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Degradable polymer composition and preparation method thereof

A technology for degrading polymers and compositions, which is applied in the field of degradable polymer compositions and its preparation, can solve the problems of poor performance of plant-based polymer materials and difficult degradation of synthetic polymer materials, and achieve controllable service life, The effect of promoting the degradation process

Active Publication Date: 2013-06-26
HONG KONG PRODUCTIVITY COUNCIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0036] The technical problem to be solved by the present invention is that existing synthetic polymer materials are difficult to degrade in nature, while degradable plant-based polymer materials have poor performance

Method used

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  • Degradable polymer composition and preparation method thereof
  • Degradable polymer composition and preparation method thereof
  • Degradable polymer composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Take 100g of polyester (polyethylene adipate) and transition metal salt (copper stearate 2g, silver stearate 0.5g and zinc chloride 0.5g) into a twin-screw mixer, after mixing, The filaments in the molten state are extruded from a spinneret, the filaments are solidified, cooled by water, and then cut into pellet form. Wherein, the rotational speed of the twin-screw mixer is 100-280 rpm.

[0081] It was found by FTIR spectroscopy that the carbonyl group (C=O) in the sample structure of the degradable polymer composition prepared in this example was at 1560 cm after 3 days and 10 days of UV treatment -1 The intensity of the absorption band is significantly enhanced (see Figures 1 and 2). The highest intensity of this peak was observed after 14 days of UV irradiation on the degradable polymer composition. According to the literature, the presence of this peak in FTIR reflects the occurrence of chain scission due to photooxidative degradation in the sample.

Embodiment 2

[0083] 100g of the polyester (polyethylene terephthalate), transition metal salts (5g of manganese oleate and 3g of cobalt oleate) and 0.05g of antioxidant IRGANOX? , the filaments in the molten state are extruded from the spinneret, the filaments are solidified, cooled by water, and then cut into pellets. Wherein, the rotational speed of the twin-screw mixer is 100-280 rpm.

[0084] It was found by FTIR spectroscopy that the carbonyl group (C=O) in the sample structure of the degradable polymer composition prepared in this example was at 1560 cm after 3 days and 10 days of UV treatment -1 The intensity of the absorption band is significantly enhanced (see Figures 3 and 4). The highest intensity of this peak was observed after 14 days of UV irradiation on the degradable polymer composition. According to the literature, the presence of this peak in FTIR reflects the occurrence of chain scission due to photooxidative degradation in the sample.

Embodiment 3

[0086] 100g of the polyamide (polyphthalamide) and transition metal salt (2.5g copper oleate, 0.05g zinc oleate, 0.5g cerium stearate) were added into a twin-screw mixer, after mixing, the molten state The filaments are extruded from a spinneret, the filaments are solidified, cooled by water, and then cut into pellet form. Wherein, the rotational speed of the twin-screw mixer is 100-280 rpm.

[0087] It was found by FTIR spectroscopy that the carbonyl group (C=O) in the sample structure of the degradable polymer composition prepared in this example was at 1736 cm after 3 days and 10 days of UV treatment. -1 The intensity of the absorption band is significantly enhanced (see Fig. 5 and Fig. 6). The highest intensity of this peak was observed after 14 days of UV irradiation on the degradable polymer composition. According to the literature, the presence of this peak in FTIR reflects the occurrence of chain scission due to photooxidative degradation in the sample.

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Abstract

The invention discloses a degradable polymer composition comprising a polymer and more than two transition metal salts dispersed in the polymer, wherein at least one of more than two transition metal salts is a polyvalent transition metal salt. The invention further discloses a method for preparing the composition. The method comprises the following steps of: mixing the polymer with the transition metal salts, heating the mixture to the melting state, cooling and forming. The degradable polymer composition is formed by selecting more than two transition metals to produce a synergistic effect in which multiple transition metals play the role of catalyst to produce and initiate free radicals; when the free radicals have high energy after excited by ultraviolet (UV) light or heat, the free radicals have sufficient energy and jointly act to overcome the, activation energy barrier of complex polymer; long molecular chains are fractured into small molecules; and as a result, the synergistic effect remarkably boosts degradation process.

Description

technical field [0001] The invention relates to a degradable polymer composition and a preparation method thereof. Background technique [0002] Polyester is a polymer containing ester functional groups in the main chain. Polyesters include natural chemicals, such as those found in the cutin of plant cuticles, and synthetics such as polycarbonate and polybutyrate, obtained by step-growth polymerization. Depending on its chemical structure, polyesters can be either thermoplastic or thermoset. The most common polyesters are thermoplastic. Polyesters can be aliphatic, semi-aromatic or aromatic, depending on the composition of their backbone, as shown in Table 1. [0003] Table 1 Composition of polyester [0004] main chain composition repeat unit Example of polyester Aliphatic Homopolymer Polyglycolide or polyglycolic acid (PGA) Polylactic acid (PLA) Polycaprolactone (PCL) Copolymer Polyethylene adipate (PEA) ...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L77/00C08L25/06C08K13/02C08K5/098C08K3/16C08K3/30C08K3/28
Inventor 陳敏強林子聰曾慧敏
Owner HONG KONG PRODUCTIVITY COUNCIL
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