Specific volume of polymer
WebJul 16, 2008 · A universal approach for the calculation of both low-molecular organic compounds and polymers of different chemical composition and structure in aqueous solution is described. It is based on volume increments for the constituent atoms, ions and/or groups and allows corrections for covolume, ring formation, micellization, … WebDec 1, 2024 · Simplifying assumptions have been made to generalize these equations and make them more usable: 1) molar refractions are treated as constants, 2) the density of the polymer solution, in the limit of low polymer concentration, can be approximated via the additivity of volumes approach; the densities of polymer-free solvents and solvent …
Specific volume of polymer
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WebNov 1, 2024 · Illustrative plots of specific volume vs. temperature are shown at the right for amorphous and crystalline polymers. Glass Transition Temperature When an amorphous … WebThe interfacial area generates a significant volume fraction of interfacial polymer, with properties different from the bulk polymer even at low loadings of the nanofiller. This review aims to provide specific guidelines on the correlations between the structures of TiO 2 nanocomposites with polymeric matrix and their mechanical properties.
WebSpecific volume in crystalline polymers When a crystalline polymer is heated from the solid state it will expand at a constant rate dependent on its coefficient of thermal expansion. At the melting point the polymer undergoes a large increase in volume before once again expanding at a constant rate in the liquid state. WebOct 18, 2024 · To compute for free volume of polymer, two essential parameters are needed and these parameters are specific volume (V) and volume of solidly packed molecules (V …
WebFFV, can be calculated from the well-known empirical equation: FFV = 1 V o /V s, where V o = 1.3V w, V s is the specific volume, V o the occupied volume of polymer, and V w is the van der Wallss volume of polymer that is multiplied by 1.3, based on the packing density of a molecular crystal at 0K. WebJun 21, 2016 · We find that the density (specific volume) of these supported PS films does not vary by more than ±0.4% of the bulk value for film thicknesses above 30 nm, and that the small variations we do observe are uncorrelated with any free volume explanation for the Tg(h) decrease exhibited by these films.
Specific volume is a property of materials, defined as the number of cubic meters occupied by one kilogram of a particular substance. The standard unit is the meter cubed per kilogram (m 3 /kg or m 3 ·kg −1 ). Sometimes specific volume is expressed in terms of the number of cubic centimeters occupied by one … See more In thermodynamics, the specific volume of a substance (symbol: ν, nu) is an intrinsic property of the substance, defined as the ratio of the substance's volume (V) to its mass (m). It is the reciprocal of density ρ (rho) … See more The specific volume of a non-ideal solution is the sum of the partial specific volumes of the components: M is the molar mass … See more Specific volume is commonly applied to: • Molar volume • Volume (thermodynamics) • Partial molar volume See more If one sets out to determine the specific volume of an ideal gas, such as super heated steam, using the equation ν = RT/P, where pressure is … See more
WebApr 26, 2024 · Specific volume vs Temperature curve with Tg and Tm for amorphous and semi-crystalline polymer. Fig. shows the decrease of specific volume with temperature for amorphous and semi-crystalline polymers. bioforce 9000 spare partsWebThe molar volume (Vm) of a polymer is defined as the volume occupied by the polymer molecules in units of volume per mole at a given temperature and pressure, and the … bioforce abidjanWebJun 21, 2016 · We find that the density (specific volume) of these supported PS films does not vary by more than ±0.4% of the bulk value for film thicknesses above 30 nm, and that … bioforce admissionWebMar 4, 2006 · Specific volume=.94 x (OD2-ID2) x OD/1000 SV is denoted in cc/diameter of length (it?s always best to obtain SV data from the machine supplier, if possible), OD=Screw outside diameter (each), ID=Screw inside diameter (each). For example: For a HSEI twin-screw extruder with a screw OD of 50 and an ID of 32 the SV is as follows: bioforce 9000WebThe value depends on the mobility of the polymer chain. The Tg for most synthetic polymers lies between 170K to 500K. Which type of polymers undergo glass transition? Polymers are made up of long chains of molecules. Tg depends on the chemical structure of the polymer defined by its crystallinity. bioforce ag switzerlandWebDec 23, 2015 · The value of V f can be calculated using Bondi formula V f = V sp – V oc, where V oc is the occupied volume, and it can be estimated as V oc = 1.3 V w, where V w … bioforce animal healthWebSep 12, 2024 · The dispersity of a polymer sample if often between 1 and 2 (although it can be even higher than 2). The closer it is to 1, the narrower the distribution. That is, a … daikin commercial air conditioning