Base catalyzed proton transfer polymerization of 1-hydroxypentamethylcyclotrisiloxane. Comparison of hyperbranched polymer microstructure and properties to those of highly regular linear analogs

Paulasaari, Jyri K.; Weber, William P.

doi:10.1002/1521-3935(20000901)201:14<1585::aid-macp1585>3.0.co;2-3

Cited by 17 publications

(12 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Degradation property has become an important performance of temporary materials applied in biomedicine, agriculture, or structural components for reduction of the impact of synthetic functional materials upon the environment 45–49. By using a phosphazene superbase catalyzed proton transfer polymerization and acid catalyzed ring opening polymerization, Paulasaari and Weber50 prepared the isomeric hyperbranched polysiloxanes and highly regular linear polysiloxanes, respectively. The thermogravimetric analysis of hyperbranched polysiloxane was similar to the linear one, but the former gave a higher final residue about 10% compared with almost zero of the latter.…”

Section: Influence Of Branching Architecture On Polymer Propertiesmentioning

confidence: 99%

Influence of branching architecture on polymer properties

Zhu

Zhou

Yan

2011

J Polym Sci B Polym Phys

127

View full text Add to dashboard Cite

Hyperbranched polymers (HBPs), invented at the end of 1980s, are one important subclass of the fourth generation macromolecular architectures following the linear, branched, and crosslinking polymers. Due to their unique topological structure and interesting physical/chemical properties, HBPs have attracted wide attention from both academia and industry. HBPs are composed of linear units, dendritic units, and terminal units. The degree of branching (DB), a term to describe the composition of these three structure units and thus the branching architecture of polymers, is one of the most important intrinsic parameters for HBPs. This review has summarized the effect of the DB on the physical and chemical properties of HBPs, including the rheological property, crystallization and melting behaviors, glass transition, thermal and hydrolytic degradations, phase characteristics, lower critical solution temperature phase transition, optoelectronic properties, encapsulation capability, self-assembly behavior, biomedical applications, and so on. Such a structure and property relationship will build a bridge between the syntheses and applications of HBPs, especially in the application areas of functional materials, biomedical materials, and nanotechnology.

show abstract

Section: Influence Of Branching Architecture On Polymer Propertiesmentioning

confidence: 99%

Influence of branching architecture on polymer properties

Zhu

Zhou

Yan

2011

J Polym Sci B Polym Phys

127

View full text Add to dashboard Cite

show abstract

“…The hydrodynamic radii were also susceptible to the polarity of functional groups on the periphery [65,66,67]. Values of M n and M w determined by SEC method with polystyrene standards for hyperbranched polysiloxanes were much lower than MW obtained with application of MALLS detectors [68,69,70].…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Microstructure of New Liquid Poly(methylhydrosiloxanes) Containing Branching Units SiO4/2

2018

View full text Add to dashboard Cite

Six liquid branched poly(methylhydrosiloxanes) of new random structures (PMHS-Q), containing quadruple branching units SiO4/2 (Q), both MeHSiO (DH) and Me2SiO (D) chain building units (or only mers MeHSiO), and terminal groups Me3SiO0.5 (M) were prepared by a hydrolytic polycondensation method of appropriate organic chlorosilanes and tetraethyl ortosilicate (TEOS), in diethyl ether medium at temperature below 0 °C. Volatile low molecular weight siloxanes were removed by a vacuum distillation at 150–155 °C. Yields of PMHS-Q reached from 55–69 wt%. Their dynamic viscosities were measured in the Brookfield HBDV+IIcP cone-plate viscometer and ranged from 10.7–13.1 cP. Molecular weights (MW) of PMHS-Q (Mn = 2440–6310 g/mol, Mw = 5750–10,350 g/mol) and polydispersities of MW (Mw/Mn = 2.0–2.8) were determined by a size exclusion chromatography (SEC). All polymers were characterized by FTIR, 1H- and 29Si-NMR, and an elemental analysis. A microstructure of siloxane chains was proposed on a basis of 29Si-NMR results and compared with literature data.

show abstract

“…To a solution of allyl‐ c PSt ( M n = 2600) (0.88 g, 0.33 mmol) and 1‐hydrido‐1,3,3,5,5‐pentamethylcyclotrisiloxane12 (0.11 g, 0.5 mmol) in 5 mL of benzene was added 10 μL of platinum(0)‐1,3‐divinyl‐1,1,3,3‐tetramethyldisiloxane complex solution (3 wt % in xylenes) and the reaction mixture was stirred at 60 °C for 12 h. Evaporation of the volatile materials, followed by column chromatography on silica gel using first dichloromethane and then ethyl acetate as the eluent, afforded 0.89 g (94%) of D 3 ‐ c PSt as a white powder.…”

Section: Methodsmentioning

confidence: 99%

Preparation of three‐dimensional poly(dimethylsiloxane) (PDMS) with movable cross‐linking

Miki

Inamoto

Inoue

et al. 2009

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

A pentamethylcyclotrisiloxane moiety was introduced into cyclic polystyrene (cPSt) and cyclic PDMS (cPDMS) to obtain noncovalent cross‐linking agents, D3‐cPSt and D3‐cPDMS, respectively. Anionic ring‐opening polymerization of octamethylcyclotetrasiloxane (D4) in nitrobenzene was carried out in the presence of D3‐cPSt to obtain a cloudy white PDMS gel as a precipitation. On the other hand, bulk copolymerization of D3‐cPDMS with D4 proceeded in a homogeneous state to give a colorless transparent PDMS gel in high yield. The formation of mechanically linked PDMS with movable cross‐linking was indicated by control experiment. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5882–5890, 2009

show abstract

Base catalyzed proton transfer polymerization of 1-hydroxypentamethylcyclotrisiloxane. Comparison of hyperbranched polymer microstructure and properties to those of highly regular linear analogs

Cited by 17 publications

References 31 publications

Influence of branching architecture on polymer properties

Influence of branching architecture on polymer properties

Synthesis, Characterization and Microstructure of New Liquid Poly(methylhydrosiloxanes) Containing Branching Units SiO4/2

Preparation of three‐dimensional poly(dimethylsiloxane) (PDMS) with movable cross‐linking

Contact Info

Product

Resources

About