Abstract
The polylactic acid (PLA) resin Ingeo 4032D was selected as the research object. Epoxy soybean oil (ESO) and zeolite (3A molecular sieve) were used as plasticizer and reinforcing filler, respectively, for PLA blend modification. The mixture was granulated in an extruder and then blown to obtain films under different conditions to determine the optimum processing temperatures and screw rotation. Then, the thermal behaviour, crystallinity, optical transparency, micro phase structure and physical properties of the film were investigated. The results showed that with increasing zeolite content, the crystallization behaviour of PLA changed, and the haze of the film increased from 5% to 40% compared to the pure PLA film. Zeolite and ESO dispersed in the PLA matrix played a role in toughening and strengthening. The PLA/8 wt% zeolite/3 wt% ESO film had the highest longitudinal tensile strength at 77 MPa. The PLA/2 wt% zeolite/3 wt% ESO film had the highest longitudinal elongation at 13%. The physical properties depended heavily on the dispersion of zeolite and ESO in the matrix.
Highlights
The polylactic acid (PLA) resin Ingeo 4032D was selected as the research object
That and the low-temperature peak is due to the melting of the initial crystal, while the highthe PLA molecular chains are added; this interaction replaces the interaction temperature is due to recrystallization that occurs during the heating process, which between thepeak original molecular chains, weakening the force between the molecular improves the ordered arrangement of the chain segments in the crystal plate
The results show that the addition of zeolite can obviously accelerate the crystallization rate of PLA
Summary
PLA (Ingeo 4032D) was purchased from Nature Works Company (Blair, NE, USA). At a temperature of 190 ◦ C, loading pressure of 2.16 kg and cutting time interval of 30 s, the MFR of Ingeo 4032D PLA was 5.872 g/10 min. Epoxidized soybean oil (ESO) was purchased from Xinjinlong Plastic Additives Co., Ltd. Zeolite (3A molecular sieve, with an average particle size of 2–5 μm) was purchased from Yuanli Chemical Co., Ltd. Zeolite (3A molecular sieve, with an average particle size of 2–5 μm) was purchased from Yuanli Chemical Co., Ltd. (Tianjin, China)
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