Self-Reinforcement of Polypropylene Lid-Shaped Samples Induced by Increasing Shish-Kebab Content: Practical Application of Vibration Injection Technology

Abstract

In the past few decades, some modified injection molding technologies aiming to fabricate highly oriented superstructure as "self-reinforcement" phase in injection molded samples, such as SCORIM, DPIM, and PVIM, have been extensively proven to be effective in improving mechanical properties of polyolefin. However, there is rare report focus on applying these technologies on reinforcing products with a more complex geometry structure until now. The vibration injection technology is currently researched at lab scale rather than wildly used in industry. Here we designed a lid-shaped part, of which the geometry structure is completely different from the rectangle or dumbbell used in the previous studies, and a novel multiflow vibration injection technology was hired to control the content of shish-kebab successfully. The self-reinforcement effect induced by shish-kebab was remarkable, indicated by the overall improvement in mechanical properties. This work gave a new insight into the practical application prospect of vibration injection technology.

Tailoring Hydrocarbon Polymers and All‐Hydrocarbon Composites for Circular Economy

“…From mechanical and tribological investigation they identified mechanical anisotropy of self‐reinforced HDPE . In addition to convergent dies a great variety of highly specialized injection molding processes (see Figure ) like dynamic packing injection molding (DPIM), oscillating packing injection molding (OPIM), shear‐controlled orientation in injection molding (SCORIM), and vibration injection molding (VIM) have been developed to produce self‐reinforced hydrocarbon polymers.…”

New Approach to Optimize Mechanical Properties of the Immiscible Polypropylene/Poly (Ethylene Terephthalate) Blend: Effect of Shish-Kebab and Core-Shell Structure

“…MFVIM can fabricate samples with high content of shish-kebab for pure isotactic PP, which has been extensively studied in our previous work [20,26]. In the current work, 2D-SAXS study was performed to detect the existence of shish-kebab crystals after intense shear induced by MFVIM.…”

“…The only difference between MFVIM and CIM is that during packing stage an extra vibration pressure with an amplitude of 60 MPa and a frequency of 0.55 Hz was provided for MFVIM while for CIM the packing pressure kept constant at 30 MPa. The detailed information about the difference of MFVIM and CIM has been introduced in previous work [20,26]. Temperature profile (°C) from hopper to nozzle was 160, 180, 190, 200, and 200 and mold temperature was set as 40 °C.…”

“…However, the strong shear force needed for the formation of PP shish-kebab crystals may also result in PET fibers or elongated PET droplets, which hinders the formation of the core-shell structure. In this experiment, to obtain PP/PET blends containing core-shell structure and shish-kebab simultaneously, POE– g –MA was added and the facile preparation of shish-kebab with core-shell structure was achieved by utilizing a self-developed multi-flow vibration injection molding technology (MFVIM) [25,26,27], which can provide a periodical strong shear field to the polymer melt in the mold cavity at packing stage. Especially, melt temperature for injection molding was set as 200 °C, at which PET was not fully molten, and thus was supposed to not easily be deformed during the process.…”

Synthesis of a novel char‐forming agent (PEIC): Improvement in flame retardancy, thermal stability, and smoke suppression for intumescent flame‐retardant polypropylene composites

“…As one of the most extensively used polymers, polypropylene (PP) plays important roles in wide range of areas, such as architecture, furniture, and car, due to its good properties in plasticity, corrosion resistance, electric insulation, and so on . However, the characteristics of inflammability seriously deteriorate its safety when subjected to high temperature or open flame, largely restraining the use of PP .…”