Intrinsic Viscosity Determination of High Molecular Weight Biopolymers by Different Plot Methods. Chia Gum Case

Masuelli, Martin Alberto

doi:10.12691/jpbpc-6-1-2

Cited by 20 publications

(18 citation statements)

References 34 publications

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“…Masuelli [43] measured the intrinsic viscosity of aqueous PVA solutions (molecular weight of 46 500 g/mol) in the temperature range of 25-60 C. The calculated values of the MHS parameters were similar to those published by Misra and Mukherjee. [44] He reported that the conformation of PVA chains in an aqueous solution was that of a random coil, and postulated that when the temperature increases, the PVA polymer chains undergo an expansion.…”

Section: Viscosity Of Aqueous Pva Solutionssupporting

confidence: 76%

“…The effect of the molecular weight of PVA on its intrinsic viscosity was recently studied by Lămătic et al [ 41 ] They obtained the following Mark–Houwink–Sakurada (MHS) equation showing the dependency of the intrinsic viscosity on the molecular weight of PVA in aqueous solutions at 30°C (in dl/g):

([], η) = 1.38 normalx 10^{- 3} M^{0.56}

For syndiotactic‐rich PVA samples with molecular weights in the range 3.5 × 10 4 –12.5 × 10 4 g/mol, Yamaura et al [ 42 ] reported the following equation for the intrinsic viscosity of aqueous PVA solutions and its dependence on molecular weight (in dl/g):

([], η) = 0.73 4 normalx 10^{- 3} M^{0.63}

Masuelli [ 43 ] measured the intrinsic viscosity of aqueous PVA solutions (molecular weight of 46 500 g/mol) in the temperature range of 25–60°C. The calculated values of the MHS parameters were similar to those published by Misra and Mukherjee.…”

Section: Calculation Of Suspension Viscositymentioning

confidence: 99%

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On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

Kiparissides

Pladis

2021

Can J Chem Eng

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The role of primary and secondary stabilizers in the suspension polymerization of VCM and their effect on grain morphology (i.e., particle size distribution, grain porosity, and bulk density) is critically discussed. Using the modified Mooney equation, the time‐varying viscosity of the suspension in an SPVC reactor is calculated in terms of the volume fraction of the dispersed monomer/polymer phase, the ratio of the viscosity of the dispersed phase over the viscosity of the continuous aqueous phase, and the maximum packing volume fraction of SPVC grains. A population balance equation is numerically solved to calculate the dynamic evolution of particle size distribution (PSD) in an industrial batch suspension VCM polymerization reactor. A porosity model is postulated to calculate the dynamic evolution of the PVC grain porosity with respect to monomer conversion and the extent of primary particle fusion. Finally, the underlying theory regarding the calculation of the required agitation power in SPVC reactors is detailed. It is shown that the time‐varying viscosity of the suspension can be calculated and the PVC grain morphology (i.e., extent of particle agglomeration) can be accessed via the on‐line estimation of the effective volume fraction of the dispersed phase using on‐line power agitation measurements obtained from an industrial‐scale SPVC reactor.

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Section: Viscosity Of Aqueous Pva Solutionssupporting

confidence: 76%

([], η) = 1.38 normalx 10^{- 3} M^{0.56}

([], η) = 0.73 4 normalx 10^{- 3} M^{0.63}

Section: Calculation Of Suspension Viscositymentioning

confidence: 99%

On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

Kiparissides

Pladis

2021

Can J Chem Eng

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“…Oseltamivir is suitable for use in diverse patient populations, which may include young children and elderly patients, various ethnic groups and those with renal or hepatic impairment (Brian and Davies, 2010). Now a day's Ultrasonic investigations is employed in a wide range of applications in medicine, biology, industry, material science, agriculture, oceanography, sonochemistry due to its non-destructive nature (Blitz, 1963; Suslick, 1988; Mason, 1990; Naik et al., 2015; Carncim et al., 1999; Kruger et al., 1999; Masuelli, 2018). Polymers are one of the most essential products which ambiances us in every gait of life HPMC is a polysaccharide prepared from cellulose (Arumugam et al., 1998).…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical studies on binary aqueous solutions of Anti-Viral Influenza drugs

Punitha¹,

Uvarani

Panneerselvam³

et al. 2019

Heliyon

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The ultrasonic velocity, density, viscosity and absorption have been measured for solution of Influenza Anti-Viral drugs (Amantadine and Oseltamivir) are presented at room temperature 303K. By taking measurements of Anti Influenza Viral drugs at 0.2, 0.4 and 0.6% concentrations of each solution. The aim of the study is to increase the solubility, stability, sweetness of drugs by the formation of complexation. The ultrasonic velocity, density and viscosity have been measured at 2MHz for the aqueous solutions of (i) Influenza Anti-Viral Drugs + HPMC (Hydroxy Propyl Methyl Cellulose), Lactose and CaCl 2 (Calcium Chloride at different concentrations at a temperature 303K.The acoustical parameters such as adiabatic compressibility (β), intermolecular free length (L f ), internal pressure (π i ), Rao's constant (R), relaxation time (τ), acoustical impedance (Z a ), absorption coefficient (α/f 2 ), free volume (V f ), cohesive energy and solvation number (Sn) have been computed. These properties are attributed to solute-solvent interactions through hydrogen bonding, segment-segment interaction, molecular association, polymer-solvent interaction, polymer-polymer interaction and etc. The total absorption can be considered as the sum of contributions from solute-solvent interactions. These results are further supported by FTIR studies.

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“…Long polymer chains of the same degree of polymerization do not “balled-up” in the same way. 69, 72 Thus, although it seems like 100% rejection should be observed for these molecules with number-average sizes well above the dimensions of OmpF’s constriction zone, the membrane could be defective or there could be polymer chains possessing lengths, and consequently radii, significantly smaller than the average.…”

Section: Resultsmentioning

confidence: 99%

Layer-by-layer assembled membranes with immobilized porins

et al. 2017

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With the synthesis and functionalization of membranes for selective separations, reactivity, and stimuli responsive behavior arises new and advanced opportunities. The integration of bio-based channels is one of these advancements in membrane technologies. By a layer-by-layer (LbL) assembly of polyelectrolytes, outer membrane protein F trimers (OmpF) or “porins” from Escherichia coli with a central pore of ~2 nm diameter at its opening and ~0.7 × 1.1 nm at its constricted region are immobilized within the pores of poly(vinylidene fluoride) microfiltration membranes, as opposed to traditional ruptured lipid bilayer or vesicles processes. These OmpF-membranes demonstrate selective rejections of non-charged organics over ionic solutes, allowing the passage of salts up to 2 times higher than traditional nanofiltration membranes starting with rejections of 84% for 0.4–1.0 kDa organics. The presence of charged groups in OmpF membranes also leads to pH-dependent salt rejection through Donnan exclusion. These OmpF-membranes also show exceptional durability and stability, delivering consistent and constant permeability and recovery for over 160 h of operation. Characterization of solutions containing OmpF, and membranes were conducted during each stage of the process, including detection by fluorescence labelling (FITC), zeta potential, pH responsiveness, flux changes, and rejections of organic-inorganic solutions.

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Intrinsic Viscosity Determination of High Molecular Weight Biopolymers by Different Plot Methods. Chia Gum Case

Cited by 20 publications

References 34 publications

On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

On the prediction of suspension viscosity, grain morphology, and agitation power in SPVC reactors

Physico-chemical studies on binary aqueous solutions of Anti-Viral Influenza drugs

Layer-by-layer assembled membranes with immobilized porins

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