Structure–property relationship in film and blow molding type high‐density polyethylene polymers from a slurry‐process industrial plant

Abstract

In this study, the microstructural, flow, and mechanical properties of two commercially available high‐density polyethylene (HDPE) samples with different particle sizes were quantified. Specifically, two different blow molding and film grade HDPEs produced by the same catalyst under different conditions were acquired in powder form after dryer section of an industrial plant. They were fractioned according to their particle sizes into six samples: ≤125, 125–200, 200–315, 315–400, 400–500, and ≥ 500 μm. According to sieve analysis, the film grade (D50 = 304 μm) had larger particle sizes related to the counterpart injection sample (D50 = 289 μm). A peak value in density, bulk density, viscosity molecular weight (Mv), melt flow index (MFI), and comonomer content characteristics was found in the particles with the diameter of 125–200 μm in both samples, indicating extremely non‐homogeneity of these HDPE samples. Chemical composition distribution (CCD) of the as received polymers as well as sieved fractions was surveyed via SSA or TREF analyses. The film sample represented lower MFI and density and higher Mv and comonomer content in all fractions, originated from different reactor conditions during the samples synthesis, which translate into improved mechanical properties comparing with the blow molding sample.

Pd on ligand-decorated chitosan as an efficient catalyst for hydrofinishing polyalphaolefins: Experimental and computational studies

“…The current industrial process to get final PAO product, involves a 3-stages process consisting of oligomerization, hydrogenation and distillation. In fact, crude PAOs bear C=C double bonds, which are susceptible to the oxidation at high temperature of usage [40]. To overcome this drawback, hydrofinishing of crude PAO is accomplished, usually at high pressures and temperatures (> 30 bar and >200 °C).…”

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

“…High density and linear low‐density polyethylene, HDPE, and LLDPE constitute the highest share of synthetic polymers market in the world 10,11 . These polymers are commercially produced mostly by heterogeneous Ziegler Natta catalysts 4,12,13 .…”

“…[7][8][9] High density and linear low-density polyethylene, HDPE, and LLDPE constitute the highest share of synthetic polymers market in the world. 10,11 These polymers are commercially produced mostly by heterogeneous Ziegler Natta catalysts. 4,12,13 These catalysts are mainly composed of support (MgCl 2 , Mg(OEt) 2 , and silica) and TiCl 4 as active center, and occasionally electron donor to control isotacticity in polypropylene.…”

Flexible strain sensors with high sensitivity and large working range prepared from biaxially stretched carbon nanotubes/polyolefin elastomer nanocomposites

“…However, these methods are disadvantageous in terms of low efficiency, high cost, and difficult industrial production. Biaxial stretching is a simple and effective film preparation technology, which is also a deformation form in some polymer processing approaches, such as thermoforming, film blowing, and extrusion 13,14 . Biaxial stretching can be used to change the structure and orientation of polymer film materials, thereby widely being studied to enhance the thermal, mechanical, dielectric, and energy storage performances of polymer materials 15–17 .…”

“…Biaxial stretching is a simple and effective film preparation technology, which is also a deformation form in some polymer processing approaches, such as thermoforming, film blowing, and extrusion. 13,14 Biaxial stretching can be used to change the structure and orientation of polymer film materials, thereby widely being studied to enhance the thermal, mechanical, dielectric, and energy storage performances of polymer materials. [15][16][17] The emergence, development, and application of novel materials and preparation methods require biaxially stretched polymer composites to possess multi-functional characteristics.…”