Abstract/Details

Model organic -inorganic hybrid copolymers based on polyhedral oligomeric silsesquioxane


2006 2006

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Abstract (summary)

Hybrid organic-inorganic materials is a new class of materials having important technological potential. In this thesis, Polyhedral Oligomeric Silsesquioxane (POSS) is used as an inorganic building block which is tethered to an organic polymer. The influence of POSS on the thermal properties as well as the morphology of the final hybrid is the main focus of this work. Different polymerization chemistries were utilized to incorporate POSS into an organic polymer.

Cyclooctadiene was copolymerized with CpPOSS norbornene via Ring-Opening Metathesis Polymerization. The poly(butadiene-r-POSS) series showed lamellae formation after film casting for POSS loading higher than 30 wt%. IbuPOSS-NCO was then attached to a series of well-defined alcohol-terminated polystyrene (PSOH). The alcohol-terminated polystyrene were synthesized by the anionic polymerization of styrene, terminating the reaction with the endcapping of the living polymer by ethylene oxide, which enabled precise control over the molecular weight and the polydispersity (PDI<1.1). Increased thermal resistance was observed upon POSS addition to the PSOH series. Block copolymers of polystyrene and poly(HEMA-POSS) were then synthesized. A series of poly(styrene- b-HEMA) were first synthesized by anionic polymerization under high vacuum and POSS-NCO was reacted with the pendant alcohol of the HEMA block. By varying the volume fraction of each block, lamellar and cylindrical morphologies could be obtained. Long range order was observed by Small Angle X-ray Scattering in the samples having a lamellar morphology. Film casting provided orientation of the lamellae parallel to the surface of the beaker.

A manifold for the safe polymerization of ethylene oxide and butadiene was designed. A diblock copolymer of poly(butadiene-b-ethylene oxide) was synthesized to show the versatility of the manifold.

Indexing (details)


Subject
Polymers
Classification
0495: Polymers
Identifier / keyword
Pure sciences; Copolymers; Oligomeric; Organic-inorganic hybrid; Polyhedral; Silsesquioxane
Title
Model organic -inorganic hybrid copolymers based on polyhedral oligomeric silsesquioxane
Author
Cardoen, Gregoire
Number of pages
167
Publication year
2006
Degree date
2006
School code
0118
Source
DAI-B 67/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780542977961
Advisor
Coughlin, E. Bryan
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3242350
ProQuest document ID
305306203
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305306203
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