ABSTRACT A multi‐functional epoxide oligomer, Joncryl ADR‐4368 (ADR), is used as a modifier to prepare foamable poly(ethylene terephthalate) (PET) by reactive extrusion and compared with common tetra‐functional pyromellitic anhydride (PMDA) reference. Torque evolution reveals that ADR has faster reaction PET than PMDA. The reactions generate long‐chain branches gel structures, which are confirmed rheological methods. Shear studies show modified both PMDA display higher complex viscosity...

Thermoplastic fiber-reinforced composites are increasingly used in industrial applications due to their exceptional mechanical properties, recyclability, and thermal stability. However, manufacturing process poses significant challenges including high processing temperature pressures required for resin impregnation, which can lead void contents incomplete fiber wetting potential degradation. Existing models, such as Darcy law, inadequately describe the non-Newtonian behavior of thermoplastic...

Thermoplastic fiber-reinforced composites such as glass polypropylene are essential in industrial applications for their excellent mechanical properties, thermal stability, and recyclability. The aim of this research is to explore the influence mold temperature, pressure, film thickness on fiber tension melt impregnation process composites; a mathematical model was developed using Reynolds equation, Darcy's law, continuity equation evaluate pressure distribution, resin flow, under varying...

ABSTRACT Thermoplastic polyamide elastomer (TPAE) foams possess the advantages of lightweightness and high resilience, which can be widely used in footwear sports equipment. Nevertheless, like other thermoplastic elastomers, TPAE prepared with supercritical CO 2 as a blowing agent exhibit serious shrinkage problems. This results low unstable expansion ratio, significantly restricts industrialized application. Therefore, this paper proposes method using N co‐blowing for microcellular foaming,...

Although the presence of carbon nanotubes (CNTs) makes polypropylene (PP) electrically conductive, resulting PP/CNT binary nanocomposites become brittle limiting their practical applications. To toughen nanocomposites, calcium carbonate (CaCO3) inorganic nanoparticles are melt-compounded with PP and CNTs components to fabricate conductive tough PP/CNT/CaCO3 ternary nanocomposites. The have a relatively large percolation threshold 6.2 wt %, which reduces 5.6 % by addition 30 pristine CaCO3,...

In order to improve the melt foaming properties of thermoplastic polyamide elastomers and reduce shrinkage rate foamed materials, acid anhydride chain extenders SMA (styrene maleic copolymer) are used in this paper situ reactive blending (TPAE) 6 (PA6). The rheological crystalline modified samples were characterized by a rotational rheometer differential scanning calorimeter, batch experiment with CO2 as agent was carried out. results showed that melting enthalpy TPAE reduced addition...

Abstract The flammability characteristics and thermal stability of a novel halogen‐free flame‐retardant compounding system based on polyoxymethylene (POM) were studied, very effective flame retarding formulation for POM was developed from combination ammonium polyphosphate (APP), melamine cyanurate (MC), novolak, dipentaerythritol. decomposition behavior compounds evaluated by thermogravimetric analysis. compound shows optimal retardancy with limiting oxygen index 52.8 rating UL94 V‐0, when...

Insulators should be designed to perform both their electrical and mechanical functions, without failure or breakage. This paper aims illustrate that a newly silicone shed with nozzle requires no maintenance remove mineral deposits. new design takes advantage of the constant movement air surface deposits commonly cause erosion collapse in insulators. cleaning effect results from passing air, which removes deposited particles surface. approach works well for silicone-elastomer-coated...

Abstract Thermoplastic polyamide elastomer (TPAE) foam material has various important applications, including in shoe materials, cushioning packaging, sports, and automobiles, owing to its excellent resilience anti‐vibration performance. However, linear molecular chain structure, the melt viscoelasticity of TPAE is low, making it difficult obtain lower‐density foamed materials. Therefore, crucial improve strength through extensions. Given ability react with carboxyl amine groups,...

