Conformation of cyclic and linear polydimethylsiloxane in the melt: A small-angle neutron-scattering study

Simona Gagliardi; Valeria Arrighi; A. Dagger; A. J. Semlyen

doi:10.1007/s003390101110

Conformation of cyclic and linear polydimethylsiloxane in the melt: A small-angle neutron-scattering study

Simona Gagliardi
, Valeria Arrighi
, A. Dagger
, A. J. Semlyen

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

16 Citations (Scopus)

Abstract

In this study we report small-angle neutron-scattering measurements of cyclic and linear polydimethyl-siloxane (PDMS) in the melt. It has been suggested that due to the presence of topological constraints, rings in the melt may be more compact than Gaussian chains. We show that the cyclic chains are partially collapsed and do not follow Gaussian statistics: the weight-average radius of gyration R_g,w is found to be proportional to M_w^0.53 and M_w^0.40 in the case of linear and cyclic PDMS, respectively. The results are in agreement with recent computer simulations, which predict R_g to be proportional to N^2/5, where N is the degree of polymerisation.

Original language	English
Pages (from-to)	S469-S471
Number of pages	3
Journal	Applied Physics A: Materials Science and Processing
Volume	74
Issue number	Supplement 1
DOIs	https://doi.org/10.1007/s003390101110
Publication status	Published - Dec 2002

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10.1007/s003390101110

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abstract = "In this study we report small-angle neutron-scattering measurements of cyclic and linear polydimethyl-siloxane (PDMS) in the melt. It has been suggested that due to the presence of topological constraints, rings in the melt may be more compact than Gaussian chains. We show that the cyclic chains are partially collapsed and do not follow Gaussian statistics: the weight-average radius of gyration Rg,w is found to be proportional to Mw0.53 and Mw0.40 in the case of linear and cyclic PDMS, respectively. The results are in agreement with recent computer simulations, which predict Rg to be proportional to N2/5, where N is the degree of polymerisation.",

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T2 - A small-angle neutron-scattering study

AU - Gagliardi, Simona

AU - Arrighi, Valeria

AU - Dagger, A.

AU - Semlyen, A. J.

PY - 2002/12

Y1 - 2002/12

N2 - In this study we report small-angle neutron-scattering measurements of cyclic and linear polydimethyl-siloxane (PDMS) in the melt. It has been suggested that due to the presence of topological constraints, rings in the melt may be more compact than Gaussian chains. We show that the cyclic chains are partially collapsed and do not follow Gaussian statistics: the weight-average radius of gyration Rg,w is found to be proportional to Mw0.53 and Mw0.40 in the case of linear and cyclic PDMS, respectively. The results are in agreement with recent computer simulations, which predict Rg to be proportional to N2/5, where N is the degree of polymerisation.

AB - In this study we report small-angle neutron-scattering measurements of cyclic and linear polydimethyl-siloxane (PDMS) in the melt. It has been suggested that due to the presence of topological constraints, rings in the melt may be more compact than Gaussian chains. We show that the cyclic chains are partially collapsed and do not follow Gaussian statistics: the weight-average radius of gyration Rg,w is found to be proportional to Mw0.53 and Mw0.40 in the case of linear and cyclic PDMS, respectively. The results are in agreement with recent computer simulations, which predict Rg to be proportional to N2/5, where N is the degree of polymerisation.

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DO - 10.1007/s003390101110

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SP - S469-S471

JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

IS - Supplement 1

ER -

Conformation of cyclic and linear polydimethylsiloxane in the melt: A small-angle neutron-scattering study

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