Non-isothermal crystallization kinetics of poly(3-hydroxybutyrate)/EVA 80 blends enhanced by NH4Cl as a nucleating agent

El-Taweel, S. H.; Al-Ahmadi, Arwa

doi:10.1007/s10973-019-08032-y

Cited by 9 publications

(2 citation statements)

References 91 publications

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“…For PLA/nano-TiO2 thermal stability enhancement occurred, as evidenced by the increase of Tonset by 10 o Cwhich agrees with the previous report [9]. Native EVA 80 exhibits two stages of decomposition, the first one started at 314 o C with a maximum of 346 due to deacetylation of the pendant acetate groups of EVA, while the second stage of decomposition with a maximum temperature at 461 is attributed to thermal scission of the backbone methylenic chain [ [45,46] ]. For PLA/ EVA80/ nano-TiO2 blends, the TGA profile exhibits two distinct stages of thermal decomposition; The initial mass loss observed between temperatures of 300-380°C is attributed to the disintegration of the PLA component and the deacetylation of EVA.…”

Section: Scanning Electron Microscopysupporting

confidence: 89%

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Synergistic effect of TiO2 nanoparticles and poly (ethylene-co-vinyl acetate) on the morphology and crystallization behavior of polylactic acid

El-Taweel

2024

Preprint

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The impact of adding 80% vinyl acetate (EVA 80) and 1.0% TiO2 nanoparticles on the morphology and crystallization behavior of poly(lactic acid) blends was investigated using DSC, SEM, and POM. Thermal analysis revealed the enhancement of crystallinity of PLA in the presence of TiO2 and higher EVA 80 content in the blend. The PLA and EVA 80 components showed compatibility as evidenced by the shift of the glass transition temperatures of the PLA phase in the blend to lower values compared to neat PLA. The lower temperature shift of the cold crystallization of the PLA and the formation of the small spherulites of the PLA in the blends indicated that the TiO2 acts as a nucleating agent for crystallization. The non-isothermal crystallization of the blends was evaluated using Avrami's modified model, the MO approach, and Friedman’s isoconversional method. The Avrami’s modified rate constant (K) values and the effective activation energy significantly increased with the incorporation of EVA 80 and TiO2 nanoparticles. Furthermore, the thermogravimetric analysis (TGA) showed improved thermal stability of PLA by adding EVA 80 and TiO2.

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Section: Scanning Electron Microscopysupporting

confidence: 89%

“…Figure 8 𝟏 𝒕 𝟎.𝟓 versus a heating rate for PLA:EVA80: 1 TiO2 compositesJeziorny's modified Avrami equation[47] can be employed to analyze the kinetics of nonisothermal crystallization in crystalline polymers[20,33,46,48] log [− ln(1 − 𝑋(𝑡)] = log 𝑍 𝑡 + 𝑛 𝑙𝑜𝑔(𝑡)Eq. 4…”

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Synergistic effect of TiO2 nanoparticles and poly (ethylene-co-vinyl acetate) on the morphology and crystallization behavior of polylactic acid

El-Taweel

2024

Preprint

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Thermal behavior and soil biodegradation for blends of poly(hydroxybutyrate)/ethylene vinyl acetate copolymer (EVA 60) with 1 mass% NH4Cl

El-Taweel

Al-Ahmadi

2020

Polym. Bull.

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Starch as a successful biodegradable nucleating agent in biodegradable PHBV/PHO blends

El-Taweel,

Al-Hamdi

2024

J Therm Anal Calorim

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The morphology and thermal properties of PHBV/PHO/starch blends are investigated using polarized optical microscopy, differential scanning calorimetry, thermal gravimetric analysis, and X-ray diffraction. The crystallization behavior of the PHBV in PHBV/PHO was improved via the incorporation of a biodegradable nucleating agent, starch, as indicated by thermal analysis and polarized optical micrographs. The PHBV and PHO show phase separation in the blend. The XRD patterns of PHBV in blends are identical to those of neat PHBV. The Avrami exponents were not considerably impacted by the presence of PHO or starch. Furthermore, the nucleation constant, Kg, of the PHBV blends was evaluated using a modified Lauritzen–Hoffmann treatment. The Kg values indicated that the crystallization of PHBV in all blends occur in Regime III. PHO and starch have little impact on the maximum degradation temperature of PHBV.

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Non-isothermal crystallization kinetics of poly(3-hydroxybutyrate)/EVA 80 blends enhanced by NH4Cl as a nucleating agent

Cited by 9 publications

References 91 publications

Synergistic effect of TiO2 nanoparticles and poly (ethylene-co-vinyl acetate) on the morphology and crystallization behavior of polylactic acid

Synergistic effect of TiO2 nanoparticles and poly (ethylene-co-vinyl acetate) on the morphology and crystallization behavior of polylactic acid

Thermal behavior and soil biodegradation for blends of poly(hydroxybutyrate)/ethylene vinyl acetate copolymer (EVA 60) with 1 mass% NH4Cl

Starch as a successful biodegradable nucleating agent in biodegradable PHBV/PHO blends

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