Effect of series explosion effects on the fiber length, fiber dispersion and structure properties in glass fiber reinforced polyamide 66

Abstract

Nowadays, glass fiber (GF) reinforced polyamide 66 (PA66) composites have attracted strong interests in commercial and engineering applications due to many advantages, such as corrosion resistance, high potential of integration, self‐lubricating, and high toughness. However, it is very difficult for traditional plastic molding equipment to concurrently obtain the increase of fiber retention length and the improvement of fiber dispersion during the PA66/GF composites manufacturing, which greatly limit the widespread application of such composites. An innovative twin eccentric rotor volume pulsating plasticizing transportation equipment (TERE) based on series explosion effects, is applied to prepare PA66/GF composites at different rotor speeds and fiber loadings. Inside the PA66/GF30 composite prepared by TERE, the fibers are evenly dispersed in polymer matrix and the average fiber length increases by 3.2 times when compared to that of twin‐screw plasticizing transportation equipment (TSE). The Charpy impact strength of PA66/GF composites prepared by TERE is nearly twice that of TSE at all fiber contents. The fatigue properties, thermal oxygen aging properties, and creep properties of the TERE composites exhibit better effects than the TSE composites, indicating that the TERE can ensure longer fiber length and better dispersion effect simultaneously.

Thermal, morphological and mechanical properties of glass fiber reinforced star‐branched polyamide 6

“…With the increase of GF content, the flowability of the composite gradually decreases during the process of polyamide melting and transporting, the friction gradually increases between GF‐GF, GF‐rotor wall, and GF‐stator inner wall, and thus the GF length decreases due to the increasing mechanical damage to GF in the melting extrusion process. [ 23 ] Compared with LPA6/GF composite, at the same GF content SPA6/GF composite has a longer GF length, due to the lower viscosity and higher flowability of SPA6 resin. The actual GF content of SPA6/GF and LPA6/GF composites obtained by muffle furnace calcination at 650°C was shown in Figure 2D.…”

“…The results indicate that the addition of GF has an obvious reinforcement effect on polyamide resin, and the variation of GF content rather than GF length plays an important role in the strength and modulus of composites in this case. [23,29,30] SPA6 and LPA6 have similar molecular weights, and the mechanical properties of SPA6 resin are slightly lower than LPA6 resin due to the existence of star-branched structure. [21] This cause at low GF content some mechanical properties of SPA6/GF composites are slightly lower than LPA6/GF composites, especially impact strength.…”

Recent Advances in Elongational Flow Dominated Polymer Processing Technologies

“…It was found that the simple addition of maleic anhydride-grafted polypropylene as a compatilizer would result in good performance of the SF/PP composites without the need for complex fiber treatment as in conventional extrusion methods [ 64 , 66 ]. Most recently, Wu et al [ 17 ] and Guo et al [ 67 ] investigated the glass fiber (GF) reinforced PA6 and PA66 composites using a novel TERE, as shown in Figure 11 a. They found that the shear flow field formed in the conventional plastic molding devices such as SSE and TSE, can break up the agglomerates by applying excessive shearing intensity, but the subsequent low retention of the average fiber length, would lead to performance degradation.…”

“…and ( b ) the dispersion mechanism of glass fiber (GF) in the PA66 matrix. Reproduced with permission from [ 67 ]. Copyright 2020, John Wiley and Sons.…”

Determination of mechanical performance of glass fiber reinforced and elastomer filled polyamide 6 composites

“…This experimental study was carried out for applications that require consideration of the impact and toughness properties, as well as the strength properties, of 20% short glass fiber reinforced polyamide polymer composites [19][20][21][22][23][24], which is widely used in sectors such as automobile, electrical, electronics, textiles in the industry.…”