On the nature of multiple melting in poly(ethylene terephthalate) (PET) and its copolymers with cyclohexylene dimethylene terephthalate (PET/CT)

Ávila‐Orta, Carlos A.; Medellín‐Rodríguez, F. J.; Wang, Zhigang; Navarro-Rodríguez, Dámaso; Hsiao, Benjamin S.; Yeh, Fengji

doi:10.1016/s0032-3861(02)00832-7

Cited by 66 publications

(45 citation statements)

References 33 publications

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“…Furthermore, for the PBT/decylamine/C 60 0.4% wt sample a new sharp endothermic melting peak is observed at higher temperatures. The double or triple melting behavior was observed in several polymers [7,8]. It depends on experimental condition such as temperature, time of crystallization, heating rate, nature of the sample, such as molecular weight and co-polymer content.…”

Section: Dsc Resultsmentioning

confidence: 99%

Investigation of molecular reorientation in poly(butylene terephthalate)/decylamine/fullerene nanocomposites

Woźniak-Braszak¹,

Jurga²,

Jurga³

et al. 2010

Journal of Non-Crystalline Solids

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Section: Dsc Resultsmentioning

confidence: 99%

Investigation of molecular reorientation in poly(butylene terephthalate)/decylamine/fullerene nanocomposites

Woźniak-Braszak¹,

Jurga²,

Jurga³

et al. 2010

Journal of Non-Crystalline Solids

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“…21,30 This experimental technique was first introduced by Reading in 1993. 31 In MDSC, a sinusoidal temperature oscillation (modulation) is overlaid on the conventional linear temperature ramp.…”

Section: Melting Behaviormentioning

confidence: 99%

Morphological features and melting behavior of nanocomposites based on isotactic polypropylene and multiwalled carbon nanotubes

Ávila‐Orta

Medellín‐Rodríguez

Dávila-Rodríguez

et al. 2007

J of Applied Polymer Sci

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Nanocomposites based on low molar mass isotactic polypropylene (iPP) and a low concentrations (1-2 wt %) of multiwalled carbon nanotubes (MWCNTs) were studied using thermal analysis, optical and electronic microscopy, and X-ray diffraction/scattering techniques. It was first determined that MWCNT decrease induction time and act as nucleating agents of the iPP crystals during nonisothermal crystallization. One of the consequences of the nucleation effect was that the original spherulitic morphology of iPP was transformed into a fibrillar-like. The corresponding long period of the original well-defined lamellar structure slightly increased suggesting the formation of thicker crystals in samples containing MWCNT. The nature of the a-iPP crystalline structure was not affected by MWCNT. After nonisothermal crystallization, two melting endotherms were present during thermal scanning of the iPP/MWCNT nanocomposites their proportion changing with the heating rate. After resolving the total DSC signal in its components using MDSC, the overall evolution of such behavior could be explained in terms of the melting/recrystallization mechanism.

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“…The lc, la and L parameters are obtained by simulation of γ 1 (r) (Figure 10a,b), however, it is not clear which calculated value corresponds to lc (or la) [22]. In this respect, some authors have proposed that the big one corresponds to lc [24][25][26][27][28][29], while some others have proposed the opposite [6,22,30,31]. In the present work, the small calculated value was assigned to lc because when it was used to calculate the crystalline degree (Figure 10c), results agreed well with data obtained by WAXD [22].…”

Section: Resultsmentioning

confidence: 99%

Molecular Weight and Crystallization Temperature Effects on Poly(ethylene terephthalate) (PET) Homopolymers, an Isothermal Crystallization Analysis

et al. 2014

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Abstract:The isothermal crystallization of poly(ethylene terephthalate) (PET) homopolymers with different molecular weight was studied in a wide temperature range (140-230 °C) using different experimental techniques. Three different morphological regions, labeled r 1 , r 2 and r 3 , were distinguished as a function of crystallization temperature (T c ). In r 1 (low T c ) crystallized samples were characterized by a low crystalline degree with a small spherulite texture containing thin crystals. In r 2 (intermediate T c ) samples showed medium size spherulites composed of two distinct crystalline families (thin and thick crystals). In this temperature range, the crystallization exhibited a maximum value and it was associated with a high content of secondary crystals. In r 3 (high T c ), samples presented considerable amorphous zones and regions consisting of oversized spherulites containing only thick crystals. Time-resolved wide-angle X-ray diffraction measurements, using synchrotron radiation, indicated a rapid evolution of the crystalline degree within the second region, in OPEN ACCESSPolymers 2014, 6 584 contrast with the quite slow evolution observed in the third region. On the other hand, by small-angle X-ray scattering (SAXS) and time-resolved SAXS experiment, it was found that the long period (L) as well as the lamellar thickness (lc) increase as a function of T c , corroborating the formation of the thickest crystals in the third region. From all these observations, a morphological model was proposed for each region.

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On the nature of multiple melting in poly(ethylene terephthalate) (PET) and its copolymers with cyclohexylene dimethylene terephthalate (PET/CT)

Cited by 66 publications

References 33 publications

Investigation of molecular reorientation in poly(butylene terephthalate)/decylamine/fullerene nanocomposites

Investigation of molecular reorientation in poly(butylene terephthalate)/decylamine/fullerene nanocomposites

Morphological features and melting behavior of nanocomposites based on isotactic polypropylene and multiwalled carbon nanotubes

Molecular Weight and Crystallization Temperature Effects on Poly(ethylene terephthalate) (PET) Homopolymers, an Isothermal Crystallization Analysis

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