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

Abstract

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.

Developing conductive immiscible polystyrene/polypropylene blends with a percolated conducting polyaniline/polyamide filler by tuning its specific interactions with the styrene‐based triblock compatibilizer grafted with maleic anhydride

“…With regard to the blend morphology, the PS phase seems to have undergone phase inversion probably due to an increase in the viscosity ratio of the blends resulting in limited coalescence and break up during extrusion due to the preferential localization of the higher viscous (by a decade at the processing temperature of 150 °C) compatibilizer in the PS. Moreover, increasing the amount of SEBS‐g‐MA to 10–wt % could increase the cocontinuity of the PA phase laden with PANI by the reactive compatibilization of MA and PA, as reported in immiscible 70/30 LDPE/PA6 blends, where 10–wt % of ‐g‐MA compatibilizer (1‐wt % ‐g‐MA) resulted in a cocontinuous morphology without any isolated PA6 phase . This in turn steers the localization of the filler in the PS phase with a uniform dispersion and further leads to the formation of a double percolated filler network in the continuous PS phase (at 40/60 PS/PP ratio).…”

Facile and Safe Synthesis of Novel Self-Pored Amine-Functionalized Polystyrene with Nanoscale Bicontinuous Morphology

“…AFM images confirmed that the NVF-St copolymer underwent phase separation and formed a two-phase bicontinuous structure with non-long-range ordering, when the F NVF became larger than 50% ( Figure 3 ). Note that the size of the bicontinuous morphology was sub-100 nm, which was much smaller than the classical one formed by block copolymers or blends [ 35 , 36 ]. This may have been caused by the random distribution of NVF and styrene units, which prevented the growth of both hydrophobic and hydrophilic phases by forming an interpenetrated phase separation morphology.…”

Compatibilization effect of aminated poly(phthalazinone ether ketone)s in carbon fiber‐reinforced copoly(phthalazinone ether sulfone)s composites

“…It is curious that CF/PPBES/PPEK‐NH 2 (5) has a lower ILSS than that of CF/PPBES/PPEK‐NH 2 (4). The reason for this result maybe that the excessive amino groups exacerbate compatibilizer molecular chains entanglements, which may be lead to aggregations induced by intermolecular forces and hydrogen bond . Besides, molecular weight is also a factor.…”