Cyclolinear poly

Table 14. Some parameters of cyclolinear poly(alkylcarbosiloxanes) with regard to synthesis conditions...

Table 11. Temperatures and heat transitions of cyclolinear poly (methylphenylsiloxanes) with flexible spacers [75]...

ACRONYMS. ALTERNATIVE NAMES. TRADE NAMES Phenyl-T, PPSQ, PPS, PLOS, CLPHS, phenyl siUcobenzoic anlwdryde, cyclolinear poly(phenylsiloxane), phenyl siliconic lnhydride, Ladder Coat (Mitsubishi Electric), Glass Resin (Owens Illinois/ Showa Denko)... 

In the 1980 s, a novel cdass of mesomorphic polysiloxanes has been added to the family of element-organic mesomorphic macromolecules viz. the cyclolinear poly-organosiloxanes. Depending on the nature of substituents and the type of linking of cycles in macromolecules, the flexibility of such cyclolinear macromolecules can change considerably from being very flexible, similar to typical linear polyorgano-... 

Organized Langmuir films and poly layers of mesomorph cyclolinear polysilox-anes 98MI35. 

The cyclolinear polycarbosilane, (poly(l-hexyl-l,3-ditolyl-l,3-disilacyclobutane), prepared by ADMET polymerization as reported previously (see Scheme 13) was modified by grafting poly(methyl methacrylate) (PMMA) or polystyrene <2006MM8684>. Polydiphenylsilylenemethylene thin films have been synthesized by using laser-ablated metal nanoparticles for the thermal ring-opening polymerization of l,l,3,3-tetraphenyl-l,3-disilacyclobutane <2007MI3093>. 

Table 1. Physical and chemical parameters of poly(organocarbosiloxane) copolymers of cyclolinear structure...

Figure 8. 7g dependence of cyclolinear carbosiloxane copolymers (VI) on length of linear poly(dimethylsiloxane), n. 

In synthesized cyclolinear siloxane polymers (CLSP) the dimethylsiloxane unit was taken as a flexible spacer [74], Table 10 shows temperatures and heat transitions in relation to the flexible spacers lengths. These polymers were found in the crystalline and thermotropic states, like trans-tactic poly-(decaorganocyclohexasiloxanes), but temperature range of the... 

Structures of volatile degradation products show that all these molecules were detached from the cyclolinear polymer by the mechanism first suggested for poly(dimethylsiloxane) by Thomas [4], In this mechanism, degradation starts with formation of an intermediate fourcentered structure, and then two siloxane bonds involved are rearranged. 

New cyclolinear phosphazene poly(ether ketones) (224a, b) have been synthesized by the condensation of the new spiro-substituted cyclophosphazene (223) with 4,4 -difluorobenzophenone and a bisphenol. ... 

Hydrosilylation of unsaturated organosilicon compounds has also found several applications in molecular and polymer organosilicon chemistry. In particular, the addition of polyfunctional silicon hydrides to poly(vinyl)organosiloxane, catalyzed exclusively by Pt compounds and providing an activated cure for silicon rubber [10], has been of great practical importance. Hydrosilylation of the vinyl group at silicon seems to be effective synthetic method for preparation of oligomers and polymers with a linear or cyclolinear stmcture (polyhydrosilylation), and can occur either via the addition of dihydro-carbosilanes and -siloxanes to divinyl-silanes and -siloxanes [25, 26] or by intermolecular hydrosilylation [4] (eq. (1)). 

This section is concerned with polymers derived from open-chain phosphazenes, phospha(thia)zenes and related cross-linked materials. Cyclolinear and cyclomatrix materials as well as carbon-chain polymers with cyclophasphazene substituents are covered in Section 3. General and specific reviews have appeared including an overview of recent development in inorganic polymers including poly(phosphazenes), a comprehensive survey of hybrid siloxane-phosphazene systems, water-soluble phosphazenes and related hydrogels, a brief survey of polymerization reactions and mechanisms, and sulfur containing poly(phosphazenes). ... 

Thus, the subject of the review are linear and cyclolinear etement-organic polymers forming a spedfic type of the mesophase state. The structure of the mesoj iases and the formation of liquid crystalline macromolecules, in wiiidi classical mesogens in the main or side chains are linked by flexible polysiloxane or poly-phosphazene spacers are similar to the liquid-crystalline polymers with organic spacers. Structure and properties of these polymers have been reviewed recently and, therefore, will not be considered in our article. 

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