ledin; Zacharoula Iatridi; Constantinos Tsitsilianis; Vladimir V. Tsukruk, Macromolecules, 2015

Multifunctional star-graft quarterpolymers PSn[P2VP-b-(PAA-g-PNIPAM)]n with two different arm types, shorter PS arms and longer P2VP-b-PAA block copolymer arms with grafted PNIPAM chains, were studied in terms of their ability to form micellar structures at the air/water and air/solid interfaces. ...

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