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Sn 2-ethylhexanoate

Many factors, such as molecular weight, moisture, residual and hydrolyzed monomers, oligomers, and residual metals from polymerization catalysts, have been reported to influence PLLA thermal decomposition. In particular, the effect of polymerization catalysts, such as Sn, Zn, and Al compounds, is important. The Sn catalyst is of special importance because only Sn 2-ethylhexanoate (Sn(Oct)2) is approved by the FDA as a catalyst for food contact PLA applications [39]. [Pg.404]

Sta.nnous2-Ethylhexa.noa.te, Stannous 2-ethyIhexanoate, Sn(CgH 302)2 (sometimes referred to as stannous octanoate, mol wt 405.1, sp gr 1.26), is a clear, very light yellow, and somewhat viscous Hquid that is soluble in most organic solvents and in siHcone oils (166). It is prepared by the reaction of stannous chloride or oxide with 2-ethylhexanoic acid. [Pg.75]

Two different mechanisms have been proposed for the ROP of (di)lactones depending on the nature of the organometalhc derivatives. Metal halides, oxides, and carboxylates would act as Lewis acid catalysts in an ROP actually initiated with a hydroxyl-containing compound, such as water, alcohol, or co-hydroxy acid the later would result more hkely from the in-situ hydrolysis of the (di)lac-tone [11]. Polymerization is assumed to proceed through an insertion mechanism, the details of which depends on the metal compound (Scheme la). The most frequently encountered Lewis acid catalyst is undoubtedly the stannous 2-ethylhexanoate, currently referred to as stannous octoate (Sn(Oct)2). On the other hand, when metal alkoxides containing free p-, d-, or f- orbitals of a favo-... [Pg.6]

Figure 6.2.15 Half-life isocyanate concentration in the reaction of 1,6-hexamethylene diisocyanate trimer with alcohols. (1.12 mol/l NCO) in xylene. Molar ratio NCO/OH 1/1. Catalyst concentration DBTDL 0.014% Sn Zr Chelate 0.014% Zr Bi carboxylate 0.13% Bi Zn octanoate 0.27 % Zn on total reactants. HE = hydroxyethylester, HE Carbamate = B-hydroxyethyl carbamate, TMP= methoxytripropylene glycol, Zn oct = Zn 2-etbylbexanoate, Bi carb = Bi 2-ethylhexanoate, Zr CH = Zr dionate complex... Figure 6.2.15 Half-life isocyanate concentration in the reaction of 1,6-hexamethylene diisocyanate trimer with alcohols. (1.12 mol/l NCO) in xylene. Molar ratio NCO/OH 1/1. Catalyst concentration DBTDL 0.014% Sn Zr Chelate 0.014% Zr Bi carboxylate 0.13% Bi Zn octanoate 0.27 % Zn on total reactants. HE = hydroxyethylester, HE Carbamate = B-hydroxyethyl carbamate, TMP= methoxytripropylene glycol, Zn oct = Zn 2-etbylbexanoate, Bi carb = Bi 2-ethylhexanoate, Zr CH = Zr dionate complex...
Another very useful class of reducing agents which can be used are Sn(II) carboxylates(13). In the presence of a Cu(II) catalyst, Sn(II)-2-ethylhexanoate quantitatively catalyzes the decomposition of dlaryllodonlvim salts. Model reactions have shown that the Initial step In this reaction Is the facile reduction of Cu(II) to Cu(I) by the Sn(II) compound as depicted In Equation 16. [Pg.202]

Pd-Sn / C catalyst is obtained by adding to a solution of 2.44 g palladium (II) acetate (10 mmol, Johnson-Matthey), 9.82 g of potassium acetate (100 mmol) in 400 ml acetic acid firstly 20 g of Ceca 3S charcoal (optionally treated with concentrated nitric acid according to known procedure (ref. 9b)) and then 16.1 g tin (II) 2-ethylhexanoate (39,75 mmol, Strem). The suspension is vigourously stirred and heated at 100°C for 4 hours. After cooling, the catalyst is recovered by filtration, washed with acetic acid and water and dried 5 hours under reduced pressure (50 mbar) at 50°C (Pd 4,3 % Sn 27c). [Pg.389]

Styrene (St) (Aldrich, 99%) was used as received and /-butyl aciylate (/BA) (Aldrich, 99%) was passed through a column filled with basic alumina. Tris(2-dimethylaminoethyl)amine (MceTREN, 99 %) and tris(2-pyridylmethyl)amine (TPMA, 99 %) are commercially available from ATRP Solutions Inc (www.atrpsolutions.com). ATHPpare resin (ATRP Solutions Inc.), diethyl 2-bromo-2-methylmalonate (DEBMM) (Aldrich, 98%), copper(ll) bromide (Aldrich, 99%), tin(ll) 2-ethylhexanoate (Sn(EH)2) (Aldrich, 95%), N,N-dimethylformamide (DMF) (Aldrich, 99%), methylene chloride (Fisher Scientific), trifluoroacetic acid (TFA) (Aldrich, 99%) and 2,2 -azo-bis(isobutyronitrile) (AIBN) (Aldrich, 99%) were used as received. Fc203 particles (size < 50 nm) were purchased form Aldrich. [Pg.352]