ABSTRACT Polypropylene (PP) foams with double crystal melting peak structure were prepared using supercritical CO 2 as blowing agent. Such was induced by the β‐nucleating agent (NA) and dissolved in a lab‐scale autoclave system. From dynamic rheological behaviors, one can see that long chain branching polypropylene (LCBPP) possess better melt elasticity than linear (LPP). In order to improve foamability, LPP blended LCBPP. The results of differential scanning calorimeter wide‐angle X‐ray...

Abstract In this study, a systematic investigation on the nonisothermal crystallization kinetics of conversional polypropylene (PP) containing various amounts ultra‐high molecular weight polyethylene (UHMWPE) was reported, and effects UHMWPE behavior these PP materials their foaming properties were also presented. The kinetic studies revealed that incorporation into led to an increase in temperature range during process as well relative crystallinity. This attributed comprehensive effect...

Improved viscoelastic, thermal, and mechanical properties of<italic>in situ</italic>microfibrillar polypropylene/polyamide 6,6 composites<italic>via</italic>direct extrusion using a triple-screw extruder.

In this study, polyamide‐66/poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PA66/PPO) blends with high viscosity ratio were processed by a self‐designed triangle‐arrayed triple‐screw extruder (TTSE, which simulates extensional flow) and commercial twin‐screw (TSE), respectively. Furthermore, in order to improve the mechanical properties of immiscible PA66/PPO blends, PPO‐grafted maleic anhydride (PPO‐ g ‐MA) styrene–ethylene–butylene–styrene (SEBS) block copolymer used. The properties, phase...

Three‐dimensional flow field of triangle arrayed triple‐screw extruder (TTSE) in different feed rates, screw speeds and configurations were simulated by POLYFLOW. Polypropylene processing TTSE was tested to validate the numerical simulation. The reliability simulation directly indirectly comparing axial pressure difference residence time distribution (RTD) separately. results show that differences from simulations experiments high agreement. experimental RTD curves same trend, so are average...

The fiber pre-spreading is of great importance when the continuous fiber-reinforced thermoplastic composites are produced by melt impregnation process. In this paper, an improved spreading device introduced, in which via grooving pins for airflow, pre-spread combination airflow and rolls. objective operation to reduce contact friction between bundle surface, thereby reducing fracture during influence on also investigated paper. It found that effect significant rate reduced effectively...

Abstract High melt strength polypropylene (HMS‐PP)/propylene‐based elastomer (PBE) microcellular foams were prepared by the extrusion foam method. The fundamental mechanism of PBE improving foaming properties HMS‐PP was investigated. 6102, with a low flow rate and high ethylene content, enables HMS‐PP/PBE blends to form microphase‐separated structure maintain good pronounced strain hardening, which would promote cell nucleation hold at relatively temperatures. Furthermore, 6102 postpones...

Abstract The properties of basalt fiber reinforced polypropylene composites (BF/PP) were improved by ultrasonic treatment resin building pressure to assist melt impregnation. Combined with the study theory, mechanical modified analyzed using characterization tensile, flexural and impact strengths in response porosity fracture rate. effects power, frequency distance action on composite investigated. results showed that best effect was achieved when 25 kHz, power 300 W, 4 mm, at which time...

Polyethylene terephthalate (PET) foams have the characteristics of being lightweight and high strength, as well offering good heat resistance, minimal water absorption, etc., they been widely used in wind power field. In addition, are promisingly applied automotive, rail, marine, construction, other related fields. Therefore, flame retardancy(FR) PET is an issue that requires investigation. The addition retardants would affect chain extension reaction, viscoelasticity, foamability PET. this...

Abstract Thermoplastic polyamide elastomer (TPAE)/calcium silicate (CaSiO 3 ) open‐cell foam with low shrinkage and high expansion ratio was prepared by using supercritical CO 2 as a blowing agent. Adding CaSiO led to increased melt viscoelasticity reduced crystallinity of TPAE. The primary mechanism promoting TPAE form the structure discussed. interaction between is fragile, making easy fall off cell wall during foaming process. increasing content leads density thinned walls, thus tensile...