Preparation and properties of PBAT/PLA composites modified by PVA and cellulose nanocrystals

Abstract

Cellulose nanocrystal (CNC) was prepared through the hydrolysis of concentrated sulfuric acid using commercial bagasse pulp as a raw material. The performance of the developed CNC was tested through the atomic force microscope, particle size measurement, and zeta potential analysis. The melt blending method was adopted to prepare thermoplastic polyvinyl alcohol (TPVA) and CNC‐TPVA using the glycerol (GI)‐dicondensed triethylene glycol (TEG) complex. The TPVA and CNC‐TPVA were blended with poly(butylene adipate‐coterephthalate) and polylactic acid composite material (COM) through melt extrusion granulation and blown film, and then explored the effect of CNC on the UV aging properties of materials. The complex plasticizer could effectively break the PVA hydrogen bond and reduce its melting point. It had been observed that CNC had good interface compatibility with PVA, and CNC did not affect the crystallinity of PVA, but it could weaken the hydrogen bond between GI, TEG, and PVA, thereby reduce the plasticizing effect of PVA. Compared TPVA‐COM with CNC‐TPVA‐COM, detailed information of crystallization, the thermal stability of materials and mechanical properties was presented in the UV aging process, it was found that the cross‐section of CNC‐TPVA‐COM was rough, and its unevenness formed a striped structure, and its hydrogen bond strength, diffraction peak strength and anti‐aging performance were all improved.

Effectiveness of modified lignin on poly(butylene adipate‐co‐terephthalate)/poly(lactic acid) mulch film performance

“…Therefore, the diffraction peaks observed at 16.6, 17.4, 20.5, 23.1, and 24.7°, correspond to PBAT crystal planes (011), (010), (110), (100), and (111), respectively, indicating triclinic packing in the α‐form of PBAT 9,35,36 . The crystal plane (110) of PLA, generally presents a strong diffraction peak close to 16.0° being superimposed by the diffraction peak of PBAT 37 …”

“…9,35,36 The crystal plane (110) of PLA, generally presents a strong diffraction peak close to 16.0 being superimposed by the diffraction peak of PBAT. 37 Upon lignin addition to PBAT/PLA blend, a decrease in the relative intensity and an increase in the peak width is apparently observed. However, from the peaks area integration and with the aid of Equation ( 1), the percentage of crystallinity was calculated and shown in Table 1, noting that the lignin addition subtly changed the crystallinity of PBAT/PLA, promoting only a quite small increase, which can be considered to be within the error range.…”

Properties and Structure of Thermoplastic Polyvinyl Alcohol/Polyamide Sea-Island Fibers

“…Generally, various plasticizers are blended with commercial PVA pellets in a two-screw extruder. In this process, the macromolecular tacticity of PVA is broken by reducing inter-molecular interaction [24][25][26][27][28][29]. The rheological behavior and spinnability of modified PVA were frequently discussed [30,31].…”

Low‐cost and high‐performance poly(butylene adipate‐co‐terephthalate)/thermoplastic starch blends prepared by an eccentric rotor extruder: Morphology, rheological behavior, thermal and mechanical properties

“…Typical examples are poly(lactic acid) (PLA), 5–8 poly(butylene adipate‐co‐terephthalate) (PBAT), 9–11 poly(ε‐caprolactone) (PCL), 12–14 poly(butylene succinate) (PBS), 15–17 poly(propylene carbonate) (PPC), 18–20 etc. Owing to the advantages of good ductility, elongation at break, impact resistance, processability, and biodegradability, 21,22 PBAT, an aliphatic‐aromatic copolyester, is one of the most widely used biodegradable polymers. Due to similar mechanical properties, PBAT is expected to replace low‐density polyethylene (LDPE) packaging films to alleviate environmental pollution problems 23,24 .…”