Stretching-Regulated Homogenization of Lamellae Thickness in Biaxially Oriented Polypropylene Capacitor Films, and Its Effect on Breakdown Strength.

Stretching fields give rise to the formation of reinforcing crystals in biaxially oriented polypropylene capacitor films, endowing them with excellent electrical properties. In this paper, the correlation between stretching temperature, ratio, and annealing temperature and film structure as well as electric breakdown strength (E) during biaxial stretching is investigated. Synchronous biaxial stretching ensures that the orientation of the prepared films is isotropic.

Exploration of multifunctional wood coating based on an interpenetrating network system of rosin-CO-based polyurethane and mussel bionic rosin-based benzoxazine.

Polyurethane (PU) prepared by blending rosin base and CO-polyol already has good mechanical properties and hydrophobic effect and has powerful benefits in acid and alkali resistance and salt resistance. In this study, mussel bionic rosin-based benzoxazine (BZ) was synthesized using dehydroabietylamine, catechol, and paraformaldehyde. Mixing BZ into PU can endow the resulting PU/BZ with special effects such as zero curing shrinkage, excellent mechanical behavior, and flame retardancy through a 3D interpenetrating network system.

Novel dopamine-modified cellulose acetate ultrafiltration membranes with improved separation and antifouling performances.

Cellulose acetate (CA) is widely used in the preparation of ultrafiltration membranes due to its many excellent characteristics, especially chemical activity and biodegradability. To improve the inherent hydrophobic and antifouling properties of CA membrane, in this work, CA was successfully modified with dopamine (CA-2,3-DA) through selective oxidation and Schiff base reactions, which was confirmed by FTIR and H NMR measurements. Then, CA-2,3-DA membrane with high water permeability and excellent antifouling property was prepared by the phase inversion method.

Development and investigation of novel antifouling cellulose acetate ultrafiltration membrane based on dopamine modification.

In this contribution, a novel cellulose acetate modified with dopamine (CA-DA) membrane material was designed and prepared by a two-step route consist of chlorination and further substitution reactions. The chemical structure of the prepared CA-DA material was determined by FTIR and H NMR, respectively. The CA-DA ultrafiltration membrane was subsequently fabricated by the scalable phase inversion process.