Oriented "shish-kebab" structure can enable remarkable mechanical enhancement in polymers. Therefore, the formation mechanism and practical application of this have been extensively studied. However, effect shish-kebab content on properties is still uncertain. Knowledge crucial academic industrial fields but remains elusive because difficult to control. In work, a self-developed multiflow vibrate-injection molding was used produce samples with different shear layer thicknesses. The...

The orientation and dispersion of nanoparticles can greatly influence the conductivity mechanical properties nanocomposites. In this study, Polypropylene/ Carbon Nanotubes (PP/CNTs) nanocomposites were produced using three different molding methods, i.e., compression (CM), conventional injection (IM), interval (IntM). Various CNTs content shear conditions give states. Then, electrical percolation thresholds (4 wt.% CM, 6 IM, 9 IntM) obtained by various orientations. Agglomerate (Adis),...

The main goal of this research is to study the development crystalline morphology and compare it various mechanical properties microfibrillar composites (MFCs) based on polypropylene (PP) poly(ethylene terephthalate) (PET), by adding a functional compatibilizer non-functional rubber in two different steps processing sequence. MFCs were prepared at weight ratio 80/20 PP/PET twin screw extrusion followed cold drawing injection moulding. non-functionalized polyolefin-based elastomer (POE)...

Abstract Granular polypropylene (PP) and carbon nanotube (CNT) masterbatch are melt‐mixed printed using a custom‐built screw extrusion printer. Compared to the conventional printer (CSP), shear (SSP) with element at end of screw, can apply higher stress melt. Meanwhile, SSP has wider speed match printing speed, is positively correlated stress. The promote dispersion CNTs, thus improving tensile strength. However, circumferential inside superimposed on linear nozzle, makes warping deformation...

In situ microfibrillation and multiflow vibrate injection molding (MFVIM) technologies were combined to control the phase morphology of blended polypropylene (PP) poly(ethylene terephthalate) (PET), wherein PP is majority phase. Four kinds structures formed using different processing methods. As PET content changes, best choice structure also changes. When matrix unoriented, oriented microfibrillar can increase mechanical properties at an appropriate content. However, if (shish-kebab), only...

Blends of isotactic polypropylene (iPP)/β nucleation agent (β-NA)/polyolefin elastomer (POE) were prepared by injection molding. The microstructure and mechanical properties these blends before after being annealed at various temperatures times studied. It was found that annealing simultaneously increased the tensile strength impact strength. As known, degree orientation decreased from skin layer to core layer. all layers with increase temperature time. results showed gave rise chain...

To achieve the goal of preparing an in situ microfibril composite (MFC), multiple strong shear flows were imposed on melt high-density polyethylene (HDPE)/polystyrene (PS). During vibration injection molding (VIM), both phase morphology and crystalline structure show big differences from common (CIM) samples. The PS would deform into ultrafine microfibrils then absorb HDPE matrix to form a shish-kebab super structure. analysis shows that when content increases, size change correspondingly....

In this work, isotactic polypropylene and high density polyethylene blends with tailored crystalline structures were prepared through an accessible injection-molding method. Two hierarchic structures, i.e., shish-kebab epitaxy both successfully obtained among the whole range of samples, which carefully characterized polarized light microscopy, scanning electron differential calorimetry small-angle X-ray scattering. It was found that special structure showed better mechanical properties than...

Abstract Melt mixed polypropylene/polyamide 6 (PA6) and multiwalled carbon nanotubes (CNTs) were molded by compression, injection, interval injection molding. PA phase exists as an isolated dispersed in the sea–island system with different orientations dispersion degrees. CNTs prefer to be located minor because of their remarkable compatibility. However, when content is high enough, a conductive path can formed regardless morphology. Moreover, CNT low, forms unelongated structure, which...

Abstract In this work, the synergistic effect of using multiwalled carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) to regulate temperature response electrical conductivity ( σ ) for poly(lactic acid) (PLA) composites were reported. The addition CNTs into PLA/GNPs markedly enhanced their crystallization capacity , resulting in a reduction percolation threshold from 2.87 (for PLA/GNPs) 0.39 wt% PLA/GNPs/CNTs), which is attributed formation three‐dimensional conductive network within...

