Pla ingeo 3251d

Rotational molding grade LMDPE RO93650 in powder form was supplied by Polímeros Nacionales (Guadalajara, Jal, Mexico) and used as received. This polymer has a melt flow index (MFI) of 5.0 g/10 min (190 °C, 2.16 kg) and a density of 0.936 g/cm³, according to the provided technical data sheet. PLA Ingeo 3251D from Nature Works LLC (Blair, NE, USA) with a MFI of 35.0 g/10 min (190 °C, 2.16 kg) and a density of 1.24 g/cm³, according to the provided technical data sheet and supplied as spherical pellets. As a demolding agent, silicone spray lubricant 3A-RP was supplied by Poliformas Plásticas (Guadalajara, Jal, Mexico) and used to prevent the parts sticking to the mold surfaces.
The PLA was firstly pulverized with an ultra-centrifugal mill Retsch ZM 200 (Haan, Germany) in which the size reduction takes place by impact and shearing effects between the rotor and the fixed ring sieve. Furthermore, to facilitate the grinding process and avoid excessive wear of the cutting elements, the PLA was placed in an Arctiko ultra-low temperature freezer (Esbjerg, Denmark) at a temperature of −80 °C at least 24 h before grinding. Table 1 shows the particle size distribution of the used powder polymers measured using a standard (ASTM B214) sieve analysis.

The biopolymers used were PLA Ingeo 3251D from Nature Works LLC (Minnetonka, MN, USA), PHB Y3000 and PHBV Y1000 supplied by Tianan-Enmat (Ningbo, China), and ICO GREEN linear low-density polyethylene (referred to as Green-PE) from A. Shulman (San Luis Potosí, SLP, Mexico). The main physical properties of these biopolymers are shown in Table 1.
Sugarcane straw (SCS) was collected after the mechanical harvesting process at Autlán—El Grullo, Jalisco, Mexico. The SCS was shaken to remove dust and impurities and washed by placing it in containers with water for 24, then separated by decantation and dried outdoors. Afterward, the straw was ground and sieved to obtain particles retained between 50 and 70 mesh.