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Effect of water state and polymer chain motion on the

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Wettability of polymer surfaces effects of chemistry

University of Massachusetts Amherst [email protected] Amherst Doctoral Dissertations 1896 - February 2014 1-1-2001 Wettability of polymer surfaces effects ofTrapping a Diradical Transition State by Mechanochemical Aug 27,2010 Effect of water state and polymer chain motion on the#0183;Transition state structures are central to the rates and outcomes of chemical reactions,but their fleeting existence often leaves their properties to be inferred rather than observed.By treating polybutadiene with a difluorocarbene source,we embedded gem- difluorocyclopropanes ( g DFCs) along the polymer backbone.We report that mechanochemical activation of the polymer under tensionThe Effects of Temperature Plastics TechnologyJul 27,2011 Effect of water state and polymer chain motion on the#0183;The more crystalline the polymer structure is,the smaller the modulus decline through Tg.It is important to emphasize that the Tg and the melting point (Tm) are fundamental properties for each polymer.We can reduce the effect that the Tg has on the elastic modulus of a semi-crystalline polymer by adding fillers and reinforcements.

The Effect of Surfactant Selection on Emulsion Polymer

Aug 01,2007 Effect of water state and polymer chain motion on the#0183;Above 4 EO moles,the polymer particle size increases rapidly.This increase in particle size is suggestive of a more predominant effect of the EO chain on the molecule.As the EO chain portion of the micelle increases,hydration increases,and theSome results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextDiffusion Coefficients of Water and Leachables in The free energy of mixing can be represented by the Flory interaction parameter,while the expansion of the network is related to the restriction of polymer chain motion by crosslinks.The formation of hydrogen bonds of the diffusing water with specific sites on the polymer network can also significantly influence the value of the diffusion and Some results are removed in response to a notice of local law requirement.For more information,please see here.12345NextTemperature-regulated flexibility of polymer chains in May 17,2019 Effect of water state and polymer chain motion on the#0183;A loose network containing short polymer chains with a high degree of segmental motion can facilitate the exchange of hydrogen bonds,thus

Some results are removed in response to a notice of local law requirement.For more information,please see here.Signature of hydrophobic hydration in a single polymer PNAS

Oct 04,2011 Effect of water state and polymer chain motion on the#0183;Single Polymer Force Plateau Marks Hydrophobic Hydration.Using AFM,a single polymer chain can be pulled from a naturally collapsed state to a hydrated,extended state as illustrated in Fig.2A.It has been predicted theoretically and shown in simulations that forced hydration of a collapsed hydrophobic polymer produces a constant force-distance profile.Signature of hydrophobic hydration in a single polymer PNASOct 04,2011 Effect of water state and polymer chain motion on the#0183;Single Polymer Force Plateau Marks Hydrophobic Hydration.Using AFM,a single polymer chain can be pulled from a naturally collapsed state to a hydrated,extended state as illustrated in Fig.2A.It has been predicted theoretically and shown in simulations that forced hydration of a collapsed hydrophobic polymer produces a constant force-distance profile.

Progress Report on Phase Separation in Polymer Solutions

This derivation is based on the consideration that a single polymerchain diffusion is engendered by Brownian motion of beads connected by harmonic springs.The Rouse mobility has been used by Chan 62 and Yang 63 to simulate phase separation in polymer solutions.The shortcoming of the Rouse model is ascribed to the neglect of hydrodynamic Progress Report on Phase Separation in Polymer Solutions This derivation is based on the consideration that a single polymerchain diffusion is engendered by Brownian motion of beads connected by harmonic springs.The Rouse mobility has been used by Chan 62 and Yang 63 to simulate phase separation in polymer solutions.The shortcoming of the Rouse model is ascribed to the neglect of hydrodynamic Polymer solutions - Soft-MatterOct 27,2008 Effect of water state and polymer chain motion on the#0183;1 Solvent effects; 2 Polymer self-interaction and solvent quality; 3 Solvent-polymer effects - The Flory 'Chi' parameter; 4 Electrostatic interactions - Bjerrum length and Debye length; 5 Repulsion between charges down a chain - 1st model; 6 Repulsion from charges down a chain - 2nd model; 7 Overlap concentration - c*; 8 Semi-dilute regime - The interaction of blobs; 9 Correlation

