Isothermal crystallization of poly(ethylene-terephthalate) of low molecular weight by differential scanning calorimetry: 1. Crystallization kinetics

Vilanova, P.Colomer; Ribas, S. Montserrat; Guzmán, G. M.

doi:10.1016/0032-3861(85)90205-8

Cited by 91 publications

(62 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From eq. (10), it follows that at a given degree of crystallinity (here for 10,20,30,40,50,60,70,80, and 90%), a plot of ln k against ln t was obtained, which is shown in Figure 10. The values of b and F(T) for a certain value of X(t) were determined from the slope and intercept of the best fit trend line drawn through the data points for each k at the assigned value of X(t).…”

Section: Liu Modelmentioning

confidence: 99%

“…4 The crystallization behavior 4,5 and kinetics of polymeric materials have been reviewed previously. [6][7][8] In particular, the isothermal and nonisothermal crystallization kinetics of commodity and engineering polymers, such as isotactic polypropylene, [9][10][11][12] filled polypropylenes, 13,14 poly(ethylene terephthalate), 15,16 poly(trimethylene terephthalate), 17,18 poly(butylenes terephthalate), 19 nylon, [20][21][22] and poly(sulfides), [23][24][25] have been investigated in detail, and to much lesser extent, those of biopolymers, such as poly(lactic acid) [26][27][28][29] and poly(e-caprolactone) (PCL), [30][31][32][33] have been studied, although they have found wide commercial importance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

Dhanvijay

Shertukde

Kalkar

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

With increasing environmental awareness, evaluating the potential of biopolymers as a substitute for traditional materials has been of great interest. Crystallization kinetics provides fundamental knowledge required for evaluation, playing vital role in determining the final properties of the product. In this study, the isothermal and nonisothermal crystallization kinetics of poly(e-caprolactone) (PCL) were investigated with the help of various models. The Avrami model best described the isothermal crystallization kinetics, suggesting three-dimensional spherulitic growth, which was in agreement with the morphology studies; whereas the Liu model fit well under nonisothermal crystallization conditions. The failure of the Kissinger model to determine the activation energy was overcome with the Friedman model. The kinetic crystallizability determined by the Ziabacki model indicated a higher crystallization ability of PCL at lower cooling rates.

show abstract

Section: Liu Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

Dhanvijay

Shertukde

Kalkar

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The literature presents a wide range of values for the activation energy of PET crystallization, 83-300 kJ/mol, depending on the crystallization modes (cold or from the melt), molar mass, comonomers, and polymerization conditions. 55,[58][59][60][61] Wide variations from grade to grade could result from different values of this property. The activation energies of the blends with 1, 15, and 20 wt % PS were 61.5, 67.3, and 70.0 kJ/mol, respectively.…”

Section: Activation Energy For Cold Crystallizationmentioning

confidence: 99%

Antinucleating action of polystyrene on the isothermal cold crystallization of poly(ethylene terephthalate)

Wellen

Rabello

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

The effect of polystyrene (PS) on the kinetics of the cold crystallization of poly(ethylene terephthalate) (PET) was thoroughly investigated. The PET/PS blends were essentially immiscible, as observed by dynamic mechanical thermal analysis, which showed two distinct glass-transition temperatures, and by scanning electron microscopy. The neat PET and its blends were isothermally cold-crystallized at various temperatures, and the kinetic parameters were determined with the Avrami approach. PET and its blends presented values of the Avrami exponent close to 2, and the kinetic constant increased with the crystallization temperature increasing. For all the crystallization temperatures studied, the presence of only 1 wt % PS significantly reduced the rate of cold crystallization of PET. A further increase in the PS concentration did not show any significant influence. The blends presented higher values of the activation energy for cold crystallization, which was estimated from Arrhenius plots. The equilibrium melting temperature of neat PET was determined on the basis of the linear HoffmanWeeks extrapolative method to be $ 255 C. This value decreased in the presence of PS, and this suggested limited solubility between PET and PS. From the spherulitic growth equation proposed by Hoffman and Lauritzen, the nucleation parameter was obtained, and it was shown to be higher for the neat PET than for the blends. Moreover, a transition of regimes (I ! II) was observed in both PET and its blends. From the investigations conducted here, it is clear that PS in small amounts causes a reduction in the rate of PET crystallization, acting as an antinucleating agent.

show abstract

“…It is well known that the crystallization rate depends on the crystallization temperature, the molecular weight of polymer, and the presence of a catalyst used for polymerization. Vilanova et al 8 reported that PET with a number-average molecular weight (M V n ) of about 9000 g/mol shows the maximum crystallization rate. Although there is some difference in the molecular weight of the two compared polymers, it is obvious that the crystallization rates of PP2 and PP4 are much faster than are those of PET and PBT, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[13][14][15] These phenomena have initiated explorative studies on the synthesis of poly(p-phenylene alkylene Poly(alkylene terephthalate)s (PATs), e.g., polydicarboxylates) (PPADs) and their properties. (ethylene terephthalate) (PET) [1][2][3][4][5][6][7][8] and poly(buPPADs contrast with PATs in a sense that the tylene terephthalate) (PBT), [9][10][11] have been used bond direction of the ester group in the repeat for fibers, bottles, and plastics due to their good unit of PPADs is reversed as compared with the chemical and physical properties. Most PATs are ester group in the repeat unit of PATs, i.e., PPADs crystalline polymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical structure on crystallization behavior of poly(phenylene alkylene dicarboxylate) (PPAD)

Youk

et al. 1997

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

Various poly( p-phenylene alkylene dicarboxylates) (PPADs) were synthesized and their crystallization behavior was examined as functions of the length and the odd/even numbers of carbon atoms in the aliphatic component. PPADs with longer aliphatic units of even-numbered carbon atoms were found to crystallize faster than do those of other cases. The results are compared with the crystallization behavior of conventional poly(alkylene terephthalate)s (PATs), e.g., poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT), which have the same chemical composition as the corresponding PPAD but the reversed direction of the ester group. The effects of this structural difference on the melting temperature and the crystallization kinetics are also discussed.

show abstract

Isothermal crystallization of poly(ethylene-terephthalate) of low molecular weight by differential scanning calorimetry: 1. Crystallization kinetics

Cited by 91 publications

References 46 publications

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

Isothermal and nonisothermal crystallization kinetics of poly(ϵ‐caprolactone)

Antinucleating action of polystyrene on the isothermal cold crystallization of poly(ethylene terephthalate)

Effect of chemical structure on crystallization behavior of poly(phenylene alkylene dicarboxylate) (PPAD)

Contact Info

Product

Resources

About