Abstract
Polydioxanone (PPDO) is synthesized by ring-opening polymerization of p-dioxanone, using stannous octoate as the catalyst. The polarized optical micrograph (POM) shows thes pherulite growth rate of PPDO decreases with an increase in the isothermal crystallization temperature. PPDO is compression-molded into bars, and PPDO bars are subjected to isothermal annealing at a range of temperatures (Ta = 50, 60, 70, 80, 90, and 100 °C), and correspond to three different annealing times (ta = 1h, 2h, 3h). The effect on PPDO is investigated by using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). With an increase in Ta and ta, the grain size and the degree of crystallinity also increase. Meanwhile, the tensile strength is significantly improved. The PPDO bars (90 °C, 2 h) reach the maximum crystallinity (57.21%) and the maximum tensile strength (41.1 MPa). Interestingly, the heat treatment process does not result in serious thermal degradation. It is observed that the hydrolytic degradation of the annealed PPDO is delayed to some extent. Thus, annealed PPDO might have potential applications, particularly in the fields of orthopedic fixation and tissue engineering.
Highlights
With the rapid development of agriculture, medicine, and food packaging, people are increasingly using polymer materials
In order to avoid the possible risks of metal implants implanted in the human body, such as bone corrosion, stress shielding effect, defects of nondegradation, and the need for secondary surgery, absorbable polymer materials are being increasingly favored by researchers
Preparation and isothermal annealing of PPDO bars PPDO was compression-molded into bars with dimensions in accordance with ASTM standard D638-039 specifications, using a Model XLB platen vulcanizing press (Haimen Jinma Rubber & Plastics Machinery Technology Co., Ltd., Haimen, Hainan, China) at 140°C, and the processing pressure was 12.5 MPa
Summary
With the rapid development of agriculture, medicine, and food packaging, people are increasingly using polymer materials. Petro-chemical-based synthetic polymers (polyethylene, polypropylene, polystyrene, etc.) are difficult to degrade in the natural environment [1]. These polymer materials seriously pollute the environment and endanger living organisms. In order to avoid the possible risks of metal implants implanted in the human body, such as bone corrosion, stress shielding effect, defects of nondegradation, and the need for secondary surgery, absorbable polymer materials are being increasingly favored by researchers. Absorbable polymers are mostly used for implant materials that do not require high strength. The degradation properties are one of the important factors affecting the application of absorbable polymers
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