Phase morphology development of polypropylene/ethylene-octene copolymer blends: effects of blend composition and processing conditions

Xu, Xinhua; Yan, Xueliang; Zhu, Tao; Zhang, Chunhuai; Sheng, Jing

doi:10.1007/s00289-006-0678-0

Cited by 36 publications

(19 citation statements)

References 36 publications

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“…These fibrillated morphologies are a consequence of the λ of these systems that was seen to be close to 0.5. Morphology depends on parameters, such as interfacial tension, processing parameters and the dispersed phase content 51, 52. Although exceptions to the rule exist,51, 53 it is usually accepted that fibres may be produced when λ ≤ 1; that is, when the matrix is more viscous than the dispersed phase, as is the case for this study.…”

Section: Resultsmentioning

confidence: 85%

Stiffening of Polycarbonate by Addition of a Highly Dispersed and Fibrillated Amorphous Polyamide‐Based Nanocomposite

Goitisolo

Eguiazábal

Nazábal

2010

Macro Materials & Eng

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Ternary systems consisting of blends of polycarbonate (PC) from bisphenol A and minority amounts of an amorphous polyamide reinforced with organically modified nanoclay (naPA), were obtained in the melt state. The nanoclay was widely exfoliated inside the dispersed naPA phase. The dispersed phase exhibited a very fine size (up to 0.36 µm), indicating compatibilization. Compatibilization was attributed to interactions between the aPA and the PC. The nanocomposite showed a lower compatibility than their corresponding blends. This lower compatibility of the nanocomposite was attributed to a hindrance of the interaction by the migrated surfactant of the organoclay. The presence of fibrillation in conjunction with a dispersed nanoclay resulted in additive enhancing effects on the modulus and yield stress. This led to modulus increases up to 46% with respect to that of the neat matrix upon the addition of 25% naPA‐10. Besides exhibiting these remarkable modulus values, these systems show an elongation at break similar to that of the neat PC matrix.magnified image

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Section: Resultsmentioning

confidence: 85%

Stiffening of Polycarbonate by Addition of a Highly Dispersed and Fibrillated Amorphous Polyamide‐Based Nanocomposite

Goitisolo

Eguiazábal

Nazábal

2010

Macro Materials & Eng

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“…Slower than linear growth of R with u has been found only rarely [20,21]. On the other hand, and additional part of the experimental results showed a linear growth of R with u [15,[21][22][23][24]. Recently, strictly linear growth of average R with u was found for polypropylene/ethylene-propylene rubber blend [25].…”

Section: Introductionmentioning

confidence: 74%

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

et al. 2015

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The morphology of quenched and compression molded samples of poly(lactic acid)/polycaprolactone (PLA/PCL) blend prepared by melt mixing was carefully characterized by the method reflecting eventual nonuniformity of the blend structure and/or broad particle size distribution. Determined number and volume average droplet radii for quenched samples were compared with theory, assuming that flow field in a mixing chamber can be substituted by the shear flow with effective shear rate. An increase in droplet radii during compression molding was compared with theory of the coalescence in quiescent state. Using the concept of effective shear flow to describe mixing leads to a strong disagreement between theory and experiment for the critical droplet radius of its breakup, and for the coalescence efficiency. The theory of coalescence in quiescent state provides fair description of an increase in the number average droplet radius during compression molding, but totally fails at prediction of an increase in the volume average droplet radius.

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“…The shear stress was constant in our experiment, while the interfacial tension was significantly reduced by the RL or RC compatibilizers, and so the morphology development indicated a variation of interfacial tension; the greater deformation implied a lower interfacial tension and furthermore a better emulsifying effect of the in-situ formed PLLA grafted RC polymers at the interface. [43][44][45][46][47][48] As shown in Figure S8, the higher magnification TEM micrographs showed that many white particles (30~40 nm in diameter) existed in the PVDF phase when the blends were compatibilized by RL and these particles might be correlated with the PLLA grafted RL polymers, which were drawn from the interface under shear condition. [49][50][51][52] It was noteworthy that such tiny particles were scarcely found in the PVDF phase of the blends compatibilized by RC.…”

Section: Discussionmentioning

confidence: 97%

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

Dong

Wang

et al. 2015

Ind. Eng. Chem. Res.

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Reactive comb (RC) polymers were synthesized by copolymerizing methyl methacrylate (MMA) with glycidyl methacrylate (GMA) and a kind of MMA macromer. The obtained molecules had both epoxide groups and long PMMA side chains distributed randomly along the PMMA backbone. The synthesized RC polymers were applied as compatibilizers in an immiscible poly(L-lactic acid)/poly(vinylidene fluoride) (PLLA/PVDF) system. Compared to their linear counterparts, only 1 wt% of RC polymers with appropriate length of side chains significantly reduced the size and enhanced the uniformity of the PVDF dispersed phase in PLLA matrix and the RC-compatibilized blends exhibited a significant improvement in fracture strain. The higher compatibilization efficiency of RC polymers was ascribed to the existence of PMMA side chains, which improved the stability of RC polymers at the interface of immiscible blend and this was demonstrated by TEM.

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Phase morphology development of polypropylene/ethylene-octene copolymer blends: effects of blend composition and processing conditions

Cited by 36 publications

References 36 publications

Stiffening of Polycarbonate by Addition of a Highly Dispersed and Fibrillated Amorphous Polyamide‐Based Nanocomposite

Stiffening of Polycarbonate by Addition of a Highly Dispersed and Fibrillated Amorphous Polyamide‐Based Nanocomposite

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

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