2425-41-4Relevant articles and documents
Block copolymer materials from the organocatalytic ring-opening polymerization of a pentaerythritol-derived cyclic carbonate
Brannigan, Ruairi P.,Walder, Anthony,Dove, Andrew P.
, p. 2279 - 2286 (2014)
9-Phenyl-2,4,8,10-tetraoxaspiro[5,5]undecanone (PTO) was synthesized from pentaerythritol via the acid-catalyzed acetal formation reaction with benzaldehyde and subsequent ring closure with ethyl chloroformate. The cyclic carbonate monomer was subsequently polymerized by ring-opening polymerization (ROP) initiated from 1,4-butanediol (1,4-BDO) using the 1-(3,5- bis(trifluoromethyl)phenyl)-3-cyclohexylthiourea and 1,8-diazabicyclo[5.4.0] undec-7-ene dual organocatalytic system. It was found that the organocatalyst allowed for the synthesis of well-defined polymers with minimal adverse side reactions and low dispersities. This system was then employed in the ROP of PTO initiated from an α,ω-dihydroxy poly(caprolactone) (PCL) macroinitiator, with varying molecular weights, to yield a series of A-B-A block copolymers. These materials were characterized by 1H NMR spectroscopy, gel permeation chromatography, differential scanning calorimetry, thermogravimetric analysis and tensile analysis. It was found that the chain extension from PCL with poly(PTO) (PPTO) blocks yielded a thermoplastic material with superior tensile properties (elongation and Young's modulus) to that of the PCL homopolymer. Furthermore, it was noted that the addition of PPTO could be employed to alter the crystallization properties (crystallization temperature (Tc), and percentage crystallization) of the central PCL block.
Synthesis of biocompatible tadpole-shaped copolymer with one poly(ethylene oxide) (PEO) ring and two poly(ε-caprolactone) (PCL) tails by combination of glaser coupling with ring-opening polymerization
Fan, Xiaoshan,Huang, Bing,Wang, Guowei,Huang, Junlian
, p. 2890 - 2896 (2012)
The biocompatible tadpole-shaped copolymers [cyclic-poly(ethylene oxide) (PEO)]-b-[linear poly(ε-caprolactone) (PCL)]2 [(c-PEO)-b-PCL2] with one PEO ring and two PCL tails were synthesized by combination of glaser coupling with ring-opening polymerization (ROP). First, a linear PEO precursor with two alkyne groups at the chain terminal and two hydroxyl groups at the chain middle was prepared by ROP of EO monomer and the following transformation of functional groups. Then, cyclic PEO with two hydroxyl groups at the same site was obtained by the "Glaser" cyclization. Finally, the hydroxyl groups on cyclic PEO directly initiated the ROP of ε-CL monomer to produce the target copolymers (c-PEO)-b-PCL 2. The target copolymers and intermediates were all well characterized by GPC, MALDI-TOF MS, 1H NMR and FT-IR.
A compound, said compound and catalyst solid catalyst component
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Paragraph 0059; 0060, (2018/02/04)
The invention discloses a compound with a novel structure. The structure of the compound is represented by formula (I); and in the formula (I), R1 to R4 can be same to or different from each other and are independently selected from substituted or non-substituted C1-C20 alkyl groups, and preferably substituted or non-substituted C1-C10 aliphatic groups, C3-C10 cycloalkyl groups, C6-C20 aryl groups and C7-C20 alkaryl groups, and R3 and R4 can be optionally connected to form a ring. The compound represented by formula (I) can be used as an internal electron donor compound to obtain a catalyst with excellent comprehensive performances. The catalyst can be used in olefin polymerization, especially propylene polymerization to obtain a satisfactory polymerization yield, has good hydrogen sensitivity and high stereospecificity, and is in favor of developing different types of polymers.
A new having glucoskeleton threotol Pentaphenol alkylalkoxysilane compd. contg., using the same and its intermediate surface modifying agent
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Paragraph 0050-0052, (2018/10/16)
PROBLEM TO BE SOLVED: To provide a novel surface modifier having high solubility to various organic solvents and excellent water repellency and oil repellency without containing a long-chain perfluoroalkyl group which is a problem in terms of environment and to provide an intermediate thereof.SOLUTION: There are provided a compound intermediate represented by the following general formula (1): [HCFCFOCH]C[CHOH](1) (where m is 2 or 3 and n is an integer satisfying 4-m), a fluorine-containing alkoxysilane compound represented by the following general formula (2): [HCFCFOCH]C[CH-X-Y-Si(OR)](2) (where m and n are the same as in general formula (1); X is a linking group representing an intermolecular interaction; Y is an alkylene group having 1 to 12 carbon atoms; and Ris an alkyl group having 1 to 6 carbon atoms) which is derived from the intermediate; and a surface modifier containing the fluorine-containing alkoxysilane compound as a constituent component.
