Showing papers on "Polytetrahydrofuran published in 2007"
TL;DR: In this article, a new family of crosslinked polyurethanes was synthesized and characterized as shape-memory polymers, which are linked together by macrodiol soft segments formed from either polytetrahydrofuran with molar mass of 650, 1000 or 2000 ǫgǫm
121 citations
TL;DR: Partially 2,3-O-methylated amyloses efficiently form inclusion complexes with polytetrahydrofuran and poly(epsilon-caprolactone) by simply mixing them in DMSO-H(2)O (1 : 9) solution, in contrast to the case of the parent amylose.
59 citations
TL;DR: In this article, a polyrotaxane possessing cyclodextrin wheels was prepared in one pot through the initial threading complexation of polytetrahydrofuran axle and α-cyclodesxtrin wheel followed by the end-capping react...
Abstract: Polyrotaxane possessing cyclodextrin wheels was prepared in one pot through the initial threading complexation of polytetrahydrofuran axle and α-cyclodextrin wheel followed by the end-capping react...
28 citations
TL;DR: In this article, the linear hyperbranched block copolymers were synthesized, in which the linear polytetrahydrofuran (PTHF) is linked to the apex of hyperbranched poly(phenylene sulfide) (HPPS-SH).
Abstract: The linear-hyperbranched block copolymers, in which the linear polytetrahydrofuran (PTHF) is linked to the apex of hyperbranched poly(phenylene sulfide) (HPPS-SH), have been synthesized, and the synthesis includes condensation polymerization of 2,4-dichlorobenzenethiol, subsequent transformation of the resultant HPPS-SH to HPPS-OH, and then the cationic ring-opening polymerization of tetrahydrofuran (THF) using HPPS-OH as a macrotransfer agent and BF 3 ·OEt 2 as a catalyst. The resultant HPPSs have excellent thermal stability, the PTHF and HPPS chains were decomposed at 361 and 402 °C, respectively. HPPS can be dissolved in THF in the form of aggregates with R h =90 nm, which is larger than that (R h = 55 nm) formed from the corresponding linear PTHF-HPPS block copolymer.
15 citations
TL;DR: In this article, a series of new optically active poly(amide-imide-ether-urethane)s (PAIEU)s based on polytetrahydrofuran (PTHF), of Mn=1000 as soft segment were synthesized.
Abstract: Two series of new optically active poly(amide-imide-ether-urethane)s (PAIEU)s based on polytetrahydrofuran (PTHF), of Mn=1000 as soft segment were synthesized. These copolymers were prepared via direct polycondensation reaction of an aromatic diacid based on L-leucine with preformed imide ring, 4,4’-methylene-bis-(4-phenylisocyanate) (MDI) and PTHF-1000. The effects of different reaction conditions and method of preparation (one-step vs. two-step method) on the physical properties of these new PAIEUs have been investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide angle X-ray scattering (WAXS), FTIR spectroscopy, and dynamic mechanical thermal analysis (DMTA). The effect of the introduction of bis(p-amido benzoic acid)-N-trimellitylimido-L-leucine (BPABTL) (1) into PU back-bone on their properties was also studied.
12 citations
TL;DR: Grafting reactions of polybutadiene with macro peroxy initiators and postpolymerization were studied in this paper, where the FTIR spectra of the crosslinked samples indicated the characteristic signals of the PTHF, PBD and PMMA blocks.
11 citations
Patent•
11 Apr 2007
TL;DR: In this article, the authors proposed a thermoplastics comprising plasticizer (i), wherein the plasticizer is an ester based on polytetrahydrofuran and on a monocarboxylic acid.
Abstract: Thermoplastics comprising plasticizer (i), wherein the plasticizer (i) is an ester based on polytetrahydrofuran and on a monocarboxylic acid.
10 citations
Journal Article•
TL;DR: In this article, a series of three polyurethane (PUs) based on a mixture of two polyols (polyethyleneadipate diol-PEA 2000 and polytetrahydrofuran PTHF 1400) was prepared.
Abstract: Polyester and polyether polyols have been used to manufacture high quality products since the earliest days of the polyurethane era. They are cost effective raw materials which impart excellent abrasion and solvent resistance, oxidative stability, tear and tensile strength to the polyurethane. In this report, a series of three polyurethane (PUs) based on a mixture of two polyols (polyethyleneadipate diol-PEA 2000 and polytetrahydrofuran PTHF 1400) was prepared. Diphenylmethane diisocyanate (MDI) was.utilized in the preparation of PUs. Ethylene glycol (EG) and Glycerin (Gly) were used as chain extenders. The physico-mechanical properties (hardness, stress-strain, resilience, and abrasion resistance) of this PUs were measured according to standard methods. Thermal analysis (TGA and DSC) were used for characterization. The structures were confirmed by infra-red analysis (IR).
9 citations
TL;DR: In this article, Friedel glycol and dibutyl tin dilaurate were used to degrade polyurethane fiber waste in order to extract polytetrahydrofuran.