Abstract During vibration injection molding (VIM), the in situ microfibril composite (MFC) based on high‐density polyethylene (HDPE)/polystyrene (PS) is molded. A large content of uniform microfibrils with an average diameter about 0.55 µm can be found from surface to center region. This phenomenon shows a big difference skin‐core structure CIM samples as result shear flow. Apart PS phase going through deformation, molecular chains HDPE are also stretched along flow direction. And finally,...

Maleic anhydride‐grafted polypropylene (Ma‐PP) and β nucleation agents (β‐NA) were used to modify the glass fiber (GF)/isotactic (iPP) composite. The interface adhesion, degree of orientation, crystalline morphologies PP/GF composites molded by multiflow vibrate‐injection molding (MFVIM) conventional injection (CIM) studied polarized light microscopy (PLM), scanning electronic (SEM), X‐ray measurements. Results prove that adhesion was improved Ma‐PP; γ crystal generated MFVIM due instant...

ABSTRACT Various annealing temperatures below, near, or above the melting temperature were used to anneal polypropylene with oriented shish kebab and isolated spherulite structures in this work. The results showed that a high decreases time needed achieve ideal material property. When is near temperature, impact strength would be 1.6 times improved by partial recrystallization. crystal structure of was when annealed at 150 °C, whereas 165 170 °C recombined lamellae structure. Moreover,...

Improving the mechanical properties of immiscible PP/PET blend is practical significance especially in recycling process multi-layered plastic solid waste. In this work, a multi-flow vibration injection molding technology (MFVIM) was hired to convert crystalline morphology PP matrix from spherulite into shish-kebab. POE⁻g⁻MA added as compatibilizer, and results showed that compatibilization effect consisted formation core-shell structure by dispersing encapsulate PET. It found joint action...

ABSTRACT The oriented “shish–kebab” structure and β‐crystal can enhance the mechanical properties of polypropylene products. In this regard, equipment β‐nucleation agents have been developed or modified to form shish–kebab β‐crystal. However, effect shish–kebab/β‐crystal proportion on remains unclear. answer is crucial but a challenge because difficulty in manipulating proportion. work, we used self‐made multiflow vibrate‐injection molding, which provide controllable shear flow, produce...

In the past few decades, some modified injection molding technologies aiming to fabricate highly oriented superstructure as "self-reinforcement" phase in molded samples, such SCORIM, DPIM, and PVIM, have been extensively proven be effective improving mechanical properties of polyolefin. However, there is rare report focus on applying these reinforcing products with a more complex geometry structure until now. The vibration technology currently researched at lab scale rather than wildly used...

This study aims to investigate the interfacial crystallization between glass fiber (GF) and polypropylene (PP) by micro-injection molding. Three different kinds of transcrystallinity (TC) were formed at conditions formation mechanisms. The virgin GF could form TC aligning adjacent molecules parallel with surface, while modified (M-GF) induce directly on its surface. Furthermore, M-GF reduced number nano-voids iPP, characterized X-ray scattering technique. When β-nucleation agents (β-NA)...

The transfer process of multi‐walled carbon nanotubes (MWCNTs) from the high density polyethylene (HDPE) phase to polyamide 6 (PA6) has been observed in study. In this paper, is divided into six steps according level mixing energy during blending process. MWCNTs could be extracted HDPE phases and PA due a stronger adhesion between than HDPE. Additionally, morphology change by optical microscope (OPM) also thought crucial for transfer. version disperse continuous was obvious Furthermore,...

Abstract Multiflow injection molding is used to prepare a highly oriented shish‐kebab structure, and the mechanical properties of Polypropylene in weak direction (WD) strong (SD) are analyzed this work. The structure shows anisotropy. For example, impact strength SD 6 times that WD. One or three minutes high‐temperature‐annealing (HTA, 30°C higher than T m ) has been proven be an effective method trigger partial melting re‐crystallization process, which turn, can improve greatly yield both...

This article introduces a one-step extrusion-based fused deposition modeling (FDM) approach for the challenging separation of polypropylene (PP) and polyethylene terephthalate (PET) during recycling. A shear screw printer (SSP) with elements was designed, it compared to conventional single-screw (CSP) investigate differences in print stability, degradation levels, tensile performance, molecular orientation, crystallization when preparing recycled PP PET blends. Although retention effect SSP...