Sn(II) 2-ethylhexanoate, which has been approved for surgical and pharmacological applications by the FDA, is generally employed as the catalyst for the synthesis of biomedical polymers. However, it has been reported that Sn(II) 2-ethylhexanoate cannot be removed by a purification process such as the dissolution/precipitation method, thus the residual Sn may be concentrated within matrix remnants after hydrolytic degradation (2). To avoid the potential harmful effects of metallic residues in biomedical polymer materials, enzymatic polymerization is one of the powerful candidates for polymer synthesis (3). Enzymes, natural kinds of protein without toxicity, have remarkable properties... [Pg.144]

Stannous octoate (Sfannoos 2-ethylhexanoate), Sn[OOCCH(C2Hs)CH2CH2CH2-CH3]2. MoI. wt. 405.11. Suppliers Albright and Wilson Metal and Thermit Corp. (Catalyst T9) ROC/RTC. [Pg.177]

To prepare the CNT/MOX liquids for spin-coating, the SWCNT bundles were dispersed in the organometallic solutions (Sn [OOCCH(C2H5)-QH9]2,aq. tin (H) 2-ethylhexanoate -90% in 2-ethylhexanoic acid) by ultrasonic vibration. Alternatively, MWCNTs bundles with Sn02 nanoparticles and cetyltrimethyl ammonium bromide can be dispersed in water. ° In... [Pg.392]

Choi and co-workers synthesized 6-amino-1-hexanol-immobilized SWCNTs by immersing the acyl chloride-functionalized SWCNTs into a DMF solution of 6-amino-1-hexanol for 12 h, and grafted poly(p-dioxanone) (PDX) from the SWCNT surfaces by in situ ROP in toluene at 100 °C for 3 days with tin(II) 2-ethylhexanoate [Sn(Oct)2] as the catalyst. The 10% weight-loss temperature of grafted polymer is higher than that of free polymer by approximately 20 °C. [Pg.149]

Synonyms Sn-(ll)-ethylhexanoate Stannous 2-ethylhexanoate Stannous-2-ethylhexoate Tin octoate Tin-(ll)-octoate Empiricail CjsFIsoQiSn Formula Sn(C8H,sQ2)2... [Pg.1360]

Ethylhexanediol 2-Ethyl-1,3-hexanediol 2-Ethylhexane-1,3-diol 2-Ethylhexanediol-1,3. See Ethyl hexanediol Ethyl hexanoate. See Ethyl caproate Sn-(ll)-ethylhexanoate. See Stannous octoate 2-Ethylhexanoic acid a-Ethylhexanoic acid. [Pg.1742]

Catalyst Systems A vast number of catalysts have been utilized in the ROP of lactide, of which the most studied are the carboxylates and alkoxides of Sn [111-120] and A1 [121-127]. Of these, stannous 2-ethylhexanoate (tin octanoate) is the most intensively studied. The polymerization mechanism is suggested to involve a preinitiation step, in which stannous 2-ethylhexanoate is converted to a stannous alkoxide by reaction with a hydroxyl-bearing compound. Then, the polymerization proceeds on the tin-oxygen bond of the alkoxide ligand, whereas the carboxylate itself is... [Pg.39]

Tin(II) 2-ethylhexanoate, commonly referred to as stannous octoate (Sn(Oct)2), is the most frequently used catalyst in the ROP and copolymerization of cyclic heterocyclic monomers including cyclic carbonates due to a high activity as well as an approval by the American Food and Drug Administration (FDA) as a food additive. The mechanism of polymerization with its contribution has been widely discussed. Sn(Oct)2 is not thought to be the actual initiator since the molecular weight does not depend on the monomer/Sn(Oct)2 molar ratio. [Pg.269]

Cyclic phosphates (12) were also polymerized using alcohol and/or macro initiators with hydroxy end groups as the initiators and tin(II) 2-ethylhexanoate (stannous octoate (Sn(Oct)2)) as catalyst, usually in THF at 30-40 °C or in bulk at 90 In long-term polymerization of structure 12 with... [Pg.479]


See other pages where Sn 2-ethylhexanoate is mentioned: [Pg.148]    [Pg.152]    [Pg.115]    [Pg.142]    [Pg.142]    [Pg.315]    [Pg.274]    [Pg.148]    [Pg.152]    [Pg.115]    [Pg.142]    [Pg.142]    [Pg.315]    [Pg.274]    [Pg.44]    [Pg.186]    [Pg.19]    [Pg.42]    [Pg.48]    [Pg.68]    [Pg.289]    [Pg.221]    [Pg.1]    [Pg.35]    [Pg.406]    [Pg.11]    [Pg.1809]    [Pg.11]    [Pg.645]    [Pg.19]    [Pg.32]    [Pg.350]    [Pg.196]    [Pg.96]    [Pg.107]    [Pg.214]   
See also in sourсe #XX -- [ Pg.14 , Pg.404 ]




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Ethylhexanoate

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