The preparation of polydimethylsiloxanes (PDMS) of narrow molecular weight distribution (MWD) by anionic polymerization of hexamethyicyclotrisiloxane (D3) in an improved polymerization apparatus is described. Using (CH3)2Si(OLih as initiator and (CH3hSiCI (TMCS) as terminating agent, polymers with o
Synthesis and characterization of high molecular weight poly(1,5-dioxepan-2-one) with narrow molecular weight distribution
✍ Scribed by Anders Löfgren; Ann-Christine Albertsson
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 783 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0032-3861
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Polybutadienes (PBs) of narrow molecular weight distributions with high 1,4-microstructure were synthesized by sec-butyllithium-initiated, living polymerization. The shoulder-like anomalous behavior of the storage modulus GЈ() in the terminal zone for PBs was studied using size exclusion chromatogra
The cationic polymerization of cis-1,2-dimethoxyethylene has been investigated and conditions for the formation of polymers of exceptionally high molecular weight of about lo6 have been established. I t was shown by means of GPC method, that long chain branching was absent, MWD was unimodal and J@,/