Isothermal and non‐isothermal crystallization behavior of PET nanocomposites

Ghasemi, Hesam; Carreau, Pierre J.; Kamal, Musa R.

doi:10.1002/pen.22092

Cited by 23 publications

(18 citation statements)

References 71 publications

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“…At 10°C/min cooling rate, the t 1/2 values for the MXD6 nanocomposites are between 0.84 and 0.89 min. These are lower than that of MXD6, signifying that the addition of Na‐MMT can accelerate the overall crystallization process 75–79. The same conclusion could be observed from Figure 7(b); the crystallization peak of neat MXD6 in the cooling scan is broader, while the nanocomposites show narrower and sharper peaks.…”

Section: Resultssupporting

confidence: 72%

Novel preparation method for enhancing nanoparticle dispersion and barrier properties of poly(ethylene terephthalate) and poly(m‐xylylene adipamide)

Wang

Jabarin

2012

J of Applied Polymer Sci

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A modified melt blending method has been developed for preparing exfoliated nanocomposites of poly(ethylene terephthalate) with sodium-montmorillonite (Na-MMT) and poly(m-xylylene adipamide) with Na-MMT. In this novel compounding process, a Na-MMT water solution was blended with the polymer in a twin screw extruder. This mixing process ensured that the silica nanoparticles were exfoliated in the polymer matrix through fixing the nanoparticles within the polymer matrix almost as they were in water. Transmission electron microscopy (TEM) and X-ray diffraction were used to determine nanoparticle dispersion level. The absence of the X-ray basal reflections in conjunction with the TEM images revealed the exfoliation of clay platelets. Differential scanning calorimetry illustrated that the nucleating abilities of montmorillonite were related to clay content and dispersion morphology. Oxygen permeation results indicated that the improved morphologies had enhanced the barrier properties of the nanocomposites.

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Section: Resultssupporting

confidence: 72%

Novel preparation method for enhancing nanoparticle dispersion and barrier properties of poly(ethylene terephthalate) and poly(m‐xylylene adipamide)

Wang

Jabarin

2012

J of Applied Polymer Sci

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“…Lower crystallinity of PP1 in comparison with PP2 can be explained in terms of its lower chain mobility. Adding the nanoparticles increases the crystallization temperature ( T c ) of the composites in the first cooling cycle, suggesting a nucleating effect . The table shows that X m of PP1/2‐175 is increased by 15% in comparison with PP1/0‐175, but the increase is somewhat less for the other PP1‐based composites.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and morphological properties of cellulose nanocrystal‐polypropylene composites

2017

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In this work, the rheological, mechanical, morphological, and thermal properties of cellulose nanocrystal (CNC)‐polypropylene (PP) composites prepared in the molten state were investigated. All samples contained a maleated PP used as combatibilizer. Degradation of the PP in the presence of CNCs at high processing temperature was shown to have a significant effect on the rheological behavior. For PPs with two different molecular weights and prepared at different temperatures, the tensile modulus of composites containing 2 wt% CNC was improved by about 30% and the tensile strength was increased up to 16%, in comparison with the unfilled matrices. The tensile strain at break of composites decreased by 17% up to 75% with respect to the matrix, depending on the processing conditions and PP used. Preparing the low molecular weight PP composites via twin‐screw extrusion was shown to be more efficient than using an internal batch mixer. The tensile modulus of the PP/CNC composites could be fairly well described by a model proposed by Nielsen based on the Halpin‐Tsai equation. Finally, properties of the PP/CNC composites have been compared to those of a PP reinforced with flax fibers and a PP filled with nanoclay. POLYM. COMPOS., 39:3605–3617, 2018. © 2017 Society of Plastics Engineers

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“…The crystallinity of samples calculated are based on the following equation :

X_{normalc} = \frac{Δ H_{m}}{W_{c} Δ H_{normalm}^{°}} \times 100

where

Δ H_{normalm}^{°}

is the melting enthalpy of the fully crystallized sample, W c in nanocomposites is the weight fraction of polymer, and in the case of blends, stands for weight fraction of the rich phase . It is worth mentioning that the values of melting enthalpies for 100% crystalline PET and PEN are 100.1 J/g and 101 J/g, respectively .…”

Section: Resultsmentioning

confidence: 99%

“…By comparing these values, it reveals that adding graphene to PET, although causing an increment in its crystallization, however, results in a reduction of crystallization rate, while in the case of PEN, introducing graphene in addition to heterogenic nucleating results in increments in crystallization rate. These observations can be related to the synchronized roles of adding nano [36,39,40].…”

Section: Thermal Propertiesmentioning

confidence: 99%

Interrelationship of thermal and mechanical properties of poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate)/graphene nanocomposites

Ghadami

Ehsani

Khonakdar

2015

J Vinyl Addit Technol

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In the present work, attempts were made to investigate the thermal and mechanical properties of melt‐processed poly(ethylene terephthalate) (PET)/poly(ethylene 2,6‐naphthalate) (PEN) blends and its nanocomposites containing graphene by using differential scanning calorimetry and tensile test experimenting. The results showed that crystallinity, which depends on a blend ratio, completely disappeared in a composition of 50/50. By introducing graphene to PET, even in low concentrations, the crystallinity of samples increased, while the nanocomposite of PEN indicated reverse behavior, and the crystallinity was reduced by adding graphene. In the case of PET‐rich (75/25) nanocomposite blends, by increasing the nano content in the blend, the crystallinity of the samples was enhanced. This behavior was attributed to the nucleating effect of graphene particles in the samples. From the results of mechanical experiments, it was found in PET‐rich blends that by increasing the PEN/PET ratio, the modulus of samples decreased, whereas in the case of PEN‐rich blends, a slight increment of modulus is seen as a result of the increment of the PEN/PET ratio. The two contradicting behaviors were attributed to the reduction of crystallinity of PET‐rich blends by enhancement of PEN/PET ratio and the rigid structure of PEN chains in PEN‐rich blends. Unlike the different modulus change of PET‐rich and PEN‐rich blends, the nanocomposites of these blends similarly indicated an increment of modulus and characteristics of rigid materials by increasing the nano content. Furthermore, the same behavior was detected in nanocomposites of each polymer (PET and PEN nanocomposites). The alteration from ductile to rigid conduction was related to the impedance in the role of graphene plates against the flexibility of polymer chains and high values of graphene modulus. J. VINYL ADDIT. TECHNOL., 23:210–218, 2017. © 2015 Society of Plastics Engineers

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Isothermal and non‐isothermal crystallization behavior of PET nanocomposites

Cited by 23 publications

References 71 publications

Novel preparation method for enhancing nanoparticle dispersion and barrier properties of poly(ethylene terephthalate) and poly(m‐xylylene adipamide)

Novel preparation method for enhancing nanoparticle dispersion and barrier properties of poly(ethylene terephthalate) and poly(m‐xylylene adipamide)

Mechanical and morphological properties of cellulose nanocrystal‐polypropylene composites

Interrelationship of thermal and mechanical properties of poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate)/graphene nanocomposites

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