Relationship between the chain fold period in poly(ethylene terephthalate) and the crystallization temperature

Włochowicz, A.; Przygocki, Władysław

doi:10.1002/app.1973.070170416

Cited by 26 publications

(4 citation statements)

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“…From Figure 11 it is evident that the Hoffman–Weeks plot showed good linearity. Additionally, the equilibrium melting temperature for PET homopolymer, which was found to be 280.0°C, agreed with that found by other investigators 30–32…”

Section: Resultssupporting

confidence: 91%

Crystallization of 2‐methyl‐1,3‐propanediol substituted poly(ethylene terephthalate). I. Thermal behavior and isothermal crystallization

Lewis

Spruiell

2006

J of Applied Polymer Sci

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Differential scanning calorimetry (DSC) was used to evaluate the thermal behavior and isothermal crystallization kinetics of poly(ethylene terephthalate) (PET) copolymers containing 2-methyl-1,3-propanediol as a comonomer unit. The addition of comonomer reduces the melting temperature and decreases the range between the glass transition and melting point. The rate of crystallization is also decreased with the addition of this comonomer. In this case it appears that the more flexible glycol group does not significantly increase crystallization rates by promoting chain folding during crystallization, as has been suggested for some other glycol-modified PET copolyesters. The melting behavior following isothermal crystallization was examined using a Hoffman-Weeks approach, showing very good linearity for all copolymers tested, and predicted an equilibrium melting temperature (T m 0 ) of 280.0°C for PET homopolymer, in agreement with literature values. The remaining copolymers showed a marked decrease in T m 0 with increasing copolymer composition. The results of this study support the claim that these comonomers are excluded from the polymer crystal during growth.

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Section: Resultssupporting

confidence: 91%

Crystallization of 2‐methyl‐1,3‐propanediol substituted poly(ethylene terephthalate). I. Thermal behavior and isothermal crystallization

Lewis

Spruiell

2006

J of Applied Polymer Sci

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“…The T m o value of PET is lower than those reported previously. 5,6,[35][36][37] Groenickx et al 6 took T m from the temperature at which the endotherm of T m (II-a) was completely melted. Their isothermal crystallization temperature ranged from 186°C to 245°C and the DSC heating rate was 8°C /min.…”

Section: Resultsmentioning

confidence: 99%

Crystallization of poly(ethylene terephthalate-co-isophthalate)

Chang

2000

J. Polym. Sci. B Polym. Phys.

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“…From the secondary nucleation theory," a value of 61, may he predicted from eq. (lo), since for crystallization from the glass 61, should equal 61: 61 = kT/boC (10) Intercept values, low supercooling asymptotes, and calculated values for A T = 100 K are given in Table I1 for poly(ethy1ene terephthalate) and isotactic polystyrene (IPS) crystallized from the glass. Data for the two forms of cispolyisopropene are also included, since thermal equilibrium is achieved in 800-A-thick films on crystallization by quenching long before crystallization begins.…”

Section: Asymptote Calculatedmentioning

confidence: 99%

“…It can be obtained using an equation similar to eq. (10) as follows: (14) The values of qa will, therefore, be simply one-half of the values of q listed in Table I.…”

Section: @mentioning

confidence: 99%

Microkinetics of crystallization in poly(ethylene terephthalate)

Palys

Phillips

1980

J. Polym. Sci. Polym. Phys. Ed.

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The lamellar growth kinetics and lamellar thickness of poly(ethylene terephthalate) crystallized from the glassy state have been determined as a function of crystallization temperature. Values of end and side surface free energies have been estimated as well as the residual lamellar thickness. Analyses carried out using secondary nucleation approaches indicate that the width of a critical nucleus is comparable to the effective substrate length for multiple nucleation in this and other slowly crystallizing polymers at high supercoolings. A “universal” critical value of T italicm2/T2ΔT below which the strip completion process ceases was found to exist. All crystallization must, therefore, occur through the deposition of critical nuclei. Models are proposed for this process which appear to be consistent with both neutron scattering and infrared experiments on quenched polyethylenes. Comparison of crystallization rates, expressed as “jump” rates, with relaxation frequencies suggest that in order for crystallization to occur at any given temperature the relaxation frequency must be at least two decades faster than the crystal “jump” rate.

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Relationship between the chain fold period in poly(ethylene terephthalate) and the crystallization temperature

Cited by 26 publications

References 0 publications

Crystallization of 2‐methyl‐1,3‐propanediol substituted poly(ethylene terephthalate). I. Thermal behavior and isothermal crystallization

Crystallization of 2‐methyl‐1,3‐propanediol substituted poly(ethylene terephthalate). I. Thermal behavior and isothermal crystallization

Crystallization of poly(ethylene terephthalate-co-isophthalate)

Microkinetics of crystallization in poly(ethylene terephthalate)

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