Abstract:
Disclosed are a method for preparing a modified biodegradable polymer by using various additives and plasticizers in a biodegradable polymer which is non-toxic to human bodies, a biodegradable polymer prepared therefrom, and a biodegradable stent prepared by using the biodegradable polymer. Specifically, it is possible to reduce a decrease in molecular weight resulting from a thermal degradation occurring during the solid-phase molding processing of a biodegradable polymer by coating a solution in which various additives are dissolved during the modification of the biodegradable polymer to convert the hydroxyl end group into a functional group of a carboxylic group or a different kind of hydroxyl group.
Abstract:
A polymer is synthesized by mixing with an Low-Density Polyethylene (LDPE) a waste material of paper tissue (WMPT), at least one antimicrobial agent, nano cellulose and nano bentonite. Optionally, a nanocomposite suspension is added.
Abstract:
Disclosed is a polymerizable composition for an optical material containing polyisocyanate (a) which is obtained from a plant-derived raw material and includes a modified product of aliphatic polyisocyanate, and polyol (d) which is a plant-derived compound.
Abstract:
Provided herein is a cellulose nanofiber-containing composition producing method for producing a cellulose nanofiber-containing composition that can be easily combined with compounds having a reactive double-bond group, and that contains only a small amount of uncured material that acts as a plasticizer in a molded product, using a simple producing method that does not require any process involving solvent displacement or solvent removal. A high-strength molded body prepared by using the cellulose nanofiber-containing composition is also provided. In refining cellulose in a mixture containing a compound having a reactive double-bond group and a hydroxyl group of 10 KOHmg/g or less and a defibrating resin as essential components, the cellulose has a moisture content of 4 to 25 parts by mass with respect to 100 parts by mass of the amount of the cellulose converted on the assumption that the percentage moisture of the cellulose is 0%.
Abstract:
A method of forming a compatibilized polymeric blend may include providing a polyolefin that includes a propylene heterophasic copolymer. The polyolefin may have an ethylene content of at least 10 weight percent based on a total weight of the polyolefin. The method may include melt blending the polyolefin with a polylactic acid and a reactive modifier to form the compatiblized polymeric blend. The reactive modifier may be a glycidyl methacrylate grafted polypropylene (PP-g-GMA). The reactive modified may be produced by contacting a polypropylene, a glycidyl methacrylate, a multifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of PP-g-GMA having a grafting yield in a range from 1 wt. % to 15 wt. %.
Abstract:
The composition comprises a mixture of: i) poly(L-, D-lactide) homopolymer and, optionally, poly(ε-caprolactone) homopolymer, and ii) poly(L-lactide) and poly(ε-caprolactone) diblock copolymer, where said copolymer has a molar mass of the L-lactide block of 20,000 g/mol to 200,000 g/mol and a molar mass of the ε-caprolactone block of 10,000 g/mol to 100,000 g/mol, with the molar ratio between the L-lactide block and the ε-caprolactone block of 2:1. The invention also refers to the nanostructured material obtained from this composition that is characterised by a nanostructure of two mutually self-assembled phases, one phase being formed by a polymeric matrix of poly(L-, D-lactide) units and the other phase by poly(ε-caprolactone) units self-assembled with the matrix and also its use for the manufacture of a plastic article in the form of a transparent film or thin sheet.
Abstract:
The disclosure relates to biodegradable polyether network polymers crosslinked via ester linkages, to substrates, implants and scaffolds comprising the biodegradable polyether network polymers, to methods for preparing such network polymers, implants and scaffolds, and to methods of using substrates, implants and scaffolds comprising the network polymers, particularly for culturing cells and regenerating tissue.
Abstract:
A polyhydroxyalkanoate composition, having a an elongation at break (ASTM D648) greater than 3%, an impact resistance (IS0179 1 eA, 23° C., unnotched) greater than 18 KJ/m2 and a flexural modulus of at least 950 MPa, includes at least 25% wt of a polyhydroxyalkanoate component (I); from 5 to 40% wt of one or more thermoplastic polymers as a non-polyhydroxyalkanoate component (II); from 0 to 40% wt of one or more fillers (III); from 0 to 20% wt of one or more plasticizers (IV); and from 0 to 10% wt of one or more additives (V). The polyhydroxyalkanoate composition can be used for the preparation of durable goods that may be labelled as containing more than 20% non-fossil carbon, and for articles prepared therefrom.
Abstract:
The present invention relates to biodegradable hydrophobic composite materials and a process for the preparation of said hydrophobic biodegradable materials from the seaweed polysaccharides through grafting reaction with vinylated monomers e.g. vinyl acetate. The said composites can be used as a substitute for synthetic ropes for varied applications including seaweed cultivation in the open sea. The results of cultivation experiments showed that ropes are suitable for cultivation of seaweeds in the sea environment, and exhibit higher biomass yield as compared to synthetic ropes. The prepared composites are very flexible and can be used for making handles for carry bags and for the preparation of biodegradable designs, bowls, pots, jars, gift items, stud caps and bracelets.
Abstract:
An object is to improve both slow crystallization and brittleness that are drawbacks of polyhydroxyalkanoates, so that processability in mold processing, such as injection molding, is improved, processing speed is increased, and ductility is imparted to a resulting molded article. Provided is an aliphatic polyester resin composition including a polyhydroxyalkanoate (A), an ethylene-vinyl acetate copolymer resin (B), and pentaerythritol (C), wherein the ethylene-vinyl acetate copolymer resin (B) has a vinyl acetate content of 65 to 95 wt %, and the polyhydroxyalkanoate (A) and the ethylene-vinyl acetate copolymer resin (B) are compatible.