If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Exploring Time-Dependent Structural Changes During the Cold Crystallization Process of Isotactic Polystyrene by Infrared Spectroscopy and Multivariate Curve Resolution

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

The present study attempts an application of Fourier transform infrared (FT-IR) spectroscopy in conjunction with multivariate curve resolution (MCR) techniques to explore the structural evolution of isotactic polystyrene (iPS) during the cold crystallization process. The focus of the present study is placed on the performance of MCR techniques, e.g., orthogonal projection (OP), alternating least squares (ALS), and fixed-size moving window evolving factor analysis (FSMWEFA), and the interpretability of spectral changes in the investigated chemical process. As a result, valuable information and conclusions about the structural evolution of iPS during the crystallization process can be extracted: when the amorphous phase of iPS changes, the ordering of the phenyl rings takes place first, and then the polymer chains adjust their local conformations to form short 31 helix structures. Furthermore, according to intensity profiles of the spectral variations, the ordering of the phenyl rings proceeds more intensely than the formation of ordered local chains, and the structural evolution of iPS occurs even during the induction period. The spectral variations resulting from the conformational changes in the 31 helical structures depend on the sequence length of the helical chains: the longer the polymer chain is, the smaller the corresponding band variations are. It has been demonstrated that the combination of FTIR spectroscopy and chemometric MCR techniques is very promising for the analysis of the crystallization process of polymers. MCR is a powerful tool for analyzing and visualizing spectral data and integrating them with other information, making spectral intensity variations more amenable to interpretation in order to explore the molecular dynamics of polymers.

Keywords: 2D-COS; FOURIER TRANSFORM INFRARED SPECTROSCOPY; FT-IR SPECTROSCOPY; IPS; ISOTACTIC POLYSTYRENE; MCR; MULTIVARIATE CURVE RESOLUTION; TWO-DIMENSIONAL CORRELATION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206776023359

Affiliations: 1: Department of Chemistry and Research Center for Environment Friendly Polymers, School of Science and Technology, Kwansei-Gakuin University, Sanda 669-1337, Japan; College of Chemistry and Chemical Engineering, Institute of Chemometrics and Intelligent Analytical Instruments, Central South University, Changsha 410083, P. R. China 2: Department of Chemistry and Research Center for Environment Friendly Polymers, School of Science and Technology, Kwansei-Gakuin University, Sanda 669-1337, Japan 3: College of Chemistry and Chemical Engineering, Institute of Chemometrics and Intelligent Analytical Instruments, Central South University, Changsha 410083, P. R. China

Publication date: February 1, 2006

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more