نتایج جستجو برای: isotactic poly 1
تعداد نتایج: 2815100 فیلتر نتایج به سال:
In the present work we aim to clarify the role of the microstructure and the crystalline distribution from the thermo-oxidation of solid isotactic PP (iPP) and ethylene-propylene (EP) copolymers. The effects of the content and quality of the isotacticity interruptions, together with the associated average isotactic length, on the induction time (ti) as well as on the activation energy (Eact) of...
برهمکنش پورفیرازین کاتیونی تتراکیس(n,n,n,n 3و4-تتراپیریدینو) کبالت(ii) (co(tmtppa))با پلی-نوکلئوتیدهای سنتزی: poly(g-c) و poly(a-t) و dna غده تیموس گوساله در بافر فسفات 5/7 میلی مولار با ph 2/7 با استفاده از تکنیک های اسپکتروسکوپی جذب نوری و فلورسانس مطالعه شده است. کاهش جذب و جابجایی قرمز در طول .موج طیف uv-vis پورفیرازین به دلیل برهمکنش با هر دو پلی نوکلئوتیدهای poly(g-c) و poly(a-t) مشاهده...
In this work, poly(lactic acid) (PLA) dimer model compounds with different tacticities were synthesized and studied in detail by 1H and 13C nuclear magnetic resonance (NMR) in three solvents, deuterated chloroform (CDCl3)/CCl4 (20/80 v/v), CDCl3 and dimethyl sulfoxide -d6. All of the peaks in the 1H and 13C NMR spectra were assigned with the help of two-dimensional NMR. Although the solvents we...
The synthesis of chiral aluminum and yttrium alkoxides and their application for lactide polymerization are reported. The complexes (SalBinap)MOR [4, M = Al, R = (i)Pr; 5, M = Y, R = (CH(2))(2)NMe(2)] are synthesized by reacting the ligand (SalBinap)H(2) [2,2'-[(1,1'-binaphthalene)-2,2'-diylbis(nitrilomethylidyne)]bisphenol] with the appropriate metal trisalkoxide. While enantiomerically pure y...
Preparation of non-conjugated luminescent polymers (NCLPs) with excellent cluster luminescence (CL) performance is great significance for scientific and industrious applications, yet improving the NCLPs through proper structural design still a huge challenge. Herein, we report ionized polymeric system consisting (?)-camphorsulfonic acid ((?)-CSA) poly(2-vinylpyridine) (P2VP). These acid-base co...
Microstructure evolution of isotactic polypropylene during annealing: Effect of poly(ethylene oxide)
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