Compatibilizing efficiency of copolymer precursors for immiscible polymer blends

Yu, Qi‐Yong; Zhang, Cai‐Liang; Gu, Xue‐Ping; Wang, Jiajun; Li, Feng

doi:10.1002/app.35357

Cited by 6 publications

(8 citation statements)

References 30 publications

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“…They were used as precursors to form Ant‐PS‐g‐PA6 graft copolymer‐tracers during reactive polymer blending. Ant‐PS‐Anh, a precursor to form an Ant‐PS‐b‐PA6 block copolymer‐tracer, was synthesized according to a previous work 21 . Specifically, 4‐bromomethylphthalic anhydride was prepared via the reaction of 4‐methylphthalic anhydride and N ‐bromosuccimide in carbon tetrachloride (CCl 4 ) in the presence of benzoyl peroxide.…”

Section: Methodsmentioning

confidence: 99%

Two antagonistic effects of flow/mixing on reactive polymer blending

Cheng

et al. 2022

AIChE Journal

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Reactive polymer blending is basically a flow/mixing-driven process of interfacial generation, interfacial reaction for copolymer formation, and morphology development. This work shows two antagonistic effects of flow/mixing on this process: while flow/mixing promotes copolymer formation by creating interfaces and enhancing collisions between reactive groups at the interfaces, excessive flow/mixing may pull the in situ formed copolymer out of the interfaces to one of the two polymer components of the blend, especially when the copolymer becomes highly asymmetrical.As such, the copolymer may lose its compatibilization efficiency. The mixing-driven copolymer pull-out from the interfaces is a catastrophic process (less than a minute), despite the high viscosity of the polymer blend. It depends on the molecular architecture of the reactive compatibilizer, polymer blend composition, flow/mixing intensity, and annealing. These findings are obtained using the concept of reactive compatibilizer-tracer and a model reactive polymer blend.

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Section: Methodsmentioning

confidence: 99%

Two antagonistic effects of flow/mixing on reactive polymer blending

Cheng

et al. 2022

AIChE Journal

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“…Therefore, PSco-TMI with a very high TMI may be less efficient for compatibilizing PS/PA6 blends. Our previous results 23 showed that for in situ emulsification of polymer blend, reactive block copolymer as emulsifier precursor was more efficient than reactive graft copolymer. It may be concluded that the reactive graft copolymer such as PS-co-TMI with block-inclined-polymer structure have the highest emulsification efficiency.…”

Section: Article Wileyonlinelibrarycom/appmentioning

confidence: 98%

In situ control of co‐continuous phase morphology for PS/PS‐co‐TMI/PA6 blend

Zhang

Zuyi

2013

J of Applied Polymer Sci

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The emulsification efficiency of PS-co-TMI, a copolymer polymerized by styrene and 3-isopropenyl-a,a-dimethylbenzene isocyanate (TMI), for polystyrene (PS)/polyamide 6 (PA6) blend was studied. During the mixing process, an effective emulsifier PS-g-PA6 was generated, which was demonstrated by differential scanning calorimetry (DSC) and fourier transform infrared spectroscopy. PS-g-PA6 generated by PS-co-TMI with high TMI content was found to contain some unreacted isocyanate active groups which reduced using efficiency of PS-co-TMI. Irrespective of TMI content in PS-co-TMI, the dosage of PS-co-TMI reached 20 wt %, unreacted PS-co-TMI was detected. These results indicated that reactive emulsification limits for both active groups' content and reactive precursors' dosage. After the rational addition of PS-co-TMI into PS/PA6 system, phase sizes of co-continuous structure were reduced conspicuously. However, co-continuous structure was evolved into matrix-dispersed structure while the dosage of PS-co-TMI reached 20 wt %. Emulsification efficiencies of PS-co-TMI with different TMI contents, 2.2, 4.1, and 7.5 wt %, were compared. The results revealed PS-co-TMI with 2.2 wt % TMI content had the highest reactive emulsification efficiency because of the blockcopolymer-inclined emulsifier generated in the mixing process.

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“…Improving the performance of polymer materials in scientific and industrial applications can be achieved by mixing different components with complementary properties [ 1 , 2 ]. Typically, the mixing of two (or more) thermodynamically immiscible homopolymers (components) results in unstable interfaces within the systems and the poor mechanical properties of the blends [ 3 ]. For optimization, amphiphilic copolymers are often used as compatibilizers to improve the interfacial stability of highly immiscible mixtures in multi-constituent polymeric systems [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Repulsion Parameter and Chain Length of Homopolymers on Interfacial Properties of An/Ax/2BxAx/2/Bm Blends: A DPD Simulation Study

Liu

Gong

et al. 2021

Polymers

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We explored the effects of the repulsion parameter (aAB) and chain length (NHA or NHB) of homopolymers on the interfacial properties of An/Ax/2BxAx/2/Bm ternary polymeric blends using dissipative particle dynamics (DPD) simulations. Our simulations show that: (i) The ternary blends exhibit the significant segregation at the repulsion parameter (aAB = 40). (ii) Both the interfacial tension and the density of triblock copolymer at the center of the interface increase to a plateau with increasing the homopolymer chain length, which indicates that the triblock copolymers with shorter chain length exhibit better performance as the compatibilizers for stabilizing the blends. (iii) For the case of NHA = 4 (chain length of homopolymers An) and NHB (chain length of homopolymers Bm) ranging from 16 to 64, the blends exhibit larger interfacial widths with a weakened correlation between bead An and Bm of homopolymers, which indicates that the triblock copolymer compatibilizers (Ax/2BxAx/2) show better performance in reducing the interfacial tension. The effectiveness of triblock copolymer compatibilizers is, thus, controlled by the regulation of repulsion parameters and the homopolymer chain length. This work raises important considerations concerning the use of the triblock copolymer as compatibilizers in the immiscible homopolymer blend systems.

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Compatibilizing efficiency of copolymer precursors for immiscible polymer blends

Cited by 6 publications

References 30 publications

Two antagonistic effects of flow/mixing on reactive polymer blending

Two antagonistic effects of flow/mixing on reactive polymer blending

In situ control of co‐continuous phase morphology for PS/PS‐co‐TMI/PA6 blend

Effects of Repulsion Parameter and Chain Length of Homopolymers on Interfacial Properties of An/Ax/2BxAx/2/Bm Blends: A DPD Simulation Study

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