Preparation of polymer/clay nanocomposites via melt intercalation under continuous elongation flow

Zhang, Guizhen; Wu, Ting; Lin, Wangyang; Tan, Yongbin; Chen, Rongyuan; Huang, Zhao‐Xia; Yin, Xiaochun; Qu, Jinping

doi:10.1016/j.compscitech.2017.04.005

Cited by 99 publications

(68 citation statements)

References 31 publications

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“…Follain et al introduced a method to characterize the dispersion of OMMT within the polyamide 12 (PA 12) matrixes by means of TGA analysis. Zhang et al also studied the dispersion of OMMT within the polypropylene (PP) matrixes in the same way. The exact mass fraction of OMMT within the PLA matrixes is also determined by TGA analysis from total matrixes degradation and taking into account the mass loss due to the amount of ammonium cation in OMMT (~40 wt%).…”

Section: Resultsmentioning

confidence: 99%

“…Ultimately, the small OMMT platelets are pulled apart by the tensile stress and the diffusion of polymer chains, resulting in the effective exfoliation of OMMT. Moreover, the 3 processes perhaps occur simultaneously . Figure B schematically shows the roles that tensile stress may play for the exfoliation of OMMT platelets during the process of melt blending.…”

Section: Resultsmentioning

confidence: 99%

“…In the plasticization and transport process, the occupying space of materials is cyclically changed under the synergy of moving plate and sliding plate so that the materials mainly receive the pulsed volume deformation. According to recently published works, the OMMT nanoparticles can disperse better in polymer matrix under elongational flow than under shear flow; thereby, it is conducive to improving the properties of nanocomposites and promoting the dispersion and exfoliation of OMMT using the ERE.…”

Section: Methodsmentioning

confidence: 99%

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Morphology, rheology property, and crystallization behavior of PLLA/OMMT nanocomposites prepared by an innovative eccentric rotor extruder

Tong

Qiu

et al. 2017

Polymers for Advanced Techs

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An innovative eccentric rotor extruder, which can generate continuous elongation flow, was used to fabricate the poly(L‐lactide) (PLLA)/organo‐modified montmorillonite (OMMT) nanocomposites in different OMMT concentrations. The morphology of the nanocomposites was characterized by thermal gravimetric analyzer, X‐ray diffractometer, and transmission electron microscope. The results showed that the OMMT nanoparticles were uniformly dispersed in the PLLA matrix and mainly existed in intercalation mode. The intercalation and exfoliation process of OMMT in the eccentric rotor extruder may be a double‐side exfoliation, which is more effective than the layer‐by‐layer peeling mechanism based on the shear flow. The influence of OMMT on the rheological behavior of PLLA was investigated by dynamic rheological measurements, showing greater improvement of rheological properties for the nanocomposites. The thermo‐mechanical properties analysis indicated that significant enhancement of E′ can be seen for all the nanocomposites. Presence of intercalated OMMT platelets did not lead to a significant shift of the E″ and tan δ curves compared with that of pure PLLA. The crystallization and melting behavior was studied by differential scanning calorimetry, which indicated that the incorporation of OMMT nanoparticles slightly increased the crystallinity of PLLA matrix. The polarizing microscope was further carried out and showed that the dispersed OMMT nanoparticles acted as a heterogeneous nucleating agent to promote the crystallization of PLLA.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Morphology, rheology property, and crystallization behavior of PLLA/OMMT nanocomposites prepared by an innovative eccentric rotor extruder

Tong

Qiu

et al. 2017

Polymers for Advanced Techs

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“…In the work reported here, an innovative eccentric rotor extruder (ERE), which generated elongational flow in the whole conveying, mixing and plasticizing process, was found to give good dispersal and led to a shorter processing time than a twin‐screw extruder (TSE) . Especially, compared to shear flow, the elongational flow well retained the intrinsic molecular weight of neat UHMWPE that indicated very little chain scission .…”