Polymer Rheology - Department of Physics

The other extreme of this state is when small amounts of a polymer is added as an additive (solute) to a solvent.This state is called the dilute solution.This is very similar to putting one polymer chain in a sea of solvent.It is equivalent to one polymer because the solution is so dilute that the motion of one polymer does not inuence Polyacrylamide degradation and its - npj Clean WaterSep 07,2018 Effect of water state and polymer chain motion on the#0183;Chemical degradation of PAM that leads to chain scission involves activation of the polymer by free radicals,42,62,63,64,65,66 most commonly hydroxyl radicals generated in the environment from Playing with Polymers - Scientific AmericanJan 05,2012 Effect of water state and polymer chain motion on the#0183;You can make a polymer-based material similar to Silly Putty at home by mixing together water,borax and Elmer's Glue.Elmer's is made up of polyvinyl acetate,which is a synthetic polymer.

Playing with Polymers - Scientific American

Jan 05,2012 Effect of water state and polymer chain motion on the#0183;You can make a polymer-based material similar to Silly Putty at home by mixing together water,borax and Elmer's Glue.Elmer's is made up of polyvinyl acetate,which is a synthetic polymer.Physical Properties of Polymers Textile Study CenterMay 11,2018 Effect of water state and polymer chain motion on the#0183;Physical Properties of Polymers Polymer The dispersity measures heterogeneity of sizes of molecules or particles in the mix-ture.The mixture is called monodisperse if the molecules have the same size,shape,or mass.If the molecules in the mixture have an inconsistent size,shape and mass distri-bution,the mixture is called polydisperse..The natural polymers are generally monodisperse as POLYMERSsolvents that will dissolve short-chain molecules with chemical structures similar to those of the polymer.If the intermolecular forces between the chains are sufficiently strong to prevent motion of the molecules past one another the polymer will be solid at room temperature,but will usually lose strength and

Liquid water is a dynamic polydisperse branched polymer PNAS

In contrast to ice,in which each water makes strong hydrogen bonds (SHBs) to four neighbors,we show that upon melting the number of SHBs drops quickly to two in liquid water.These two SHBs couple into chains containing 150 waters resembling a branched polymer.The lifetime of each SHB at 298 K is 90.3 fs (11 OH vibrational periods),so the polymer branches evolve dynamically.Liquid water is a dynamic polydisperse branched polymer PNASIn contrast to ice,in which each water makes strong hydrogen bonds (SHBs) to four neighbors,we show that upon melting the number of SHBs drops quickly to two in liquid water.These two SHBs couple into chains containing 150 waters resembling a branched polymer.The lifetime of each SHB at 298 K is 90.3 fs (11 OH vibrational periods),so the polymer branches evolve dynamically.Heterogeneous Solvent Dielectric Relaxation in Polymer Apr 15,2020 Effect of water state and polymer chain motion on the#0183;The dynamics of polymer solutions are heterogeneous.The different molecule sizes and structures cause different mobilities of polymers and solvents.Recently,regarding the heterogeneity of water,two dielectric relaxation processes of water were argued in several supercooled polymerwater mixtures.To investigate whether this is unique to water,we performed broadband dielectric

Glass transition temperature Basics and ticle application

On addition of plasticizer to polymer,plasticizer gets in between the polymer chains and spaces them apart from each other increasing the free volume.[2] This results in polymer chains sliding past each other more easily.As a result,the polymer chains can move around at lower temperatures resulting in decrease in Tg of a polymer[2,13,21-23]Glass transition temperature Basics and ticle application On addition of plasticizer to polymer,plasticizer gets in between the polymer chains and spaces them apart from each other increasing the free volume.[2] This results in polymer chains sliding past each other more easily.As a result,the polymer chains can move around at lower temperatures resulting in decrease in Tg of a polymer[2,13,21-23]Food Packaging Permeability Behaviour A ReportMoreover,the experiments showed that the effect of the aqueous solutions on polymer permeability is similar to that produced by the temperature increments the increase permeability with the temperature is mostly due to the enhanced motion of the polymer chain and to an increased energy level of permeating molecules .

