Blend miscibility of bisphenol A polycarbonate and poly(ethylene terephthalate) as studied by solid-state high-resolution carbon-13 NMR spectroscopy

Henrichs, P. M.; Tribone, J.; Massa, Dennis J.; Hewitt, J. Michael

doi:10.1021/ma00183a018

Cited by 91 publications

(48 citation statements)

References 18 publications

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“…6 may be applied, which sets a lower domain size limit by establishing the maximum diffusive length (L D ) for full averaging, according to a diffusion coefficient (D), under the effect of relaxation with time constant (T R ), with P = 6 for spherical morphologies (Henrichs et al 1988;Spȇváček et al 2007). The calculation for a lamellar morphology may be more appropriate for lyocell, with P = 2 (Henrichs et al 1988). Other workers have arrived at a derivation to account for diffusion from an extended source, where P = 4/3 rather than 2, (Havens and VanderHart 1985).…”

Section: Crystal Dimensions From 1 H-t 1q Relaxationmentioning

confidence: 99%

Carbon-13 solid state NMR investigation and modeling of the morphological reorganization in regenerated cellulose fibres induced by controlled acid hydrolysis

et al. 2010

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CPMAS carbon-13 NMR has been used to follow structural changes affecting regenerated cellulose fibres during hydrolysis by mineral acids. The C4 envelope of regenerated cellulose was deconvoluted into separate peaks, for ordered (crystal), part-ordered (surface) and disordered (non-crystal) polymer, which allowed calculation of average crystal lateral sizes, in good agreement with WAXD data. A geometrical model has been used to describe recrystallisation at lateral crystal faces, occurring within a disordered boundary surrounding the crystal interior. A onedimensional relaxation-diffusion model has also been constructed, appropriate to the spinodal structure of lyocell. This has provided estimates of proton T 1q relaxation times for pure crystalline (cellulose II) and non-crystalline cellulose, around 24 and 4.5 ms, respectively, at a 45 kHz B 1 field. From the model, crystalline and non-crystalline regions in lyocell are estimated to each be around 2.5 nm thickness for a material of 50% crystallinity, consistent with the 2-3 nm dimensions derived from C4 peak devonvolution.

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Section: Crystal Dimensions From 1 H-t 1q Relaxationmentioning

confidence: 99%

Carbon-13 solid state NMR investigation and modeling of the morphological reorganization in regenerated cellulose fibres induced by controlled acid hydrolysis

et al. 2010

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“…The miscibility of the PET/PC blends has been controversially discussed in literature, from completely miscible for all compositions [2], partially miscible [3,4] to completely immiscible for all compositions [5][6][7][8]. Blends of PET/PC were reported to be miscible in the high polyester range, but blends below 70% polyester were seemed to be immiscible [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effects of composition and transesterification catalysts on the physico-chemical and dynamic properties of PC/PET blends rich in PC

Al-Jabareen¹,

Illescas

Maspoch

et al. 2010

J Mater Sci

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Melt blending of polycarbonate (PC)/poly (ethylene terephthalate) (PET) rich in PC at absence/present of different type of tranesterification catalysts was carried out by using reactive extrusion method. The thermal, dynamic, and morphological properties were studied. It was found that all blends are formed by a PC matrix and a semicrystalline (12-20% of crystallinity) of PET dispersed phase. The addition of a catalyst in the mixing process promotes a refined and homogeneous dispersion of PET, as well as it enhances the dynamicmechanical behavior of PC/PET blends compared with PC. These effects are attributed to the emulsifying effect of the PC-PET copolymer generated by transesterification. Additionally, this copolymer contributes to the miscibility between phases as demonstrated by the glass transition (T g ) shift of PC phase and PET phase.

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“…Several studies report that the miscibility of polyester blends increases with the extent of interchange reactions. 5,6 In particular, the midchain ester-ester interchange [7][8][9] in blends of thermotropic copoly(oxybenzoate-ethylene terephthalate) (POB-PET) and polycarbonate has resulted in a partially miscible system, as evidenced from a single glass-transition temperature in differential scanning calorimetry measurement. 10 At high temperatures, amide-amide and ester-amide interchanges also have occurred in polyamide/polyamide blends [11][12][13][14][15] and polyester/ polyamide blends, respectively.…”

Section: Introductionmentioning

confidence: 99%

Ester-amide exchange in blends of liquid-crystalline copolyester and polyamide 6

Wei

2000

J. Polym. Sci. B Polym. Phys.

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Blend miscibility of bisphenol A polycarbonate and poly(ethylene terephthalate) as studied by solid-state high-resolution carbon-13 NMR spectroscopy

Cited by 91 publications

References 18 publications

Carbon-13 solid state NMR investigation and modeling of the morphological reorganization in regenerated cellulose fibres induced by controlled acid hydrolysis

Carbon-13 solid state NMR investigation and modeling of the morphological reorganization in regenerated cellulose fibres induced by controlled acid hydrolysis

Effects of composition and transesterification catalysts on the physico-chemical and dynamic properties of PC/PET blends rich in PC

Ester-amide exchange in blends of liquid-crystalline copolyester and polyamide 6

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