Shape memory and nanostructure in poly(norbornyl-POSS) copolymers

H. G. Jeon; P. T. Mather; T. S. Haddad

doi:10.1002/(SICI)1097-0126(200005)49:5<453::AID-PI332>3.0.CO;2-H

Shape memory and nanostructure in poly(norbornyl-POSS) copolymers

H. G. Jeon, P. T. Mather, T. S. Haddad

Department of Biomedical & Chemical Engineering

Research output: Contribution to journal › Article › peer-review

202 Scopus citations

Abstract

The microstructure and shape-memory properties of norbornyl-POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane macromer. Samples containing 50wt% of POSS macromer have been mechanically drawn at temperatures above their glass transition temperatures, followed by rapid quenching in LN₂. Shape-memory properties of such drawn samples were explored by measuring recovered strain while heating above the T_g using thermomechanical analysis. Incorporation of POSS comonomers within PN is found to slightly reduce the percentage recovery, while improving thermal stability significantly. Interestingly, the types of corner groups in the POSS macromer affect the shape-memory behaviour, with the CyPOSS copolymer showing lower percentage recovery than the CpPOSS copolymer due to enhanced aggregation of CyPOSS macromers.

Original language	English (US)
Pages (from-to)	453-457
Number of pages	5
Journal	Polymer International
Volume	49
Issue number	5
DOIs	https://doi.org/10.1002/(SICI)1097-0126(200005)49:5<453::AID-PI332>3.0.CO;2-H
State	Published - 2000

Keywords

Nanocomposite
POSS
Polynorbornene
Shape-memory polymer

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1002/(SICI)1097-0126(200005)49:5<453::AID-PI332>3.0.CO;2-H

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title = "Shape memory and nanostructure in poly(norbornyl-POSS) copolymers",

abstract = "The microstructure and shape-memory properties of norbornyl-POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane macromer. Samples containing 50wt% of POSS macromer have been mechanically drawn at temperatures above their glass transition temperatures, followed by rapid quenching in LN2. Shape-memory properties of such drawn samples were explored by measuring recovered strain while heating above the Tg using thermomechanical analysis. Incorporation of POSS comonomers within PN is found to slightly reduce the percentage recovery, while improving thermal stability significantly. Interestingly, the types of corner groups in the POSS macromer affect the shape-memory behaviour, with the CyPOSS copolymer showing lower percentage recovery than the CpPOSS copolymer due to enhanced aggregation of CyPOSS macromers.",

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T1 - Shape memory and nanostructure in poly(norbornyl-POSS) copolymers

AU - Jeon, H. G.

AU - Mather, P. T.

AU - Haddad, T. S.

PY - 2000

Y1 - 2000

N2 - The microstructure and shape-memory properties of norbornyl-POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane macromer. Samples containing 50wt% of POSS macromer have been mechanically drawn at temperatures above their glass transition temperatures, followed by rapid quenching in LN2. Shape-memory properties of such drawn samples were explored by measuring recovered strain while heating above the Tg using thermomechanical analysis. Incorporation of POSS comonomers within PN is found to slightly reduce the percentage recovery, while improving thermal stability significantly. Interestingly, the types of corner groups in the POSS macromer affect the shape-memory behaviour, with the CyPOSS copolymer showing lower percentage recovery than the CpPOSS copolymer due to enhanced aggregation of CyPOSS macromers.

AB - The microstructure and shape-memory properties of norbornyl-POSS hybrid copolymers having either cyclohexyl corner groups (CyPOSS) or cyclopentyl corner groups (CpPOSS) were investigated by transmission electron microscopy and thermomechanical analysis. Here, POSS refers to the polyhedral oligomeric silsesquioxane macromer. Samples containing 50wt% of POSS macromer have been mechanically drawn at temperatures above their glass transition temperatures, followed by rapid quenching in LN2. Shape-memory properties of such drawn samples were explored by measuring recovered strain while heating above the Tg using thermomechanical analysis. Incorporation of POSS comonomers within PN is found to slightly reduce the percentage recovery, while improving thermal stability significantly. Interestingly, the types of corner groups in the POSS macromer affect the shape-memory behaviour, with the CyPOSS copolymer showing lower percentage recovery than the CpPOSS copolymer due to enhanced aggregation of CyPOSS macromers.

KW - Nanocomposite

KW - POSS

KW - Polynorbornene

KW - Shape-memory polymer

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EP - 457

JO - Polymer International

JF - Polymer International

IS - 5

ER -

Shape memory and nanostructure in poly(norbornyl-POSS) copolymers

Abstract

Keywords

ASJC Scopus subject areas

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