Investigation of compatibility in syndiotactic poly(methyl methacrylate)/poly(vinyl chloride) blends

Albert, B.; Jérôme, Robert; Teyssié, Philippe; Smyth, Gerard; Boyle, Noel G.; McBrierty, Vincent J.

doi:10.1021/ma00145a015

Cited by 65 publications

(19 citation statements)

References 6 publications

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“…Note that I L does not increase near 273 K as would be expected from the melting of bulklike water if present. Therefore, within the sensitivity of NMR, all the water in S (17) (17) 1.00 (17) 0 (0) S (22) "Fraction of water protons. bZLl -Zu are defined in the text.…”

Section: Resultsmentioning

confidence: 99%

Water in hydrogels. 1. A study of water in poly(N-vinyl-2-pyrrolidone/methyl methacrylate) copolymer

Quinn¹,

Kampff²,

Smyth³

et al. 1988

Macromolecules

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220

128

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This paper seeks a clearer understanding of the role of water in hydrated polymers. Pulsed NMR relaxation data for the hydrated copolymer poly(N-vinyl-2-pyrrolidone/methyl methacrylate), P-(NVP/MMA), reveal that a significant part of the water is nonfreezable or bound in the sense that it becomes mobile, much like a glass, at -170 K. Consideration of T2 component intensities allows one to estimate the relative fractions of three distinguishably different types of water in P(NVP/MMA). The bound water can be resolved into a mobile component characterized by a long T2 (type A) and a component of lower mobility that combines with plasticized polymer to form an intermediate T2 (type B). In samples with water content in excess of 276 w t % there is also bulklike water that freezes in the vicinity of 273 K. Parallel DSC measurements predict a lower estimate for the amount of nonfreezable water which correlates rather well with the amount of type A water present. Intercomparison of NMR and DSC data is facilitated by a scheme that envisages five thermal equilibrium states in hydrated P(NVP/MMA). This study highlights the importance of taking the plasticized polymer contribution into account in estimating bound water by the NMR technique. IntroductionThe burgeoning literature on the role of water in natural and synthetic polymers attests to the scientific and commercial importance of these ~ystems.l-~ Substantial progress has been made in unraveling the inherent complexities of water/polymer interactions, with most attention focused upon water in natural polymers, particularly proteins and polypeptides, and in those synthetic polymers such as poly(Zhydroxyethy1 methacrylate) (PHEMA) that

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Section: Resultsmentioning

confidence: 99%

Water in hydrogels. 1. A study of water in poly(N-vinyl-2-pyrrolidone/methyl methacrylate) copolymer

Quinn¹,

Kampff²,

Smyth³

et al. 1988

Macromolecules

Self Cite

220

128

View full text Add to dashboard Cite

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“…T C 1r has been measured in liquid-crystalline poly(ester amides) [14] and blends of poly(vinyl phenol) with poly(methyl acrylate or methacrylate) [15], and a variable temperature study of T C 1r in aromatic polyamide networks and swollen gels has also appeared [16]. 1 H spin-lattice relaxation times in the rotating frame ðT H 1r Þ are a very powerful tool for monitoring the phase separated domains in immiscible polymer blends [17,18]. In a homogeneous sample, all protons relax at about the same rate via spin diffusion.…”

Section: Introductionmentioning

confidence: 99%

Poly(vinyl alcohol)–poly(acrylic acid) interpenetrating networks. Study on phase separation and molecular motions

Hernández

Pérez

Mijangos

et al. 2005

Polymer

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“…10 Å) or the mixing of different components. It is, therefore, possible to evaluate the scale of the miscibility of polymer blends according to the dynamic NMR relaxation measurement, and this approach is considered to be an NMR criterion for miscibility in polymer blend systems 15, 16…”

Section: Introductionmentioning

confidence: 99%

“…Blends of poly(vinyl chloride) (PVC) and poly(methyl methacrylate) (PMMA) have been made with different approaches 8–21. However, the miscibility of this system at the segmental scale has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Investigation at the chain segmental level of the miscibility of poly(vinyl chloride)/atactic poly(methyl methacrylate) blends

Lau

2001

J Polym Sci B Polym Phys

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We employed high-resolution 13 C cross-polarization/magic-angle-spinning/ dipolar-decoupling NMR spectroscopy to investigate the miscibility and phase behavior of poly(vinyl chloride) (PVC)/poly(methyl methacrylate) (PMMA) blends. The spinlattice relaxation times of protons in both the laboratory and rotating frames [T 1 (H) and T 1 (H), respectively] were indirectly measured through 13 C resonances. The T 1 (H) results indicate that the blends are homogeneous, at least on a scale of 200 -300 Å, confirming the miscibility of the system from a differential scanning calorimetry study in terms of the replacement of the glass-transition-temperature feature. The single decay and composition-dependent T 1 (H) values for each blend further demonstrate that the spin diffusion among all protons in the blends averages out the whole relaxation process; therefore, the blends are homogeneous on a scale of 18 -20 Å. The microcrystallinity of PVC disappears upon blending with PMMA, indicating intimate mixing of the two polymers.

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Investigation of compatibility in syndiotactic poly(methyl methacrylate)/poly(vinyl chloride) blends

Cited by 65 publications

References 6 publications

Water in hydrogels. 1. A study of water in poly(N-vinyl-2-pyrrolidone/methyl methacrylate) copolymer

Water in hydrogels. 1. A study of water in poly(N-vinyl-2-pyrrolidone/methyl methacrylate) copolymer

Poly(vinyl alcohol)–poly(acrylic acid) interpenetrating networks. Study on phase separation and molecular motions

Investigation at the chain segmental level of the miscibility of poly(vinyl chloride)/atactic poly(methyl methacrylate) blends

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