Component Weight (%) LP90 (polyvinyl acetate in styrene) 17.00 Urethane 783 (unsaturated urethane oligomers) 20.00 Chemlink 600 (polyoxyethylene glycol dimethacrylate) 10.00 Hydroxypropyl methacrylate 10.00 Styrene 15.00 2% Benzoquinone 1.70 t-Butyl peroxybenzoate 1.00 Zinc stearate 2.00 12% cobalt octoate
0.10 Vulcan XC-72 (conductive carbon black) 2.80 Talc 20.20 TABLE 2.
The evident effect of metal catalysts (e.g., dibutyltin dilaurate or potassium octoate
) on deblocking temperatures can be explained by their ability to generate very nucleophilic metal alkoxylates in the presence of polyols and polar solvents (such as DEG, in the case of potassium octoate
 compared the use of crude GCL and 99% GCL as the glycolysis agent, using stannous octoate
as the catalyst.
[Sn[(Oct).sub.2]], (95%, Sigma, USA), was used without further purification.
Initially, modified nHA was dispersed in castor oil using a high shear homogenizer under an inert nitrogen atmosphere with stannous octoate
(SO) as catalyst at 80[degrees]C for 4 hrs.
The main materials were as follows: polyester polyols (330N/3630, Yiju-Polymer Materials Co., Ltd.), isocyanate (MDI, Yiju-Polymer Materials Co., Ltd.), triethanolamine (AR/Beijing Chemical Factory), silicone oil (8681, Yiju-Polymer Materials Co., Ltd.), stannous octoate
(Yiju-Polymer Materials Co., Ltd.), and water-soluble ammonium polyphosphate form I (the molecular weight of SAPP is 1649 g/mol, Zhenjiang Star Flame retardant Co., Ltd.).
And, because they incorporate rare earth metals, they are pricier than current industry standard, stannous octoate
. Nevertheless, they show great potential to improve the rate and selectivity of PLA formation, which could enhance material properties, increase the efficiency of manufacturing processes and help lower the price of these bioplastics.
1% wt stannous octoate
and p-toluene sulfonic acid was used with a maximum temperature of about 160[degrees]C and under reduced pressure of 8 mmHg for about 2 h for the polymerization process.
Versfelt, "Use of stannous octoate
catalyst in the manufacture of l(-)lactide-glycolide copolymer sutures," US Patent 3839297, 1974.
Poly(ethylene glycol), (PEG: 1 kDa and 4 kDa), methoxy-PEG (550 Da), stannous octoate
, [epsilon]-caprolactone,, poly(vinyl alcohol) (PVA), and lipopolysaccharide were procured from Sigma-Aldrich (St.
PCL is regularly achieved through ring opening process (ROP) of ecaprolactone in the presence of metal alkoxides (aluminium isopropoxide, tin octoate
Ring-opening polymerization of the poly(D-lactide)was performed in bulk at 180[degrees]C for one hour using stannous octoate
and 1-octanol as polymerization catalyst and initiator, respectively.