Impact of Molecular Weight on the Thermal Stability and the Miscibility of Poly(ε-caprolactone)/Polystyrene Binary Blends

Mamun, Al; Rahman, Syed Ajijur; Roland, Sébastien; Mahmood, Rizwan

doi:10.1007/s10924-018-1236-1

Cited by 34 publications

(18 citation statements)

References 30 publications

(33 reference statements)

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“…It can be concluded that due to the cleavage of the SF chains upon hydrolysis, SFNP with lower molecular weight exhibited lower thermal stability than the native SF. The strong dependence of the thermal stability on the length of the molecules was reported by Mamun et al [39].…”

Section: Thermal Characterizationmentioning

confidence: 54%

Biodegradable Nanocomposites Developed from PLA/PCL Blends and Silk Fibroin Nanoparticles: Study on the Microstructure, Thermal Behavior, Crystallinity and Performance

et al. 2020

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Recently, the use of natural materials has grown in the plastics industry. In this study, silk fibroin nanoparticle (SFNP) was successfully synthesized from silk fibroin (SF) and analyzed by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The obtained results revealed that the well-ordered domains in SF were changed to an amorphous structure in SFNP and it was attributed to the cleavage of SF polypeptide chains upon acid hydrolysis. Then several blends of poly(lactic acid)/poly(Ԑ-caprolactone) (PLA/PCL) containing different amounts of PCL were prepared and characterized. Based on the test results the best properties were achieved in the blend with 30% of PCL. The addition of 1% of SFNP into this blend enhanced the compatibility between PLA and PCL and reduced the PCL droplet size from 1.170±92 μm to 794±46 nm, this was observed by scanning electron microscopy (SEM). Thermal analysis indicated that the presence of SFNP caused an improvement of thermal degradation stability of the PLA/PCL blend in the end set temperature range. The crystallization process also slowed and the crystal growth rate decreased from 0.34 to 0.31 min-1. Additionally, the use of SFNP increased (9.7%) the hardness value and reduced (15.7%) the water vapor permeability value of the PLA/PCL blend. The results of these experiments demonstrated that the prepared PLA/PCL/SFNP green nanocomposites have good potential for the food packaging applications.

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Section: Thermal Characterizationmentioning

confidence: 54%

Biodegradable Nanocomposites Developed from PLA/PCL Blends and Silk Fibroin Nanoparticles: Study on the Microstructure, Thermal Behavior, Crystallinity and Performance

et al. 2020

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“…However, the most significant changes in the temperature of the onset of degradation assessed based on T 5% and T 10% were shown by the amorphous PLA variety with a low MFI (4032D). Interestingly, unlike the results of rheological tests, the 2500HP polymer showed the highest thermal stability as assessed by the TGA method, which may be associated with the high molecular weight of the polymer [64]. The high-MFI 3100HP and 3260HP PLA varieties showed comparable changes in thermal stability.…”

Section: Thermal Stability Of Extruded Pla Gradesmentioning

confidence: 62%

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

et al. 2020

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This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor.

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“…Generally, relatively large crosslinking density results in high decomposition temperature [29]. It can be seen in Figures S1, S3, and Table S1 that both IPDT and the rise with the increase of relative molecular weight of UHMWPE, indicating that the higher relative molecular mass UHMWPE has, the higher the internal physical entanglement density is and the better thermal stability UHMWPE has [34,35].…”

Section: 5mentioning

confidence: 93%

Thermal Performances of UHMWPE/BN Composites Obtained from Different Blending Methods

Guo

Cao

Cheng

et al. 2019

Advances in Polymer Technology

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UHMWPE/BN composites were prepared by solvent mixing (SM) in this work, then were characterized by scanning electron microscope (SEM), Raman mapping, differential scanning calorimeter (DSC), thermogravimetric analysis (TG), and thermal conductivity meter to study the morphology, filler distribution, segregated structure, and thermal stability as well as thermal conductivity. Compared to the traditional melt mixing (MM), SM followed by molding contributes to the construction of segregated structures in UHMWPE composite. This segregated structure can greatly improve the thermal conductivity of the composites. The segregated structure of composites prepared by MM is destroyed by shearing. Moreover, the thermal stability of composites by SM is improved with the increment of BN content, which is better than that of samples by MM, probably resulting from the barrier function of the segregated structure.

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Impact of Molecular Weight on the Thermal Stability and the Miscibility of Poly(ε-caprolactone)/Polystyrene Binary Blends

Cited by 34 publications

References 30 publications

Biodegradable Nanocomposites Developed from PLA/PCL Blends and Silk Fibroin Nanoparticles: Study on the Microstructure, Thermal Behavior, Crystallinity and Performance

Biodegradable Nanocomposites Developed from PLA/PCL Blends and Silk Fibroin Nanoparticles: Study on the Microstructure, Thermal Behavior, Crystallinity and Performance

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Thermal Performances of UHMWPE/BN Composites Obtained from Different Blending Methods

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