Effect of water state and polymer chain motion on the

Effect of water state and polymer chain motion on the mechanical properties of a bacterial cellulose and polyvinyl alcohol (BC/PVA) hydrogel Lifeng Li ,ab Li Ren ,* b Lin Wang ,ab Sa Liu ,ab Yongrou Zhang ,c Liqun Tang c and Yingjun Wang * aDiffusive properties of solvent molecules in the The second state relates to so called bound solvent.In this case the solvent diffusivity decreases with polymer content.For diluted solutions the diffusion of bound solvent is affected by polymer chain length,precisely,by the ability of the polymer chain to undergo coil formation.Diffusion Coefficients of Water and Leachables in The free energy of mixing can be represented by the Flory interaction parameter,while the expansion of the network is related to the restriction of polymer chain motion by crosslinks.The formation of hydrogen bonds of the diffusing water with specific sites on the polymer network can also significantly influence the value of the diffusion and

Dielectric Relaxation Spectroscopy in Synthetic Rubber

DRS is very sensitive to polymer chain motion attributed to primary and secondary relaxation processes,called -,-,and -relaxation,respectively.Furthermore,the MaxwellWagnerSillars (MWS) relaxation phenomena,which are the signals of the interfacial polarization process of heterogeneous polymers,are only detected through DRS Cited by 7Publish Year 2017Author Elias Mahmoudinezhad,Axel Marquardt,Gunther Eggeler,Fathollah VarnikEffect of LiClO4 on the Structure and Mobility of PEO The relationship between structure,PEO mobility,and ionic conductivity is investigated for the solid polymer electrolyte,PEO/LiClO4.Amorphous and semicrystalline samples with ether-oxygen-to-lithium ratios ranging from 4:1 to 100:1 are measured.Previous X-ray diffraction results show that three crystalline phases can form in this system depending on the LiClO4 concentration (PEO)3:LiClO4 Cited by 3Publish Year 2015Author Wei Shao,Huanli Dong,Zhigang Wang,Wenping HuTemperature-regulated flexibility of polymer chains in May 17,2019 Effect of water state and polymer chain motion on the#0183;A loose network containing short polymer chains with a high degree of segmental motion can facilitate the exchange of hydrogen bonds,thus

Cited by 1Publish Year 2019Author Rui Chen,Xiubin Xu,Danfeng Yu,Minhuan Liu,Chuanghong Xiao,Ian Wyman,Zhengping Wang,Hui Yang,Molecular dynamics simulations of entangled polymers The

Jan 01,2017 Effect of water state and polymer chain motion on the#0183;The work is motivated by the need to better understand the effect of environmental conditions on polymer properties.Due to glassy nature of the polymers,special care is needed to prepare well-equilibrated samples and to obtain reliable data.Our central result indicates a softening of the polymer by small molecules.Cited by 175Publish Year 1993Author Jie Shi,Colin A.VincentTouching polymer chains by organic field-effect Sep 17,2014 Effect of water state and polymer chain motion on the#0183;Organic field-effect transistors (OFETs) are used to directly touch the movement and dynamics of polymer chains and then determine Tg.As aCited by 15Publish Year 2015Author Lifeng Li,Li Ren,Lin Wang,Sa Liu,Yongrou Zhang,Liqun Tang,Yingjun WangThe effect of molecular weight on cation mobility in Mar 01,1993 Effect of water state and polymer chain motion on the#0183;Transport of cations in a polymer electrolyte is controlled by the dynamic relaxational modes of the host polymer.For high molecular weight systems,it has been established that the most probable mechanism involves short-range segmental motion of the polymer chains together with occasional transfer of coordinated cations from one polymer strand to another.

Adhesion and Friction Mechanisms of Polymer-on-Polymer

Jul 19,2002 Effect of water state and polymer chain motion on the#0183;The adhesion and friction of smooth polymer surfaces were studied below the glass transition temperature by use of a surface forces apparatus.The friction force of a crosslinked polymer was orders of magnitude less than that of an uncrosslinked polymer.In contrast,after chain scission of the outermost layers,the adhesion hysteresis and friction forces increase substantially.Adhesion and Friction Mechanisms of Polymer-on-Polymer Jul 19,2002 Effect of water state and polymer chain motion on the#0183;The adhesion and friction of smooth polymer surfaces were studied below the glass transition temperature by use of a surface forces apparatus.The friction force of a crosslinked polymer was orders of magnitude less than that of an uncrosslinked polymer.In contrast,after chain scission of the outermost layers,the adhesion hysteresis and friction forces increase substantially.

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