Analysis of the rheological property and crystallization behavior of polylactic acid (Ingeo™ Biopolymer 4032D) at different process temperatures

Abstract

The aim of this study was to determine the rheological property and crystallization behavior of polylactic acid (PLA) with improved heat resistance (Ingeo™ Biopolymer 4032D) through investigation of the melt viscosity and crystallization kinetics of PLA at different process temperatures. The viscosity was measured using a rotational rheometer under conditions of shear rates of 0.01, 0.1, and 1/s. The obtained rheological data show that the viscosity tended to decrease slightly as the shear rate increases and decrease sharply as the temperature increases from 180°C to 210°C. To investigate the effect of the process temperature on the crystallization kinetics and final crystallinity of PLA, thermal analysis using isothermal differential scanning calorimetry (DSC) were also performed. The Avrami equation was successfully applied for the isothermal crystallization kinetics model. From crystallization temperature of 85°C to 120°C, we found that the Ingeo™ Biopolymer 4032D PLA had the fastest crystallization rate (t 1/2: 26.0 min) and the largest crystallinity (47.4%) at 100°C.

The Potential of an Itaconic Acid Diester as Environmentally Friendly Plasticizer for Injection‐Molded Polylactide Parts

“…As seen in Figure 3a, not all materials could be tested under these conditions because the resulting viscosity at 210 °C was critically reduced and the equipment was not able to record the pressure generated to obtain the corresponding viscosity values. As Yoo et al proposed, PLA viscosity can be modified with the working temperatures, [ 49 ] so the behavior of the formulations proposed can be controlled during the manufacturing by the programed temperatures. Figure 3a shows plasticized PLA formulations with DBI at a constant temperature of 210 °C.…”

Enhancement in Crystallizability of Poly(L-Lactide) Using Stereocomplex-Polylactide Powder as a Nucleating Agent

“…It was found that the isothermal crystallization peaks of the PLLA3251D matrices in Figure 7 became sharper with the addition of the scPLA powder ( Figure 7 e–g) but the LMW-PLLA powder did not have that effect ( Figure 7 b–d). These sharper peaks were assigned to a shorter time for crystallization [ 33 ]. The t 1/2 values obtained from Figure 8 are reported in Table 5 .…”

IMPROVEMENT IN MECHANICAL PROPERTIES OF FLEXIBLE POLY(L-LACTIDE)-b-POLYETHYLENE GLYCOL-b-POLY(L-LACTIDE) BIOPLASTIC BY MELT BLENDING WITH BORON NITRIDE

“…3. Sharper isothermal crystallization-peaks were assigned to a shorter time for crystallization [26]. It is clearly found that isothermal crystallization peaks of PLLA-PEG-PLLA matrices became sharper by addition of the BN.…”