Polyglycolide copolymer composition and preparation thereof
A technology of polyglycolide copolymer and polyglycolide, which is applied in the field of polyglycolide copolymer composition, can solve the problem of decreased tensile modulus, lower thermal stability and mechanical properties, and limit the application of polyglycolide And other issues
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Embodiment 1
[0055] Embodiment 1. polymer production method
[0056] Glycolide and 0.01 parts by weight of ring-opening polymerization catalyst tin dichloride dihydrate were mixed uniformly at 120° C. for 60 minutes in a prefabricated tank reactor in an amount of 0.01 parts by weight relative to the weight of glycolide.
[0057] Then the materials in the prefabricated tank reactor were introduced into the polymerization reactor, and reacted at 200° C. and an absolute pressure of 0.1 MPa for 300 minutes. The polymerization reactor is a plug flow reactor, which can be a static mixer, a twin-screw extruder or a horizontal disc reactor.
[0058] The contents of the polymerization reactor were then introduced into the optimized reactor at a mixing speed of 200 RPM at 220 °C and an absolute pressure of 50 Pa. The reaction time was 30 minutes. As a result, polyglycolide was produced.
Embodiment 2
[0059] Example 2. Characterization
[0060] 1. Weight average molecular weight and its distribution
[0061] The sample was dissolved in 5 mmol / L sodium trifluoroacetate in hexafluoroisopropanol solution to prepare a 0.05-0.3 wt% (mass fraction) solution. The solution was then filtered through a polytetrafluoroethylene filter with a pore size of 0.4 μm. 20 μL of the filtered solution was added to a gel permeation chromatography (GPC) injector to determine the molecular weight of the sample. Five standard molecular weights of methyl methacrylate with different molecular weights were used for molecular weight calibration.
[0062] 2. Tensile strength test
[0063] The tensile strength is tested according to GB / T1040 1-2006, and the tensile speed is 50mm / min.
[0064] 3. Melt flow rate (MFR) test
[0065] The melt flow rate (MFR) (also known as melt flow index (MFI)) of thermoplastic polymers is determined in the following tests: 1) drying the polymer in a vacuum oven at 105...
Embodiment 3
[0066] Example 3. Polyglycolide and polyglycolide copolymer samples
[0067] Four samples were prepared with polyglycolide and one or more additives: polyglycolide 1, polyglycolide 2, polyglycolide copolymer 1 and polyglycolide copolymer 2. Example 1 Polyglycolide and based on the total weight of the sample obtained for example 0.06 wt% Irganox 168, 0.06 wt% Naugard XL-1, 0.1 wt% ADR4368 and / or 0.06% STAB PEP-36 were put into twin screw extrusion machine, then extruded and pelletized into granules at an extrusion temperature of 250°C. The pellets were dried at 120°C for 4 hours and molded into strips for testing using an injection molding machine at an injection temperature of 250°C and a molding temperature of 100°C. Table 1 shows the composition and test results of these four samples.
[0068] Table 1. Polymer synthesis parameters and performance results
[0069]
[0070] In general, polyglycolide degrades after extrusion processing. The MFR of pellets after extrusion...
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