Preparation method of polycaprolactone crystal
A polycaprolactone and crystal technology, which is applied in the field of polycaprolactone crystal preparation, can solve the problems of severe crystallization conditions and great influence on the performance of PCL films, and achieves the effect of a simple method.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0025] The invention provides a method for preparing polycaprolactone crystals, which comprises the steps of: preparing a polycaprolactone-polyvinyl chloride blend film; and forming a polycaprolactone crystal. A detailed description is given below.
[0026]
[0027] Polycaprolactone, polyvinyl chloride and a solvent are formed into a blending solution. Specifically, polycaprolactone and polyvinyl chloride are mixed with a solvent to obtain a blended solution.
[0028] The solvent is tetrahydrofuran or 2-methyltetrahydrofuran, preferably, the solvent is tetrahydrofuran. In the blend solution, the total mass fraction of polycaprolactone and polyvinyl chloride is 4.5-5.5 wt %, preferably 4.7-5.3 wt %, and more preferably 5.0-5.3 wt %.
[0029] In the blended solution, the mass ratio of polycaprolactone and polyvinyl chloride is 70-80:20-30, preferably 70-75:20-30; more preferably 70-75:25-30. This facilitates the formation of polycaprolactone crystals in which a-axis orienta...
preparation example 1-
[0054] Preparation Example 1 - Preparation of Polycaprolactone-PVC Blended Film
[0055] (1) Disperse polycaprolactone and polyvinyl chloride with a mass ratio of 70:30 in tetrahydrofuran, and stir at a stirring rate of 600 r / min at 40° C. for 6 h to obtain a total of polycaprolactone and polyvinyl chloride. The mass fraction is 5wt% of the blended solution.
[0056] (2) Spread the above blended solution evenly in a 75ml petri dish; dry it in a vacuum drying oven, dry at 35°C and a vacuum of 0.1MPa for 48h, and gently peel off the blended film from the petri dish , to obtain a polycaprolactone-polyvinyl chloride blend film with a thickness of 100 μm. The above-mentioned polycaprolactone-polyvinyl chloride blend film was passed through a dumbbell-shaped stretch spline die and a pneumatic punching machine to form a dumbbell-shaped polycaprolactone-polyvinyl chloride blend film.
Embodiment 1
[0058] The dumbbell-shaped polycaprolactone-polyvinyl chloride blend film obtained in Preparation Example 1 was fixed on a stretching machine and placed in an infrared spectrometer for scanning; then the dumbbell-shaped polycaprolactone-polyvinyl chloride film was The blended film was heated to 100°C at a heating rate of 20°C / min and kept for 20min;
[0059] The dumbbell-shaped polycaprolactone-polyvinyl chloride blend film was cooled with liquid nitrogen, and rapidly cooled to 40°C at a cooling rate of 60°C / min;
[0060] Immediately, the polycaprolactone-polyvinyl chloride blend film was stretched at 40 °C with a stretching rate of 100 μm / s and a stretching ratio of 4, and isothermally crystallized at 40 °C for 750 min to obtain polycaprolactone crystals.
PUM
| Property | Measurement | Unit |
|---|---|---|
| Thickness | aaaaa | aaaaa |
| Stretch temperature | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More