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Thermoplastic composition and method for its preparation

A thermoplastic composition and thermoplastic polymer technology, applied in the field of polymer materials, can solve the problems of no longer having secondary melt processing performance, failure to re-melt and plasticize, and reduced elongation at break, achieving low cost and shape recovery The effect of high rate and large elongation at break

Active Publication Date: 2018-11-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the epoxy group is cured, the elongation at break decreases, and the system becomes a thermosetting polymer system, which cannot be melted and plasticized again, and no longer has secondary melt processing performance, causing a great load on resources and the environment
In recent years, hydrogels with shape memory effect have been developed rapidly. Hydrogels have high elongation at break, but their strength is usually low (<1MPa), making them difficult to apply as engineering materials.

Method used

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  • Thermoplastic composition and method for its preparation
  • Thermoplastic composition and method for its preparation
  • Thermoplastic composition and method for its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, epoxidized polyethylene-vinyl acetate (vinyl acetate content is 60%, and the mass percent composition of epoxy group is 0.5%) 70g and polylactic acid 30g are mixed uniformly by internal mixer at 175 ℃ (totally The mixing time was 5 minutes, the rotor speed was 50 rpm), and then 6.3 g of methyl hexahydrophthalic anhydride was added and the melt blending was continued for 10 minutes to obtain a thermoplastic composition. The thermoplastic composition was hot-pressed by a flat vulcanizer to obtain a sheet with a thickness of 1 mm, which was cut into a standard sample according to national standards for mechanical performance testing. The test results are listed in Table 1.

Embodiment 2

[0030] First, epoxidized polyethylene-vinyl acetate (vinyl acetate content is 60%, and the mass percent composition of epoxy group is 0.5%) 70g and polylactic acid 30g are mixed uniformly by internal mixer at 175 ℃ (totally The mixing time is 5 minutes, the rotor speed is 50 rpm), and then 1.0 g of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane is added and melt-blended for 10 minutes to obtain a thermoplastic composition. The thermoplastic composition was hot-pressed by a flat vulcanizer to obtain a sheet with a thickness of 1 mm, which was cut into a standard sample according to national standards for mechanical performance testing. The test results are listed in Table 1.

Embodiment 3

[0032] First epoxidized polyethylene-vinyl acetate (vinyl acetate content is 60%, the mass percentage composition of epoxy group is 0.5%) 65g and polylactic acid 35g are mixed 5 minutes with internal mixer (blending condition: The temperature is 170°C, the rotor speed is 50 rpm), and then 6.3 g of methyl hexahydrophthalic anhydride is added to continue melt blending for 10 minutes (blending conditions: the temperature is 170 °C, the rotor speed is 80 rpm) to obtain a thermoplastic composition . The thermoplastic composition was hot-pressed by a flat vulcanizer to obtain a sheet with a thickness of 1 mm, which was cut into a standard sample according to national standards for mechanical performance testing. The test results are listed in Table 1.

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Abstract

The invention discloses a thermoplastic composition and a preparing method thereof.The thermoplastic composition comprises, by weight, 60-90 parts of epoxidation polyethylene-vinyl acetate, 10-40 parts of thermoplastic polymers and 0.1-20 parts of cross-linking agent.The preparing method of the thermoplastic composition can be achieved on a traditional high-polymer-material processing device, cost is low, the environment is friendly, and industrial production is easy to achieve.The thermoplastic composition obtained with the provided preparing method has the advantages of being high in shape recovery rate and strength, large in elongation at break, excellent in thermoplastic performance and the like, and can be directly used for extrusion molding, compression molding and the like to be used for preparing various thermoplastic and rubber products.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an epoxidized polyethylene-vinyl acetate thermoplastic composition with a memory effect and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of polymer functionalization, polymer materials with shape memory effect have attracted much attention. The shape memory effect refers to the ability of a material to return to its original shape under certain conditions after it changes from its original shape to another shape and is fixed. [0003] The traditional shape memory effect is attributed to a two-phase structure, i.e., a stationary phase that determines the permanent shape and a reversible phase with certain transition conditions. Merline et al. (Merline J D, Reghunadhan Nair C P, Ninan K N. Synthesis, Characterization, Curing and Shape Memory Properties of Epoxy‐Polyether System [J]. Journal of Macromolecular Scie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L31/04C08L67/04C08L77/06C08L23/12C08K5/1539C08K5/544C08K5/29
CPCC08L31/04C08L2201/12C08L2205/03C08L67/04C08K5/1539C08K5/544C08L77/06C08K5/29C08L23/12
Inventor 马丕明徐鹏武吕培沈田丰东为富陈明清
Owner JIANGNAN UNIV
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