Branched Polymers I Episode 2 pps

... the anionic ring opening polymerization of the third monomer (EO or e-CL) was initiated. Only limited characterization data were given in this communication. 2. 2.1.8 Synthesis of ABCD Miktoarm ... structure. Asymmetric Star Polymers: Synthesis and Properties Nikos Hadjichristidis, Stergios Pispas, Marinos Pitsikalis, Hermis Iatrou and Costas Vlahos Department of Chemistry, University of At...

Ngày tải lên: 13/08/2014, 08:21

... viscosity. Functional star -branched PIBs were prepared in high yield by Wang et al. [ 12] , based on living cationic polymerization via haloboration initiation. First, living PIBs carrying X 2 B- ... (5) Living cationic polymerization of both styrenic monomers was carried out with the use of the HI/ZnI 2 initiating system in CH 2 Cl 2 at –15 °C in the presence of tetra-n-butylammon...

Ngày tải lên: 13/08/2014, 08:21

... termination by recombination or 2. 0 either for the termination by disproportionation or for the chain transfer to small mol- ecules. In this respect, any living polymerization with rapid initiation ... end-capping of a living polymer (termination method), (b) initiation of living polymeriza- tion (initiation method), (c) transformation of any functional end-group, and (d) polyaddition. Meth...

Ngày tải lên: 13/08/2014, 08:21

... expansion in a good solvent is limited. In this re- gard it is important to note that the q condition must be carefully specified. It is known that branched polymers have different q conditions ... in this synthesis is finding conditions for the poly(propylene imine) synthesis under which the low MW polystyrene (MW= 320 0) is soluble [38]. Similar poly(imine) dendrimers with carboxylic acid...

Ngày tải lên: 13/08/2014, 08:21

... ex- hibited a thermotropic nematic liquid crystalline (LC) behavior based on conformational isomerism (Fig. 8). Kim described hyperbranched aromatic polyamides [89, 95] which exhibited a lyotropic ... a-value in the Mark-Houwink-Sakurada equation and low intrinsic viscosities. This is consist- Hyperbranched Polymers 15 3 .2. 2 Aliphatic Polyesters The use of aliphatic monomers for hyperbran...

Ngày tải lên: 13/08/2014, 08:21

... heterogeneity in the distribution of polymer units is more important for high functionalities, e.g., the heterogeneity occurring in stars with many branches allows one to distinguish a central region ... representative sample of them) after this equilibration period. 3.1.1 Lattice Algorithms A basic polymer model is built by attaching successive units along the chain in neighboring sites of a...

Ngày tải lên: 13/08/2014, 08:21

... the fun with us on that day. Your sister, Helen - Listen to the teacher's minutes, part III: 10 minutes, part IV: 15 minutes. - Ask Ss to do listening in class. 2. 1. Listening: - ... part II: 10 1. If I had been working at the restaurant last night, I would have waited on your table. 2. If they had been paying attention, they would have seen the sign marking 3. If C...

Ngày tải lên: 27/07/2014, 19:21