Polymer blends of stereoregular poly(methyl methacrylate) and poly(styrene-co-p-hydroxystyrene)

Hsu, Wen-Ping; Yeh, Chingwei

doi:10.1002/(sici)1097-4628(19990718)73:3<431::aid-app15>3.0.co;2-p

Cited by 33 publications

(35 citation statements)

References 24 publications

(14 reference statements)

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“…A simple estimation of the meso and racemic diad fractions was resorted to. The meso and racemic diad fractions of PMMA were estimated previously 12 according to Fernandez-Martin et al 13 or Allen et al 11 The average meso fractions from these two methods are 0.687, 0.338, and 0.093 for iPMMA, aPMMA, and sPMMA, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…One possible cause for the ternary blends rich in iPMMA to be immiscible arises from interactions between iPMMA and PSAN. The explanation was given previously 10 that iPMMA likely forms a more repulsive interaction with styrene or acrylonitrile than aPMMA and sPMMA.…”

Section: Phase Diagrammentioning

confidence: 95%

“…In a previous study, 10 isotactic, atactic, and syndiotactic PMMAs (designated as i, a, and s-PMMAs) with approximately the same molecular weight were blended with poly(styrene-co-acrylonitrile) (PSAN) (containing 25 wt% of acrylonitrile) in tetrahydrofuran to cast into films. The glass transition temperatures of the polymers were measured.…”

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Phase Behavior of Ternary Blends of Tactic Poly(methyl methacrylate)s and Poly(styrene-co-acrylonitrile)

Hsu

Yeh

1999

Polym J

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ABSTRACT:Previously, atactic and syndiotactic poly(methyl methacrylate)s (PMMAs) were found to be miscible with poly( styrene-co-acrylonitrile) (PSAN) because all the prepared films were transparent and showed composition dependent glass transition temperatures (T.s). However, the isotactic PMMA/PSAN blend was immiscible because most of the cast films were translucent and had two glass transition temperatures. Isotactic PMMA is known to be miscible with atactic PMMA according to literature. Atactic PMMA is miscible with both PSAN and isotactic PMMA but PSAN and isotactic PMMA are immiscible. It will be interesting to study the miscibility of ternary blends of isotactic and atactic PMMAs and PSAN. An investigation based on this is reported in this article. Calorimetry was used as the principal tool to study miscibility. A blend composed of isotactic and atactic PMMAs was also prepared and confirmed to be miscible. T. of this blend seemed to vary linearly with composition. An approximate phase diagram of the ternary blends was established based on differential scanning calorimetry data. The results indicated that the ternary blends rich in isotactic PMMA and with a low PSAN concentration were found to be immiscible. One possible cause is attributed to more repulsive MMA-styrene interaction and/or MMA-acrylonitrile (AN) interaction between isotactic PMMA and PSAN.KEY WORDS Tacticity/ Poly(methyl methacrylate)s I Poly(styrene-co-acrylonitrile) I Ternary Blends jTernary blends are gaining importance in the field of polymers. The first systematic study on ternary blends was reported by Kwei et af.l in 1977. In their study, the addition of poly(vinylidene fluoride) (PVDF) to the immiscible pair poly(methyl methacrylate) (PMMA)/ poly(ethyl methacrylate) (PEMA) was studied and found to be miscible. A list of ternaries investigated has been considerably enlarged. 2 -8 In nearly all these blends, a third component either a homopolymer or copolymer is added to homogenize an immiscible pair. Miscibility is often achieved in cases where this third component is miscible with other polymers.Recently, Bicakci and Cakmak 9 investigated the phase behavior of binary and ternary blends of poly( ethylene naphthalate) (PEN), poly(ether imide) (PEl) and poly-(ether ether ketone) (PEEK) using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMTA) techniques. PEN/PEl and PEl/PEEK binary blends exhibit single glass transition temperatures in full composition range and PEN and PEEK were found immiscible particularly at mid-concentration. When PEl is added to the immiscible PEN/PEEK system, first the blends form two separated PEN-rich and PEEK-rich phases below about 40% PEl concentration, and above this concentration, the three homopolymers form a miscible phase in the amorphous state exhibiting a single Tg. An approximate ternary phase diagram was established based on the DSC and DMT A results.In a previous study, 10 isotactic, atactic, and syndiotactic PMMAs (designated as i, a, and s-PMMAs) with approximately th...

