A preparation method of a fluoropolymer processing aid. The preparation method comprises the following steps: simultaneously adding ε-caprolactone and a fluoropolymer elastomer into a reactor, and heating to completely dissolve the fluoropolymer elastomer; and then cooling, adding polyol, mixing thoroughly, and adding an organotin catalyst to carry out a polymerization reaction; and after the reaction is finished, carrying out cooling, pulverizing or spray granulation so as to obtain the fluoropolymer processing aid. The processing aid prepared by using the method can reduce the extrusion pressure of a polymer during extrusion, improve the processing efficiency, improve the phenomena of melt rupture and “sharkskin” during polymer extrusion, and effectively enhance the surface quality of a product. Compared with the prior art, the processing aid of the invention has the characteristics of uniform dispersed particle size during polymer processing, no coking at a die head during long-time polymer extrusion processing, etc.

The present disclosure relates to a catalyst system to produce crystallizable polyester compositions which comprise residues of terephthalic acid, neopentyl glycol (NRG), 1,4-cyclohexanedimethanol (CHDM), ethylene glycol (EG), and diethylene glycol (DEG), in certain compositional ranges having certain advantages and improved properties including recyclability.

An end and monomer functionalized poly(propylene fumarate) polymer and methods for preparing this polymer, comprising isomerized residue of a maleic anhydride monomer and a functionalized propylene oxide monomer according to the formula: ##STR00001## where n is an integer from more than 1 to 100; R is the residue of an initiating alcohol having a propargyl, norbornene, ketone or benzyl functional group; and R′ is a second functional group selected from the group consisting of propargyl groups, 2-nitrophenyl groups, and combinations thereof are disclosed. The end and monomer functional groups allow for post-polymerization modification with bioactive materials using “click” chemistries and use of the polymer for a variety of applications in medical fields, including, for example, 3-D printed polymer scaffold.

Provided are integrated processes for the conversion of ethylene oxide to polypropiolactone. System for the production of polypropiolactone are also provided.

Novel processes of preparing block polyester copolymers while precisely controlling the stereoconfiguration (e.g., tacticity), chemical composition and/or length of each unit (block) are provided. Block polyester copolymers featuring desirable combinations of two or more blocks featuring different stereoconfiguration (e.g., tacticity), chemical composition and/or length, including triblock, tetrablock and higher block copolymers are also provided. A novel family of organometallic magnesium complexes and uses thereof in preparing polyesters and block polyester copolymers are also provided.

Provided are integrated processes for she conversion of ethylene oxide to polypropiolactone. Systems for the production of polypropiolactone are also provided.

A method for synthesizing an aliphatic polyester block copolymer regulated by carbon monoxide. The method uses an organic cobalt metal complex as a convertible catalyst and includes: first regulating an anionic ring-opening copolymerization reaction between an aliphatic acid anhydride and an epoxy compound; then using carbon monoxide as a conversion agent for conversion to obtain a catalyst having a new catalytic active site; and regulating a vinyl monomer to perform active free radical polymerization to obtain an aliphatic polyester block copolymer having a controllable structure. The described synthesis method uses a convertible catalyst and a conversion agent, combines two controllable polymerization reactions which have different but compatible mechanisms, and obtains a block copolymer by means of a “one-pot” reaction.

A method for synthesizing an aliphatic polyester block copolymer regulated by carbon monoxide. The method uses an organic cobalt metal complex as a convertible catalyst and includes: first regulating an anionic ring-opening copolymerization reaction between an aliphatic acid anhydride and an epoxy compound; then using carbon monoxide as a conversion agent for conversion to obtain a catalyst having a new catalytic active site; and regulating a vinyl monomer to perform active free radical polymerization to obtain an aliphatic polyester block copolymer having a controllable structure. The described synthesis method uses a convertible catalyst and a conversion agent, combines two controllable polymerization reactions which have different but compatible mechanisms, and obtains a block copolymer by means of a “one-pot” reaction.

A method for synthesizing an aliphatic polyester block copolymer regulated by carbon monoxide. The method uses an organic cobalt metal complex as a convertible catalyst and includes: first regulating an anionic ring-opening copolymerization reaction between an aliphatic acid anhydride and an epoxy compound; then using carbon monoxide as a conversion agent for conversion to obtain a catalyst having a new catalytic active site; and regulating a vinyl monomer to perform active free radical polymerization to obtain an aliphatic polyester block copolymer having a controllable structure. The described synthesis method uses a convertible catalyst and a conversion agent, combines two controllable polymerization reactions which have different but compatible mechanisms, and obtains a block copolymer by means of a “one-pot” reaction.

A method for synthesizing an aliphatic polyester block copolymer regulated by carbon monoxide. The method uses an organic cobalt metal complex as a convertible catalyst and includes: first regulating an anionic ring-opening copolymerization reaction between an aliphatic acid anhydride and an epoxy compound; then using carbon monoxide as a conversion agent for conversion to obtain a catalyst having a new catalytic active site; and regulating a vinyl monomer to perform active free radical polymerization to obtain an aliphatic polyester block copolymer having a controllable structure. The described synthesis method uses a convertible catalyst and a conversion agent, combines two controllable polymerization reactions which have different but compatible mechanisms, and obtains a block copolymer by means of a “one-pot” reaction.