Nonisothermal crystallization kinetics of poly(butylene terephthalate)/epoxidized ethylene propylene diene rubber/glass fiber composites

Instability phenomena in film blowing of poly(propylene carbonate) (PPC)/ poly(butylene succinate-co-butylene adipate)(PBSA)/ethylene-methyl acrylateglycidyl methacrylate random terpolymer(AX8900) blends with a high PBSA content was due to low crystallization temperature of PBSA. As a polymeric nucleating agent, poly(butylene succinate) (PBS) was added to achieve a higher crystallization temperature and degree of crystallinity in PBSA/PBS blends (mPBSA). The initial nonisothermal crystallization temperature increased from 34.2 C (pure PBSA) to 57.1 C (mPBSA), leading to a significant improvement for film blowing stability of PPC/mPBSA/AX8900 films. High mPBSA content films were successfully prepared. SEM microphotographs showed that films containing mPBSA have flatter surfaces. PPC/mPBSA/ AX8900 films exhibited 105% greater elongation at break in the transverse direction as well as improved tensile strength and water vapor barrier properties, which has great potential application as green packaging. K E Y W O R D Sblown films, crystallization properties, poly(butylene succinate), poly(butylene succinateco-butylene adipate), poly(propylene carbonate)

“…The Avrami model modified by Jeziorny is used to analyze the nonisothermal crystallization. [ 44 ] The Avrami equation modified by Jeziorny is Equation (5).

1 goodbreak- X_{t} goodbreak= \exp ((), goodbreak- Z_{t} t^{n})

where n is the Avrami index, Z t is the kinetic crystallization rate constant.…”

Section: Resultsmentioning

confidence: 99%

“…The Avrami model modified by Jeziorny is used to analyze the nonisothermal crystallization. [44] The Avrami equation modified by Jeziorny is Equation (5).…”

Section: The Avrami Analysis Of Nonisothermal Crystallizationmentioning

confidence: 99%

Improving crystallization properties of PBSA by blending PBS as a polymeric nucleating agent to prepare high‐performance PPC/PBSA/AX8900 blown films

Jiang

Wang

et al. 2022

“…Or

\lg ([], - \ln ((), 1 - X_{t})) = \lg Z_{t} + n \lg t

where X t is the relative crystallinity; n is the Avrami index, which is related to nucleation, crystal growth, and crystal morphology; t is the time; and Z t is the total crystallization rate constant. Considering the non‐isothermal characteristics of the studied process, Jeziorny suggested that the crystallization rate parameter Z t can be corrected for the influence of cooling rate as follows [ 25 ] :

\lg Z_{c} = \lg Z_{t} / φ

where, Z c is the modified crystallization rate constant. Figure 11A–D present the plots of lg[−ln (1 − X t )] versus lg t .…”

Section: Resultsmentioning

confidence: 99%

Effects of the blending time on the properties and non‐isothermal crystallization behavior of PA6/EVOH blends

Lü

et al. 2021

Both polyamide 6 (PA6) and ethylene vinyl alcohol copolymer (EVOH) have high fractional crystallinity. Non‐isothermal crystallization kinetics is highly important for the design of processing operations. Furthermore, PA6 and EVOH undergo a chemical reaction to form copolymer when melt blended for a sufficiently long time. Therefore, the effects of the blending time on the mechanical properties, rheological properties, and non‐isothermal crystallization kinetics of PA6/EVOH blends were investigated. Non‐isothermal crystallization kinetics were analyzed through the Jeziorny and Mo′s equations, and the Mo′s equation more appropriately described the crystallization behavior of the blends. Mechanical properties, melt viscosity, and storage modulus gradually enhanced with an increase in the blending time, and the elongation at break first increased and then decreased with an increase in the blending time because when the blending time increased, the degree of the reaction between PA6 and EVOH increased, causing adhesion at interfaces and intermolecular interaction to enhance and causing a decrease in molecular chain fluidity. The former leads to an increase in the mechanical properties of the blend, and the latter renders the regular arrangement of chains for crystallization highly difficulty; hence, crystallization fractions in the blend gradually decrease.

“…However, PBT products suffer from brittle fracture and have low impact strength. [5,6] Hence, a blend obtained by combining ABS and PBT has the advantages of both; thus, ABS/PBT blends with desired performance such as high strength, excellent impact strength and good thermal stability can be obtained. [7,8] However, the ABS and PBT resins are immiscible owing to different solubility parameters and the crystallization of PBT.…”

mentioning

confidence: 99%

“…In general, compatibilizers used for the ABS/PBT blend are thermodynamically miscible with the ABS resin and contain epoxy or anhydride groups for the chemical reaction with PBT. [6,8,[11][12][13][14][15][16][17][18][19][20][21][22] Basu et al [15] used styrene maleic anhydride (SMA) as a compatibilizer for the PBT/ABS blend and reported that 5% SMA was optimal for the compatibilization of the PBT/ABS blend (70/30). Yao et al [16] reported that the addition of epoxy resin and styrene acrylonitrile maleic anhydride copolymer into the PBT/ABS blend induced a more stable molten phase structure, which was most suitable for the compatibilization of the blend.…”

mentioning

confidence: 99%

Synthesis of functionalized copolymers and their compatibilization effects on acrylonitrile butadiene styrene/poly(butylene terephthalate) blends

Chai

et al. 2020

In this study, the copolymers of methyl methacrylate‐co‐glycidyl methacrylate (MGD) with different epoxy contents and molecular weights, the styrene‐co‐glycidyl methacrylate (SGD) and methyl methacrylate‐co‐maleic anhydride (MAD) were synthesized. The synthesized copolymers, styrene‐co‐maleic anhydride (SMA) and styrene‐acrylonitrile‐co‐glycidyl methacrylate (SAG) were used as compatibilizers to enhance the impact strength of the acrylonitrile butadiene styrene/poly(butylene terephthalate) (ABS/PBT). The effects of differences in the structure, reactive group type, and molecular weight of the compatibilizers on the mechanical properties, phase morphology, melt viscosity, thermal stability, and melting temperature of the blend were studied. The results showed that functionalized copolymers were successfully synthesized with high monomer conversions. Addition of the functionalized copolymers increased melt viscosity but did not considerably affect thermal stability, tensile strength, flexural strength and melting temperature of the ABS/PBT blends. The compatibilizers improved the dispersion of the PBT phase and prevented brittle fracture, thereby increasing the impact strength of the blend. Among the studied compositions, the ABS/PBT/MGD‐5 blend exhibited the highest impact strength of 25.8 kJ/m2 and an appropriate melt flow index of 19.1 g/10 minutes. The compatibilizer should have an appropriate molecular weight to improve the interface bonding force. Regarding the melting viscosity, the reactive group content and compatibilizer dosage should be adjusted to ensure high impact strength.