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Section: Resultsmentioning

confidence: 99%

Section: Phase Diagrammentioning

confidence: 95%

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Phase Behavior of Ternary Blends of Tactic Poly(methyl methacrylate)s and Poly(styrene-co-acrylonitrile)

Hsu

Yeh

1999

Polym J

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“…[4][5][6][7][8] Poly(hydroxystyrene) (PHST) and poly(styrene-co-hydroxystyrene) (PST-HST) form miscible blends with various polymers such as poly(alkyl methacrylate), [9][10][11][12][13][14][15][16][17][18][19][20][21] polyesters, [22][23][24][25][26] poly(acrylic acid), [27] and polyethers. [28][29][30] In particular, the blends with poly(alkyl methacrylate) have been widely studied as an attractive hydrogen-bonding interaction system.…”

Section: Introductionmentioning

confidence: 99%

Miscibility of Polynorbornene/Poly(styrene‐co‐hydroxystyrene) Binary Blend Based on Hydrogen‐Bonding Interaction

Tanaka

Nishida

Endō

2009

Macro Chemistry & Physics

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The miscibility and hydrogen bonding interaction of polynorbornene (PNB)/poly(styrene‐co‐hydroxystyrene) (PST‐HST) binary blends were investigated by differential scanning calorimetry and Fourier transform infrared (FT‐IR) spectroscopy. PNB was found to be miscible with PST‐HSTs containing HST unit compositions of 5, 10, 20, and 28 mol‐%, showing a single glass transition, whereas it was immiscible with polystyrene, exhibiting two glass transitions. The hydrogen bonding interaction between the hydroxyl group of PST‐HST and the carbonyl group of PNB was revealed by FT‐IR spectroscopy and plays a key role in the miscibility of PNB/PST‐HST blends.magnified image

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“…Blends of PHS and poly-(methyl methacrylate), PMMA were selected as a model system in this study since hydrogen bonding interactions and miscibility behaviour has been widely reported in the literature. [9][10][11][12][13][14][15][16][17] Indeed, the previous studies on the PHS/ PMMA blend system have detailed its phase behaviour; [11,14] the association mechanism of, and the effect of temperature on, hydrogen bonds; [9,10] its orientation behaviour [15] and the effect of PMMA tacticity on the blend miscibility. [13,17] Physical ageing is the term used to describe the time dependent changes in behaviour in amorphous materials when held at temperatures below the glass transition (T g ).…”

Section: Introductionmentioning

confidence: 99%

Enthalpy Relaxation in Poly(4‐hydroxystyrene)/Poly(methyl methacrylate) Blends

Cowie

Arrighi

McGonigle

2005

Macro Chemistry & Physics

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Summary: The influence of blend composition on enthalpy relaxation behaviour was assessed for miscible blends of poly(4‐hydroxystyrene)/poly(methyl methacrylate) (PHS/PMMA). Values of enthalpy lost (ΔH(Ta, ta)) were calculated from experimental data plotted against log10(ta) and modelled using the Cowie‐Ferguson (CF) semi‐empirical model. This gives a set of values for three adjustable parameters, ΔH∞(Ta), log10(tc) and β. The blends relaxed more slowly than PMMA, but more quickly and less co‐operatively than PHS. Moreover, the blends released more enthalpy than PMMA, but less than PHS. The enthalpy lost by the fully relaxed glass (ΔH∞(Ta)) was less than the theoretical amount possible on reaching the state defined by the liquid enthalpy line extrapolated into the glassy region (ΔHmax(Ta)). Infrared spectroscopy was used for assessing the hydrogen bonding interactions in the blends. The ageing results are discussed with reference to the hydrogen bonding interactions.Dependence of ΔT (□) and ΔCp (▴) on PHS/PMMA blend composition.magnified imageDependence of ΔT (□) and ΔCp (▴) on PHS/PMMA blend composition.

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Polymer blends of stereoregular poly(methyl methacrylate) and poly(styrene-co-p-hydroxystyrene)

Cited by 33 publications

References 24 publications

Phase Behavior of Ternary Blends of Tactic Poly(methyl methacrylate)s and Poly(styrene-co-acrylonitrile)

Phase Behavior of Ternary Blends of Tactic Poly(methyl methacrylate)s and Poly(styrene-co-acrylonitrile)

Miscibility of Polynorbornene/Poly(styrene‐co‐hydroxystyrene) Binary Blend Based on Hydrogen‐Bonding Interaction

Enthalpy Relaxation in Poly(4‐hydroxystyrene)/Poly(methyl methacrylate) Blends

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