Introduction of polycaprolactone PCL in biodegradation field

Under the current global “plastic ban” background, it is well known that biodegradable materials are the general trend, and PCL, as a biodegradable material (molecular structure formula is as follows), has been better applied in the field of biodegradation.

PCL is a semi-crystalline polymer with a melting point of 60 °C and a Tg of about -60 °C. There are five non-polar methylene CH2- and one polar ester group -C00- on its repeating structural unit. The C-C and C-O bonds in the subchain can rotate freely. The existence of ester group in the molecular chain makes polycaprolactone have good biocompatibility and can be completely biodegradable with appropriate degradation rate.

ε-caprolactone monomer in active hydrogen initiation system, cationic catalyst, anionic catalyst, coordination polymerization catalyst under the catalysis of ring-opening polymerization of polymer organic polymer, through the control of polymerization strips, can obtain different molecular weight.

Active hydrogen initiation system

Water, alcohol, acid and other compounds containing active hydrogen can trigger the ring-opening polymerization of ε-CL, and the reaction rate is slow and necessary

At higher temperatures (generally 200 °C to 250 °C), the molecular ends of the polymerization products contain hydroxyl groups.

Cationic catalytic system

Cationic catalysts for ε-CL ring-opening polymerization include methyl fluorosulfonic acid, ethyl fluorosulfonic acid and methyl nitrobenzene sulfonate| acid, methyl methylate, etc.

Anionic catalyst

The mechanism of anion-catalyzed ring-opening polymerization of lactone is that the negative ions attack carbonyl carbon, and then the acyl-oxygen bond breaks

The ring further forms a chain growth reaction.

Complexation catalyst energy

There are mainly alkyl or alkoxy compounds, rare earth compounds, etc. At present, the focus of research is on rare earth synthesis

Thing.

On the other hand, because the biodegradable material PLA, which has been widely used in the field of biodegradable films, has been rising in price in recent years with the tight market supply. According to market feedback, due to supply and cost considerations, in the biodegradable film industry, some companies have begun to look for other biodegradable materials to partially replace PLA for production use. Among these materials, PCL and PBAT, as two kinds of polymer materials with good toughness, can play their own characteristics in the field of biodegradable films.

The blending modification of PCL and PBAT has a good application prospect in the field of fully degraded films. Among them, PCL can give this blend modified film better functionality, in the following four aspects:

1). Improve heat sealing performance

The high crystallinity and low melting point of PCL enable the film to produce viscosity without too high activation temperature, which is conducive to improving the heat sealing property of the film material. This good feature is expected to make PCL widely used as a heat-sealing functional layer in supermarket shopping bags, environmental protection packaging materials, protective film substrates, etc.

2). Unity of stiffness and toughness

Due to its unique shape memory function, PCL material can effectively reduce the crease after multiple bending.

3). Good processing performance

The blending of PCL and PBAT can significantly reduce the processing temperature of the material and reduce energy consumption;

4). Good degradation

PCL is not only suitable for household composting, but also for seawater degradation environment.

In addition, PCL used in the PBAT blending system can also improve the transparency and low temperature resistance of the film.

Uli-ECO makes good use of the above excellent characteristics of PCL, such as good toughness, improved thermal sealing of materials, and seawater degradation, etc., and independently developed and produced thin-film grade suitable for the production process of PCL film floor blowing film, without inorganic powder and other auxiliary materials.

In addition, biomedical polycaprolactone has low temperature molding and strong plasticity; Has a certain memory function, can be reused: and excellent

The bonding function is biodegradable, environmentally friendly, non-toxic, good skin affinity, very good for drug penetration, and in

In vivo, it has good compatibility with biological cells, the cells can grow normally on their substrates, and can be degraded into CO2 and CO2

H2O. In the surgical field can be used for low temperature orthopaedic splints, radiotherapy plates, resin bandages, dental mold, completely can fall

Unplastic surgical sutures, controlled release drug carriers, cell and tissue culture frames.

 

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Unilong®️ Group specializes in the research, development, production and operation of biological materials and green solvents. It is a high-tech enterprise integrating the research, development and production of new environmentally friendly and degradable materials.

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