Low-viscosity reversible cross-linked polycaprolactone as well as preparation method and application thereof

Abstract

The invention provides low-viscosity reversible cross-linked polycaprolactone as well as a preparation method and application thereof. The low-viscosity reversible cross-linked polycaprolactone disclosed by the invention is obtained by introducing a reversible Diels-Alder (DA) bond onto polycaprolactone, wherein the number average molecular weight of the polycaprolactone is 4000-12000. According to the invention, the reversible Diels-Alder bond is used for reversible crosslinking of the polycaprolactone with a specific molecular weight, so that the melt viscosity of the polycaprolactone polymer can be significantly reduced and the processability of the polycaprolactone polymer can be improved on the premise of ensuring the mechanical properties of the material, and the material can be repeatedly processed and reused.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a low-viscosity reversible cross-linked polycaprolactone and its preparation method and application. Background technique [0002] Polycaprolactone (PCL) has certain rigidity and strength, and has good compatibility with polymer materials. At the same time, it also has good biodegradability and shape memory function, so it has a wide range of application prospects. However, the insufficient mechanical strength of PCL limits its application and development. In order to overcome this shortcoming of PCL, it has been modified accordingly: [0003] 1) Filling modification of inorganic particles (such as Chinese patent CN110643028A): the filling of inorganic particles requires a certain content, but under the filling of ultra-high content fillers, due to the interaction between fillers and the interaction between fillers and polymer molecular chains The effect greatly r...

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Problems solved by technology

However, these methods cannot fundamentally solve the problem of high viscosity of the polymer system caused by high filling, and there is a problem of additive precipitation

[0004] 2) Cross-linking modification: Among all the structural factors affecting the rheological behavior of polymers, molecular weight is the most important. Polymers with small molecular weights have low melt viscosity and good fluidity, but as the molecular weight becomes smaller, the mechanical properties of polymers It also gradually becomes weaker, and even has no mechanical strength. For this reason, there is a method of cross-linking to bond molecular chains to reinforce (such as Chinese patent CN107254186A), but the cross-linked material cannot be dissolved and melted again, and the material cannot be reprocessed. Brings up the recycling problem

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