Abstract: Diethylene glycol and dibutyl tin dilaurate were used to degrade polyurethane fiber waste in this paper. The glycolysis products were separated into two phases including white solid and brown liquid by a freezing process. The chemical structure and thermal property of the purified solid product were characterized by Fourier transform infrared (FTIR) spectrometer,1H nuclear magnetic resonance (1H NMR) and differential scanning calorimetry (DSC). The solid product was mainly polytetrahydrofuran. The analysis of the liquid product was carried out by FTIR and high performance liquid chromatography-electrospray ionization-mass spectrometry (HPLC-ESI-MS). The liquid phase included various components such as aromatic amine, diethylene glycol-propylene diamine compound and so on. The glycolysis mechanism of polyurethane fiber waste is also discussed in this paper.
9 citations
Patent•
25 May 2007
TL;DR: In this article, a process for preparing polytetrahydrofuran copolymers by polymerization of tetrahydrafuran in the presence of a telogen and/or a comonomer over a fixed bed of an acid catalyst is described.
Abstract: The present invention relates to a process for preparing polytetrahydrofuran or tetrahydrofuran copolymers by polymerization of tetrahydrofuran in the presence of a telogen and/or a comonomer over a fixed bed of an acid catalyst, in which the temperature of the polymerization mixture increases in the direction of flow through the catalyst bed.
6 citations
Patent•
24 Jan 2007
TL;DR: In this article, a thermoplastic polyurethane elastomer containing polyether and polypeptide block and its synthesis process is presented. And the synthesis process includes three steps: 1. reaction of amino acid or its derivative and bis (trichloromethyl) carbonate to produce alpha-amino-N-carboxyl lactonic anhydride; 2.initiating the ring-opening polymerization of alpha-amide N-Carboxyl LCA with polytetrahydrofuran with terminal amino radical as initi
Abstract: The present invention is thermoplastic polyurethane elastomer containing polyether and polypeptide block and its synthesis process. The synthesis process includes three steps: 1. reaction of amino acid or its derivative and bis (trichloromethyl) carbonate to produce alpha-amino-N-carboxyl lactonic anhydride; 2.initiating the ring-opening polymerization of alpha-amino-N-carboxyl lactonic anhydride with polytetrahydrofuran with terminal amino radical as initiator to produce three block pre-polymer; and 3.further in-situ reaction with diisocyanate and chain expanding agent 1, 4-butanediol or polytetrahydrofuran-1000 to synthesize the thermoplastic polyurethane elastomer. The polyurethane elastomer has excellent biocomplatibility, excellent biodegradability, excellent mechanical performance and convenient machining, and may be used in biomedicine.
Patent•
18 Jul 2007
TL;DR: In this article, a bimetallic cyanide catalyst for the ring-opening polymerization of epoxide has been revealed, which has a chemical general expression of Ma1[M2(CN)b]dxM3(X)cwH2OyTjL1zL2, where, L1 is polytetrahydrofuran oxyprpopyl olefin blocked polyether and L2 is polyether ester sulfate in the structure as shown.
Abstract: The present invention discloses one kind of bimetallic cyanide catalyst for the ring-opening polymerization of epoxide The catalyst has the chemical general expression of Ma1[M2(CN)b]dxM3(X)cwH2OyTjL1zL2, where, L1 is polytetrahydrofuran oxyprpopyl olefin blocked polyether and L2 is polyether ester sulfate in the structure as shown The present invention is used for the ring-opening polymerization of alkylene oxide and has high activity and other excellent performance
Patent•
27 Jun 2007
TL;DR: The polytetrafuran-base block polyether diol features its structural general expression of HO-[A1]a1]-CH2CH2 CH2O]n-[A2]a2-H as discussed by the authors.
Abstract: The polytetrafuran-base block polyether diol features its structural general expression of HO-[A1]a1-[CH2CH2CH2CH2O]n-[A2]a2-H, where, the structure unit A1 is CH(CH3)CH2O, CH(CH3)CH2OCH2CH2O or other ether structure, A2 is CH2CH(CH3)O, CH2CH2OCH2CH(CH3)O or other ether structure, a1 is the number of structure unit A1, a2 is the number of structure unit A2, a1 is near to or the same as a2, each of a1 and a2 is 1-35, and n is number of [CH2CH2CH2CH2O] and equal to 2-30. The polytetrafuran-base block polyether diol is liquid, has convenient use and low production cost, and may be used in preparing polyurethane with excellent performance similar to that of polytetrahydrofuran.
TL;DR: In this article, a combination-initiation polymerization process was proposed for light-induced polymerization of bisphenol F diglycidyl ether (BFDGE), 5,5′-dicarboxylic-7,7′ -dioxo-2,2′-spirodi(benzotetrahydrofuran) (DCSBL) and polytetrahylfuran (pTHF-250) was studied.
Abstract: The light-induced polymerization process of bisphenol F diglycidyl ether (BFDGE), 5,5′-dicarboxylic-7,7′-dioxo-2,2′-spirodi(benzotetrahydrofuran) (DCSBL) and polytetrahydrofuran (pTHF-250) was studied. 4-[(2-Hydroxytetradecyl)oxy]phenyl-phenyliodoniumhexafluoroantimonate, camphorquinone and ethyl 4-dimethylaminobenzoate were used as a photoinitiator system. The polymerization process was induced by light and monitored using Fourier transform infrared spectroscopy. A novel combination-initiation polymerization process was proposed: first, cationic copolymerization of BFDGE and pTHF-250 was initiated by the photoinitiator system and heat was released by this polymerization; then, copolymerization of BFDGE and DCSBL was induced by that heat while pTHF-250 served as an anionic initiator. Copyright © 2007 Society of Chemical Industry