Analysis of phase structure and evolution of PP/PEOc blends during quiescent molten-state annealing process from SEM patterns. Part II. Co-continuous morphology

Zhu, Lin; Xia, Yun; Shen, Xiangqian; Ding, Weiliang; Zhao, Haozhu; Xu, Xinhua

doi:10.1007/s00396-013-2901-5

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…It is well known that coalescence in molten polymer blend can often be observed during quiescent annealing . For an uncompatibilized blend with sea‐island morphology, the increase in droplets size with annealing time following the general power law:

R^{3} (t) = R^{3} (0) + k t

where R 3 is the cube of the average particle radius, R 3 (0) being the initial value at t = 0. The t = 0 is arbitrary, k is the coarsening constant, which depends on the mechanism, annealing temperature, volume fraction of the dispersed phase, etc.…”

Section: Resultsmentioning

confidence: 99%

Encapsulated phase structure and morphology evolution during quiescent annealing in ternary polymer blends with PA6 as matrix

Dou

Wang

Zhou

et al. 2013

J of Applied Polymer Sci

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This work is aim to study the encapsulated morphology development in ternary blends of polyamide 6/high density polyethylene/maleic anhydride-grafted-ethylene propylene diene monomer (PA6/HDPE/EPDM-g-MA) and polyamide 6/maleic anhydridegrafted-high density polyethylene/ethylene propylene diene monomer (PA6/HDPE-g-MA/EPDM) through thermodynamically control described by Harkins spreading theory. The phase morphology was confirmed by using scanning electron microscope (SEM) and selective solvent extraction revealed that PA6/HDPE/EPDM-g-MA blend having a composition of 70/15/15 vol % is constituted of polyamide 6 matrix with dispersed composite droplets of HDPE subinclusions encapsulated by EPDM-g-MA phase, while for PA6/ HDPE-g-MA/EPDM blend with the same composition is constituted of polyamide 6 matrix with dispersed composite droplets of HDPE-g-MA subinclusions encapsulated by EPDM phase. Quiescent annealing test revealed that for PA6/HDPE/EPDM-g-MA blend, a perfect core-shell structure with one HDPE particle encapsulated by EPDM-g-MA phase was formed during annealing, and for PA6/HDPE-g-MA/EPDM blend, a novel complete inverting HDPE-g-MA/EPDM core/shell structure was achieved. Moreover, quantitative analysis about coalescent behaviors of HDPE-g-MA and HDPE subinclusions during quiescent annealing were investigated by image analysis and the result suggested that the grafted maleic anhydride group in HDPE-g-MA, acted as a role of steric repulsion, could suppress coalescence effects, thus leaded to a lower coalescent rate than that of HDPE subinclusions. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39937.

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R^{3} (t) = R^{3} (0) + k t

Section: Resultsmentioning

confidence: 99%

Encapsulated phase structure and morphology evolution during quiescent annealing in ternary polymer blends with PA6 as matrix

Dou

Wang

Zhou

et al. 2013

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…In the past few decades, many studies were conducted on the effects of interfacial tension, viscosity and viscosity ratio, shearing rate or force, feeding sequential, and mixing time , on the formation of co-continuous morphology in uncompatibilized immiscible polymer blends. Actually, these co-continuous morphologies are thermal dynamically unstable and can become coarsened or even degrade to the droplet/matrix morphology under high-temperature annealing or secondary processing. − Hence, whether the co-continuous morphology can be obtained or not in uncompatibilized immiscible polymer blends is determined by the stability of the elongated dispersed fibrils . In uncompatibilized immiscible polymer blends, the deformability of dispersed droplets is determined by the capillary number Ca , which is given by eq : where σ is the interfacial tension, η m is the matrix viscosity, γ̇ is the shear rate, and R 0 is the starting sphere radius.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dual Reactive Compatibilizers on the Formation of Co-Continuous Morphology of Low Density Polyethylene/Polyamide 6 Blends with Low Polyamide 6 Content

Ren

et al. 2016

Ind. Eng. Chem. Res.

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The coexistence of two kinds of reactive compatibilizers at the interface in immiscible LDPE/PA6 blends, namely, polyethylene graft maleic anhydride (PE-g-MAH) with a long backbone length and polybutadiene graft maleic anhydride (PB-g-MAH) with a short backbone length, promoted the formation of a flat interface and induced a cocontinuous morphology in blends containing 30 wt % PA6. The relationships between the contents and content ratios of the dual reactive compatibilizers as well as the morphologies of the resulting LDPE/PA6 blends are examined quantitatively. The morphologies of the blends are characterized by SEM and TEM combined with a selective solvent extraction process. It is found that in these systems, when the total content of the dual compatibilizers is within 20−30 wt % and the content ratio of PE-g-MAH and PB-g-MAH is within 2:1−3:1, the minor PA6 phase can also form a co-continuous morphology in the LDPE matrix. The balance between the stability (determined by in situ formed PE-g-PA6 grafted copolymer with long backbone length) and flexibility of the flat interface (determined by in situ formed PB-g-PA6 grafted copolymer with short backbone length) in the compatibilized LDPE/PA6 blends is the key factor that controls the formation of the co-continuous morphology with low PA6 contents.

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Analysis of phase structure and evolution of PP/PEOc blends during quiescent molten-state annealing process from SEM patterns. Part II. Co-continuous morphology

Cited by 2 publications

References 30 publications

Encapsulated phase structure and morphology evolution during quiescent annealing in ternary polymer blends with PA6 as matrix

Encapsulated phase structure and morphology evolution during quiescent annealing in ternary polymer blends with PA6 as matrix

Effect of Dual Reactive Compatibilizers on the Formation of Co-Continuous Morphology of Low Density Polyethylene/Polyamide 6 Blends with Low Polyamide 6 Content

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