Poly(trimethylene terephthalate) molecular weight and Mark–Houwink equation

Chuah, Hoe H.; Lin-Vien, Daimay; Soni, Udit

doi:10.1016/s0032-3861(01)00043-x

Cited by 132 publications

(72 citation statements)

References 8 publications

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“…The intrinsic viscosity of the PTT obtained from a phenol/tetrachloroethane (60/ 40)-mixed solution at 298 K is ϳ 0.84 mL/g. According to published results reported by Chuah et al, 14 the relationship between number-average molecular weight and intrinsic viscosity of the PTT is [] phenol/tetrachloroethane ϭ 5.36M 0.69 . Therefore, the number-average molecular weight of ϳ 43,000 can be estimated.…”

Section: Methodsmentioning

confidence: 97%

Melting behavior of poly(trimethylene terephthalate)

Chung

Yeh

Hong

2002

J of Applied Polymer Sci

101

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ABSTRACT:In this study, the melting behavior of isothermally crystallized polytrimethylene terephthalate (PTT) was investigated. Multiple melting behaviors in DSC heating trace were found because two populations of lamellar stacks were formed during primary crystallization and the recrystallization at heating process, respectively. This fact could be also confirmed from the result of optical microscopy observation. The Hoffman-Weeks equation was applied to obtain equilibrium melting temperature (T m 0 ). The T m 0 value of PTT is about 525 K, which is 10 K higher than that reported. Combining the enthalpy of fusion from the DSC result and the degree of crystallinity from WAXD result, the value of the equilibrium-melting enthalpy ⌬H f 0 was deduced to be approximately 28.8 kJ mol Ϫ1 .

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Section: Methodsmentioning

confidence: 97%

Melting behavior of poly(trimethylene terephthalate)

Chung

Yeh

Hong

2002

J of Applied Polymer Sci

101

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“…The viscosity average molecular weight (M v ) of PTT and its nanocomposites was calculated by using constants: K = 5.36·10 -4 dl/g and " = 0.69 available in literature [31]. The measurements of [!…”

Section: Characterization Methodsmentioning

confidence: 99%

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Szymczyk¹,

Rosłaniec²,

Zenker³

et al. 2011

Express Polym. Lett.

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Poly(trimethylene terephthalate) nanocomposites containing COOH functionalized multi-walled nanotubes were synthesized with in situ polymerization method. The microstructure of the nanocomposites was studied by SEM, in terms of the dispersion state of the nanotubes and the polymer–nanotube interface. The thermal behaviour, mechanical properties and conductivity of these resultant PTT/MWCNTs nanocomposites were studied. The effect of the presence of MWCNTs on cold crystallization of PTT was monitored by dielectric spectroscopy. From thermal analysis study, it is found that the melting temperature and glass transition temperature are not significantly affected by the addition of MWCNTs. The crystallization temperature of PTT matrix is affected by the presence of CNTs. Nanocomposites have slightly higher degree of crystallinity than neat PTT and their thermo-oxidative stability is not significantly affected by the addition of MWCNTs. The study of the isothermal cold crystallization of amorphous PTT and its nanocomposites monitored by dielectric spectroscopy reveals that the presence of MWCNTs have influence on crystallization rate, especially at higher concentration (0.3 wt%). In comparison with neat PTT, the MWCNTs reinforced nanocomposites posses higher tensile strength and Young’s modulus at low MWCNTs loading (0.05–0.3 wt%). In addition, all nanocomposites show reduction of brittleness as compared to the neat PTT. The electrical percolation threshold was found between 0.3 and 0.4 wt% loading of MWCNTs

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“…• C. The intrinsic viscosities (|η|) of polymer solutions were calculated by using single point measurements as given in the following equation [30].…”

Section: Methodsmentioning

confidence: 99%

Oxidative polymerization of acrylamide in the presence of thioglycolic acid

Özeroğlu

Erdoğan

2005

Open Chemistry

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Chemical polymerization of acrylamide at room temperature was examined by using thioglycolic acid-cerium (IV) sulfate and thioglycolic acid-KMnO 4 redox systems in acid aqueous medium. Water soluble polyacrylamides containing thioglycolic acid end groups were synthesized. The effects of the molar ratio of acrylamide to Ce(IV) n AAm /n Ce(IV ) , the polymerization time, the temperature, the monomer concentration, the molar ratio of cerium (IV) sulfate to thioglycolic acid and the concentration of sulfuric acid on the yield and molecular weight of polymer were investigated. Lower molar ratios of acrylamide/Ce(IV) at constant monomer concentration resulted in an increase in the yield but a decrease in molecular weight of polymer. The increase of reaction temperature from 20 to 70 • C resulted in a decrease in the yield but generally resulted in a constant value for the molecular weight of polymer. With increasing polymerization time, the yield and molecular weight of polymer did not change substantially. Ce(IV) and Mn(VII) ions are reduced to Ce(III) and Mn(II) ions respectively in the polymerization reaction. The existence of Ce(III) ion bound to polymer was investigated by UV-visible spectrophotometry and fluorescence measurements. The amount of Mn(II) incorporated into the polymer was determined using graphite furnace atomic absorption spectrometry. The mechanism of this phenomenon is discussed.

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Poly(trimethylene terephthalate) molecular weight and Mark–Houwink equation

Cited by 132 publications

References 8 publications

Melting behavior of poly(trimethylene terephthalate)

Melting behavior of poly(trimethylene terephthalate)

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Oxidative polymerization of acrylamide in the presence of thioglycolic acid

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