Section: Introductionmentioning

confidence: 88%

Short‐time fabrication of well‐mixed high‐density polyethylene/ultrahigh‐molecular‐weight polyethylene blends under elongational flow: morphology, mechanical properties and mechanism

Lin

Yang

2019

Polymer International

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As linear polyethylenes, ultrahigh‐molecular‐weight polyethylene (UHMWPE) and high‐density polyethylene (HDPE) have the same molecular structure, but the large difference in viscosity between them makes it difficult to obtain well‐mixed blends. An innovative eccentric rotor extruder (ERE) generating an elongational flow was used to prepare HDPE/UHMWPE blends within short processing times. Compared with the obvious two‐phase morphology of a sample from a twin‐screw extruder observed with a scanning electron microscope, few small UHMWPE particles were observed in the HDPE matrix for a sample from the ERE, indicating the good mixing on a molecular level of HDPE/UHMWPE blends achieved by the ERE during short processing times. The morphological changes of blends prepared using the ERE evidenced the good integration of HDPE and UHMWPE even though the UHMWPE content is up to 50 wt% in the blends. Moreover, all blends retained most of the intrinsic molecular weight. The good mixing was further confirmed from the thermal, crystallization and rheological behaviors determined using differential scanning calorimetry and dynamic rheological measurements. Importantly, the 50/50 blend presented improved mechanical properties, especially super‐impact strength of 151.9 kJ m−2 with incomplete‐break fracture state. The strengthening and great toughening effects of UHMWPE on the blends were attributed to the addition of unwrapped UHMWPE long molecular chains. The effective disentanglement mechanism of UHMWPE chains under elongational flow was explained schematically by a non‐parallel three‐plate model. © 2019 Society of Chemical Industry

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“…Jia et al have shown that better mechanical properties and finer dispersion particles have been achieved because of the extensional flow field of vane extruder compared with those of the traditional twin‐screw extruder. Zhang et al take the comparison of a novel extruder generating continuous elongation flow and traditional twin‐screw extruder to fabricate PP/OMMT nanocomposites shows the tensile properties and impact performance of the nanocomposites prepared by novel extruder are better than the nanocomposites prepared by the twin‐screw extruder. Many studies to achieve uniform dispersion of graphene are complicated.…”

Section: Introductionmentioning

confidence: 99%

Formation of polypropylene/functional graphene oxide nanocomposites with Different FGs loading in elongation flow condition

Qiu

Yin

2018

Polymer Engineering & Sci

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Aggregation of nanofiller in polymer matrix is the key barrier to enhance the mechanical and thermal properties of polymer nanocomposites. Here, we report a novel vane mixer based on elongation flow processing, which is facial to achieve the homogeneous dispersion of functional graphene oxide sheets (FGs) in isotactic polypropylene (iPP). Scanning electron microscopy reveals that FGs in iPP matrix are fully exfoliated and uniformly dispersed. The crystallization behavior, mechanical properties and thermal stability of the nanocomposites with different FGs loadings are investigated by differential scanning calorimetry, dynamic thermomechanical analysis, and thermogravimetric analysis, respectively. The results illustrate that the mechanical and thermal stability of the iPP/FGs composites has enhancement obviously at low FGs loadings. POLYM. ENG. SCI., 59:830–837, 2019. © 2018 Society of Plastics Engineers

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Preparation of polymer/clay nanocomposites via melt intercalation under continuous elongation flow

Cited by 99 publications

References 31 publications

Morphology, rheology property, and crystallization behavior of PLLA/OMMT nanocomposites prepared by an innovative eccentric rotor extruder

Morphology, rheology property, and crystallization behavior of PLLA/OMMT nanocomposites prepared by an innovative eccentric rotor extruder

Short‐time fabrication of well‐mixed high‐density polyethylene/ultrahigh‐molecular‐weight polyethylene blends under elongational flow: morphology, mechanical properties and mechanism

Formation of polypropylene/functional graphene oxide nanocomposites with Different FGs loading in elongation flow condition

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