Oligo thermal stability

The thermal stability of the oligo(phenyleneoxide) was much higher than that of oligo(2,6-dimethylphenyleneoxide) with the same molecular weight. The poly(l,4-phenyleneoxide) structure is expected to show interesting properties. 

Based on the values of cohesive energies and dissociation energies of the bonds involved in the polyurethane structure, it may be possible to establish the following relative order regarding the thermal stability of polyurethanes function of the oligo-polyol structure ... 

Although HMFA is more stable than DHMF, its still limited thermal stability is reflected in the fact that only two scientific papers and one patent application can be found describing HMFA-based polyesters. Whereas Hirai et al were only able to obtain macrocyclic oligo-esters by solution polymerization in pyridine [58,59], Moore and Kelly used trans-esterification of the methyl ester of HMFA, also giving materials in low yield and with low molecular weights [60]. 

To study the effect of secondary structures in RNA on TLR7- and TLR8-mediated immune responses, we have designed and synthesized phosphorothioate oligo-ribonucleotides (ORNs) with self-complementary sequences that form duplex structures with either 3 - or 5 -overhanging sequences [31]. ORNs-containing self-complementary sequences form secondary structures, and the thermal stability... 

Guo et al. synthesized a series of block-type amphiphilic copolymers via copolymerization of methacrylate end-capped oligo-urethane and MPS via the sol-gel process [167]. After hydrolysis and condensation of the copolymer precursors (self-assembled in the form of spherical micelles), polyurethane-silica hybrid materials with excellent thermal stability and mechanical properties were obtained. Etmimi et al. synthesized PS-GO nanocomposites via surface RAFT-mediated miniemulsion polymerization [155]. The molar mass and dispersity of PS in the nanocomposites were dependent on the amount of RAFT-grafted GO in the system. The PS-GO nanocomposites were of exfoliated morphology, and their thermal stability and mechanical properties were dependent on the modified GO content and better than those of neat PS polymer. Salami-Kalajahi et al. studied the effect of pristine nanoparticle loading on the properties of PMMA-silica nanocomposites prepared... 

X-ray diffraction analysis indicates that oligomers are amorphous systems with the interchain dis-tance equal d 8.64 A. Thermogravimetric studies show that by thermal oxidative stability oligo-mers are behind polyorganocyclotetrasiloxanes only. 

Wachen, O. Reichert, K.H. Kruger, R.P. Much, H. Schulz, G. Thermal decomposition of biodegradable polyesters-III. Studies on the mechanisms of thermal degradation of oligo-l.-lactide using SEC, LACCC and MALDI-TOF-MS. Polym. Degrad. Stabil. 1997, 55 (2), 225-231. 

---