Bei Yu,Hu Yun,Jia Puyou,Ma Yufeng,Hu Feilong,Xiao Tong,Yang Yong,Zhou Yonghong
Developing bio-based hyperbranched ester plasticizers using woody oil by a simple strategy to replace toxic phthalate plasticizers has significant social, environmental, and economic significance. Herein, a series of tung oil-based hyperbranched esters (TPPs) were synthesis through a one-pot method, the degree of branching and relative molecular weight of the TPPs were controlled by adjusting the glycidyl content. The TPPs were used to plasticize polyvinyl chloride (PVC) materials. The results indicated that TPPs showed better plasticizing properties, transmittance and migration stability compared with commercial dioctyl phthalate (DOP). For instance, the tensile strain of PVC/TPP-9 reached to 560%, and transmittance was 42.1%. In addition, the PVC/TPPs films possessed excellent shape memory performance, and shape fixity and shape recovery were up to 97 and 91%, respectively. The cohesive energy was simulated and calculated from the perspective of energy to first predict the ability of plasticizers migrated from the PVC matrix. These hyperbranched ester plasticizers exhibited the potential to substitute DOP in the fields with strict requirements (e.g. food packaging, toys for children).
A novel hyperbranched ester plasticizer (SOHE) was synthesized from soybean oil. FTIR, 1H NMR, and 13C NMR spectroscopies were used to analyze the chemical structure of SOHE. SOHE was added into poly(vinyl chloride) (PVC). Thermal, mechanical, and dynamic mechanical properties of PVC samples were studied with thermal gravimetric analysis, dynamic mechanical analysis, and tensile tests. The results of SOHE substitution of petroleum-based dioctyl phthalate (DOP) in soft PVC samples were studied. The results indicated that PVC blends mixed with the obtained plasticizer showed higher thermal stability and flexibility. When DOP was completely replaced with SOHE, the Ti, T10, and T50 of the films were raised to 267.5, 275.3, and 338.0 °C, respectively. The plasticizing mechanism was also investigated. The volatility resistance and extraction were studied, which results indicated that the migration stability of PVC samples was significantly enhanced with the increasing amount of SOHE.
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