Effect of tacticity on the transition behaviour of poly(methyl methacrylate)/poly(vinyl chloride) blends. Thermally stimulated depolarization study

Vanderschueren, J.; Janssens, Ann; Ladang, M.; Niézette, J.

doi:10.1016/0032-3861(82)90342-1

Cited by 34 publications

(14 citation statements)

References 11 publications

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“…For the systems SAN/PMMA and PVC/PS, in which c and b show similar trends, there are no intermolecular interactions between the chains of the constituent polymers of the blends as reported earlier. 10 In such cases, the free volume generated in the system is solely due to the molecular arrangements and orientations, whereas in the case of the PMMA/PVC system, there exists an intermolecular interaction between the carbonyl group of PMMA and a-hydrogen of PVC, 12,13 and this interaction governs the molecular arrangement in the system. Therefore, in this system, both the free volume and c are influenced by the interaction.…”

Section: New Model For Miscibility Determinationmentioning

confidence: 97%

“…To check the efficacy of this generalization, we have carefully selected three blend systems; each one is an example of the three known varieties of blends: miscible blends, partially miscible blends, and immiscible blends. The three selected blend systems are styrene acrylonitrile (SAN)/poly(methyl methacrylate) (PMMA), PMMA/ poly(vinyl chloride) (PVC), and PVC/polystyrene (PS), of which the first one is miscible, 10,11 the second is partially miscible, 12,13 and the third is immiscible. 2 Because of its conceptual simplicity, free volume theory is widely used in polymer science for understanding many polymer properties at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

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New method of determining miscibility in binary polymer blends through hydrodynamic interaction: The free volume approach

Ranganathaiah

Kumaraswamy

2008

J of Applied Polymer Sci

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A new method has been developed to determine the probability of miscibility in binary polymer blends through hydrodynamic interaction. This is achieved by the measurement of the free volume content in blends of carefully selected systems-styrene acrylonitrile (SAN)/ poly(methyl methacrylate) (PMMA), PMMA/poly(vinyl chloride) (PVC), and PVC/polystyrene (PS)-with positron annihilation lifetime spectroscopy. The free volume content can predict the miscible/immiscible nature of the blends but provides no information on the extent of miscibility for different compositions of the blends. We have generalized a model used to understand the viscometric behavior of polymer/solvent systems to polymer/polymer systems through the free volume approach. This model provides two important parameters: a geometric factor (c) and a hydrodynamic interaction parameter (a). c depends on the molecular architecture, whereas a accounts for the excess friction at the interface between the constituents of the blend, and we propose that a can serve as a precursor to miscibility in a system and indicate which composition produces a high probability of miscibility. The efficacy of this proposition has been checked with measured free volume data for the three blend systems. The SAN/PMMA system produces a maximum a value of À209 at 20% PMMA; PVC/PMMA produces a maximum a value of À57 at 10% PMMA. Interestingly, for the PS/PVC system, a is close to zero throughout the entire concentration range. Therefore, we infer that a is perhaps an appropriate parameter for determining the composition-dependent probability of miscibility in binary blend systems.

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Section: New Model For Miscibility Determinationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

New method of determining miscibility in binary polymer blends through hydrodynamic interaction: The free volume approach

Ranganathaiah

Kumaraswamy

2008

J of Applied Polymer Sci

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“…Khare and Jain [249,250] found that the location of the DRS peak is comparable with that of the α-peak in TSDC spectra of acrylicacid-doped ethyl cellulose. Localization of side groups, the effects of polymer length, tacticity and polymerization degree can be analysed from the TSDC data accompanied by investigations with thermal analysis techniques [251][252][253][254][255].…”

Section: Relaxation Phenomena In Polymersmentioning

confidence: 99%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

134

167

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“…Schurer et al [9] who studied this system using Differential Scanning Calorimetry (DSC), DMA, and turbidity measurements concluded the system as miscible in low PMMA concentrations (less than 40 wt%). Later, Vanderschueren et al [10] studied the same system using Thermally Stimulated Depolarization Currents method and concluded that the miscibility range of this system was less than 10 wt% of PMMA. Interestingly, few other groups have reported this system to be miscible throughout the composition range [11,12].…”

Section: Introductionmentioning

confidence: 99%

Free volume microprobe studies on poly(methyl methacrylate)/poly(vinyl chloride) and poly(vinyl chloride)/polystyrene blends

Kumaraswamy

Ranganathaiah

2006

Polymer Engineering & Sci

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Blends of Poly(methyl methacrylate) (PMMA)/Poly(vinyl chloride) (PVC) and Poly(vinyl chloride) (PVC)/Polystyrene (PS) of different compositions were prepared by solution casting technique. The blends were characterized using Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), and Positron Lifetime Spectroscopy. DSC data were found to be inadequate to describe whether PMMA/PVC blends are miscible or not, possibly because of the small gap in their glass transition temperatures. On the other hand, PVC/PS blends were clearly found to be immiscible by DSC. FTIR results for PMMA/PVC indicate the possible interactions between the carbonyl group of PMMA and ␣-hydrogen of PVC. Free volume data derived from Positron lifetime measurements showed that the PMMA/ PVC blends to be miscible in low PVC concentration domain. For the first time, the authors have evaluated the hydrodynamic interaction parameter ␣, advocated by Wolf and Schnell , Polymer, 42, 8599 (2001), to take into account the friction between the component molecules using the free volume data. This parameter (␣) has a high value (؊57) at 10 wt% of PVC, which could be taken to read miscibility for PMMA/PVC blends to be high. In the case of PVC/PS blends, the positron results fully support the DSC data to conclude the blends to be immiscible throughout the range of concentration. As expected, the hydrodynamic interaction parameter ␣ does not show any change throughout the concentration in PVC/PS blends, further supporting the idea that ␣ is another suitable parameter in the miscibility study of polymer blends.

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Effect of tacticity on the transition behaviour of poly(methyl methacrylate)/poly(vinyl chloride) blends. Thermally stimulated depolarization study

Cited by 34 publications

References 11 publications

New method of determining miscibility in binary polymer blends through hydrodynamic interaction: The free volume approach

New method of determining miscibility in binary polymer blends through hydrodynamic interaction: The free volume approach

TSDC spectroscopy of relaxational and interfacial phenomena

Free volume microprobe studies on poly(methyl methacrylate)/poly(vinyl chloride) and poly(vinyl chloride)/polystyrene blends

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