Influence of blending sequence on micro‐ and macrostructure of PA6/mEPDM/EPDMgMA blends reinforced with organoclay

Poly(lactic acid)/poly(e-caprolactone)/organically modified montmorillonite (PLA/PCL/OMMT) nanocomposites were melt-processed in a twin-screw extruder under high shear conditions. As a result of the processing conditions employed, the OMMT layers located in the less compatible PCL phase in all the ternary nanocomposites. The morphology of the PLA/PCL blend evolved from "sea-island" to co-continuous upon the addition of OMMT. Both the X-ray diffraction (XRD) and viscoelastic characterization suggested similar OMMT dispersion in the reference PLA binary and in the PLA/PCL ternary nanocomposites, regardless of its location in the PLA and PCL phase, respectively. The reinforcing effect of the organoclay was also similar. The addition of OMMT to the PLA/PCL blend fully compensated the loss in stiffness and oxygen barrier performance produced by PCL in PLA; the nanocomposite with 3% OMMT showed the same modulus and permeability values as those of pure PLA. Moreover, the ductile behavior (elongation at break > 80%) of the PLA/PCL blend remained constant even in the nanocomposite containing 5% OMMT. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43815.

Section: Mechanical Propertiessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Structure and properties of poly(lactic acid)/poly(ε‐caprolactone) nanocomposites with kinetically induced nanoclay location

Urquijo

Dagréou

Guerrica-Echevarría

et al. 2016

“…The first approach was directly adding elastomers or maleic anhydride grafted elastomers into the PA6 matrix. [9][10][11][12][13][14][15] However, the toughening with elastomer always accompanied with enormous loss in tensile properties and HDT. The second approach was to obtain some "core-shell" toughening particles by skillfully utilizing the interfacial tension in ternary blends during the melting blending process.…”

Section: Introductionmentioning

confidence: 99%

Relationship between structure and properties in high‐performance PA6/SEBS‐g‐MA/(PPO/PS) blends: The role of PPO and PS

Zhang

Shentu

et al. 2017

This work aimed at studying the role of poly(phenylene oxide) (PPO) and polystyrene (PS) in toughening polyamide‐6 (PA6)/styrene‐ethylene‐butadiene‐styrene block copolymer grafted with maleic anhydride (SEBS‐g‐MA) blends. The effects of weight ratio and content of PPO/PS on the morphology and mechanical behaviors of PA6/SEBS‐g‐MA/(PPO/PS) blends were studied by scanning electron microscope and mechanical tests. Driving by the interfacial tension and the spreading coefficient, the “core–shell” particles formed by PPO/PS (core) and SEBS‐g‐MA (shell) played the key role in toughening the PA6 blends. As PS improved the distribution of the “core–shell” particles due to its low viscosity, and PPO guaranteed the entanglement density of the PPO/PS phase, the 3/1 weight ratio of PPO/PS supplied the blends optimal mechanical properties. Within certain range, the increased content of PPO/PS could supply more efficient toughening particles and bring better mechanical properties. Thus, by adjusting the weight ratio and content of PPO and PS, the PA6/SEBS‐g‐MA/(PPO/PS) blends with excellent impact strength, high tensile strength, and good heat deflection temperature were obtained. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45281.

“…The additionally improved compatibilization was attributed to a more effective reaction between the maleic groups of mSEBS and the amine end groups of PA6 by substituting the interaction between the surfactant of organoclay and mSEBS. Gallego et al12 prepared organoclay‐filled PA6/mEPDM/EPDM‐g‐MA using four types of compounding sequences, and found that mixing all the components simultaneously or mixing organoclay with premixed PA6/mEPDM/EPDM‐g‐MA gave smaller average particle size than the other two compounding sequences. Zhang et al13 reported that mixing organoclay or PA6/organoclay with PA6/EPDM‐g‐MA preblends resulted in finer phase morphology than one‐step mixing or mixing PA6/organoclay with EPDM‐g‐MA in the preparation of PA6/EPDM‐g‐MA/organoclay nanocomposites, due to the avoidance of interaction between the surfactant of organoclay and EPDM‐g‐MA.…”

Section: Introductionmentioning

confidence: 99%

Effect of compounding sequence on the morphology of organoclay‐filled PA6/PP/MAPP blends

Wang

Guo

2010

Four types of compounding sequences were utilized to prepare organoclay-filled polyamide 6 (PA6)/polypropylene (PP)/maleic anhydride grafted PP (MAPP) blends. The amount of PA6 molecules grafted to MAPP during in situ compatibilization reaction and the distribution ratio of organoclay in the continuous phase and interface zone were determined quantitatively. The relationship among dispersion and distribution states of organoclay, the amount of PA6 grafted to MAPP as well as the deformation, breakup and coalescence of dispersed droplets was elucidated to interpret the difference in phase morphology. Crystallization behavior and dynamic mechanical properties were also investigated and correlated with the morphology of the materials. It has been shown that the PA6/organoclay masterbatch approach results in the smallest average domain size because of the best organoclay dispersion, the highest amounts of PA6 grafted to MAPP, and organoclay at the interface, which efficiently stabilizes the droplets and prevents coalescence of the droplets. The material prepared by this approach has the biggest improvement in dynamic storage modulus.