Effects of Inorganic Fillers on the Thermal and Mechanical Properties of Poly(lactic acid)

Liu, Xingxun; Wang, Tongxin; Chow, Laurence C.; Yang, Mingshu; Mitchell, James W.

doi:10.1155/2014/827028

Cited by 83 publications

(70 citation statements)

References 26 publications

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“…The increase of ZnO:Cu/Ag NPs content led to shift of Tcc at high temperatures (~99.1°C) than plasticized PLA (95.4°C). The increase of T cc together with increase of T g was attributed to the inorganic nanoparticles presence within the PLA matrix [34]. The enthalpy of melting, ∆H m , increased as the amount of ZnO:Cu/Ag NPs increased in comparison with neat and plasticized PLA - Table 3.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 97%

New PLA/ZnO:Cu/Ag bionanocomposites for food packaging

Vasile¹,

Râpă²,

Ştefan³

et al. 2017

Express Polym. Lett.

101

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 97%

New PLA/ZnO:Cu/Ag bionanocomposites for food packaging

Vasile¹,

Râpă²,

Ştefan³

et al. 2017

Express Polym. Lett.

101

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“…The Haake rheometer with a twin-roll mixer can be used not only for melting and blending of polymers (Liu, Wang, Chow, Yang, & Mitchell, 2014), but also provides information on torque variation during the kneading process. Fig.…”

Section: Shear Behavior Of Starchmentioning

confidence: 99%

Shear degradation of corn starches with different amylose contents

et al. 2017

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a b s t r a c tThis work investigated the effect of shear on the starch degradation, with a particular focus on the changes in molecular and lamellar structures. Corn starches with different amylose/amylopectin ratios (waxy corn starch, or WCS: 1:99; normal corn starch, or NCS: 25:75; and Gelose 80 starch, or G80: 80:20) were used as model materials to be processed using a Haake twin-rotor mixer for different times. Molecular and lamellar structural analysis was performed using size-exclusion chromatography (SEC) and small-angle X-ray scattering (SAXS). The degree of damage of starch at the granule level was evaluated by an assay kit. The results showed that amylose molecules in starch granules did not change significantly, while amylopectin molecules degraded to a stable size caused by the shear treatment. The average thickness of semi-crystalline lamellae disappeared rapidly during processing. A typical positive deviation from Porod's law at a high q region was observed, attributed to the presence of thermal density fluctuations or mixing within phases. Nonetheless, the degree of mixing within phases for the processed samples was lower than the native starch. The study of the mass fractal structure indicated that the scattering objects of the processed starches were more compact than those of the native counterparts. Furthermore, waxy corn starch (containing mostly amylopectin) experienced the greatest granule damage than the other starches. All the results showed that the rigid crystal structure in amylopectin is more sensitive to the shear treatment than the flexible amorphous structure in amylose. This mechanistic understanding at the microstructure level is helpful in designing the processing of starch-based foods or plastics with desired functional properties.

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“…Examinations concerned with the melt and/or cold crystallization behavior of PLA [21][22][23], PLA copolymers [24], PLA stereocomplex [25], and PLA/other polymer blends [26] have been investigated extensively. The crystallization behavior of PLA nanocomposites has also been studied to explore the effect of different types of inorganic fillers [27][28][29][30][31]. The effect of incorporation of nanoclays on isothermal and non-isothermal melt and cold crystallization behavior of PLA has also been studied [14][15][16][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Modifier and Clay Content on Non-Isothermal Cold Crystallization and Melting Behavior of Polylactide/Organovermiculite Nanocomposites

Fernández

2020

Polymers

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In clay/polymer nanocomposites, the crystallization behavior and kinetics of the polymer can be affected by the presence of clay, its content and the degree of miscibility between the clay and the polymer matrix. The effect of two different organomodified vermiculites on the non-isothermal cold crystallization and melting behavior of polylactide (PLA) was studied by differential scanning calorimetry (DSC). In the presence of vermiculites, the cold crystallization of PLA occurred earlier, particularly for the highest content of the most miscible organovermiculite with PLA. The cold crystallinity of PLA decreased at low heating rates, notably at high organoclay loadings, and increased at high heating rates, especially at low vermiculite contents. According to the crystallization half-time, crystallization rate coefficient (CRC), and crystallization rate parameter (CRP) approaches, the cold crystallization rate of PLA increased by incorporating vermiculites, with the effect being most noteworthy for the vermiculite showing better compatibility. The Mo model was successful in describing the non-isothermal cold crystallization kinetics of the PLA/vermiculite composites. The melting behavior was affected by the heating rate and the type and content of clay. The nucleating effect of the most compatible clay resulted in the less perfect crystallites. The activation energy was evaluated using the Kissinger and Takhor methods.

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Effects of Inorganic Fillers on the Thermal and Mechanical Properties of Poly(lactic acid)

Cited by 83 publications

References 26 publications

New PLA/ZnO:Cu/Ag bionanocomposites for food packaging

New PLA/ZnO:Cu/Ag bionanocomposites for food packaging

Shear degradation of corn starches with different amylose contents

Effect of Organic Modifier and Clay Content on Non-Isothermal Cold Crystallization and Melting Behavior of Polylactide/Organovermiculite Nanocomposites

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