Determination of the absolute molecular weight of a styrene–butyl acrylate emulsion copolymer by low‐angle laser light scattering (LALLS) and GPC/LALLS

Malihi, Farrokh B.; Kuo, Cheng-Yih; Provder, Theodore

doi:10.1002/app.1984.070290320

Cited by 20 publications

(4 citation statements)

References 6 publications

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“…Figure 3 shows the resultant curve modeled from eq. (19) with p' = 14.65 and q' = -1.037 for amylose (solid line) in 0.5N NaOH aqueous solution. Similar data for dextran and NaPSS are shown, respectively, by open circles and open squares in Figure 3 using the same SEC/LALLS system.…”

Section: Resultsmentioning

confidence: 99%

Low‐angle laser light scattering–aqueous size exclusion chromatography of polysaccharides: Molecular weight distribution and polymer branching determination

Rollings

1987

J of Applied Polymer Sci

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SynopsisA low-angle laser light scattering detector (LALLS) used with size exclusion chromatography (SEC/LALLS) has been applied for the determination of molecular weight, molecular weight distribution (MWD), and degree of branching of polysaccharides in 0.5N NaOH aqueous solution. Data from both detectors [differential refractive index (DRI) and LALLS] are used to calculate the absolute molecular weight at each point in a sample chromatogram. The correct average molecular weight and MWD can be obtained without calibration methods used in conventional SEC. As a consequence of this technique, Mark-Houwink coefficients can be predicted from a single broad-distribution, homopolymer without recourse to timeconsuming fractionation methods. Moreover, the hydrodynamic volume separation mechanism of SEC can be exploited with the SEC/LALLS method to gain information about polymer branching. In the studies described in this paper, SEC/LALLS has been employed to obtain data about the branching parameters g, and g , , , for samples of amylose, amylopectin, starch, and glycogen. For three homopolymers (amylose, amylopectin, and glycogen), branching frequency (as measured by chemical means), and the branching parameters (go and gM) are inversely related. This trend is consistent with theoretical predictions. For starch, a nonhomogeneous branching distribution is observed as a function of molecular weight.

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Section: Resultsmentioning

confidence: 99%

Low‐angle laser light scattering–aqueous size exclusion chromatography of polysaccharides: Molecular weight distribution and polymer branching determination

Rollings

1987

J of Applied Polymer Sci

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“…Another emulsion study was performed by Devon and Rudin (1986) to elucidate the chain transfer to monomer constant for the copolymer system. Llauro-Darricades et al (1986) studied the copolymer microstructure using I3c nuclear magnetic resonance spectroscopy ( I3C-NMR), and Malihi et al (1984) the molecular weight in different solvents with a lowangle laser light scattering photometer (LALLSP) and gel permeation chromatography (GPC). Reports on the system's reactivity ratios can also be found in Arlman and Melville (1950), Mangaraj and Rath (1972), and Hamaide et al (1984).…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

A kinetic investigation of styrene/butyl acrylate copolymerization

1990

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An experimental investigation of the kinetics of the bulk free radical copolymerization of styrendbutyl acrylate initiated with 2.2 '-azobisisobutyronitrile (ABN) was conducted at 50°C using various initiator concentrations and initial monomer ratios including the azeotropic composition.Reactivity ratios were determined by analyzing composition data using the error-in-variables model. The experiments, designed using the Tidwell-Mortimer criterion, were conducted in sealed ampoules at 50°C to low conversion levels From the calculated reactivity ratios, the azeotropic composition was determined and further experiments were run at these conditions as well as at two other initial monomer feed compositions in order to collect composition, rate and molecular weight data. The experiments were run through the full conversion range at two different initiator concentrations.( < 7%).Une recherche expirimentale sur la cinCtique de la copolymerisation a radical libre en vrac du styritne/acrylate de butyle amorcC avec du 2,2 '-azobisisobutyronitrile (AIBN), a Ct C menCe a 50°C avec diverses concentrations d'initiateur et divers rapports de monomkres initiaux, incluant la composition azkotropique.On a determine les rapports de rCactivitC en analysant les donnCes de composition a I'aide du moditle d'erreurs. Les exptriences, mises au point partir du critkre de Tidwell-Mortimer, ont CtC menees dans des ampoules Ctanches 50°C pour de faibles taux de conversion ( < 7%).On a dttermint a partir de rapports de rCactivitC calculCs la composition azCotropique, et de nouvelles experiences ont @tC effectuCes dans ces conditions ainsi qu'i deux autres compositions d'alimentation en monomkres afin d'obtenir des donnCes de composition, de vitesse et de poids moleculaire. Les experiences ont ete menCes dans la gamme de conversion totale a deux concentrations en initiateur diffkrentes.

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“…[ 50 ] Similarly, the d n /d c for poly(n‐decyl methacrylate) and poly(n‐butyl acrylate) are 0.076 and 0.067 ml g −1 , respectively. [ 51,52 ] As the d n /d c values were almost in the same range, we assumed an equal d n /d c value for GPC peaks to measure conversion. The calculated conversions corresponded very well with the conversions determined by gravimetry or 1 H NMR (not reported here).…”

Section: Methodsmentioning

confidence: 99%

Nitroxide mediated miniemulsion polymerization of methacryloisobutyl POSS: Homopolymers and copolymers with alkyl methacrylates

Tajbakhsh

Marić

2020

Journal of Polymer Science

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Nitroxide mediated polymerization (NMP) of methacryloisobutyl POSS (POSSMA) was conducted in a dispersed aqueous miniemulsion at 90 C, resulting in stable latexes with particle sizes = 225-260 nm at solids loading = 22%. POSSMA homopolymers with M n up to 35.9 kg mol −1 (Đ < 1.53) was prepared using Dispolreg 007 alkoxyamine without any controlling comonomers, as is traditionally required for NMP of methacrylates. Copolymers with different ratios of POSSMA and bio-based C13 methacrylic esters were also synthesized (monomer conversion [X] up to 96.5% and 1.42 < Đ < 1.68) to prepare polymer resins with a wide range of glass transition temperatures (T g) or melting points (T m) (−30 C < T g , T m < 96 C). The resulting homopolymers and copolymers exhibited semi-crystalline properties, with crystallite size of 20.3-44.4 Å.

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Determination of the absolute molecular weight of a styrene–butyl acrylate emulsion copolymer by low‐angle laser light scattering (LALLS) and GPC/LALLS

Cited by 20 publications

References 6 publications

Low‐angle laser light scattering–aqueous size exclusion chromatography of polysaccharides: Molecular weight distribution and polymer branching determination

Low‐angle laser light scattering–aqueous size exclusion chromatography of polysaccharides: Molecular weight distribution and polymer branching determination

A kinetic investigation of styrene/butyl acrylate copolymerization

Nitroxide mediated miniemulsion polymerization of methacryloisobutyl POSS: Homopolymers and copolymers with alkyl methacrylates

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