A study of the glass transition of polypropylene surfaces by sum-frequency vibrational spectroscopy and scanning force microscopy

Sum-frequency generation (SFG) vibrational spectroscopy and scanning force microscopy (SFM) were used to probe structural changes of atactic polypropylene (APP) and isotactic polypropylene (IPP) surfaces in the glass transition. The results indicate that below the glass transition, the surface polym...

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Published inChemical physics Vol. 245; no. 1; pp. 277 - 284
Main Authors Gracias, D.H., Zhang, D., Lianos, L., Ibach, W., Shen, Y.R., Somorjai, G.A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.1999
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Summary:Sum-frequency generation (SFG) vibrational spectroscopy and scanning force microscopy (SFM) were used to probe structural changes of atactic polypropylene (APP) and isotactic polypropylene (IPP) surfaces in the glass transition. The results indicate that below the glass transition, the surface polymer chains are better oriented with the CH 2 groups pointing outward and the surface elastic modulus is higher. The SFG and SFM results correlate well in the transition towards the glass phase. No discernible difference between the glass transition temperatures of the bulk and surface was observed.
ISSN:0301-0104
DOI:10.1016/S0301-0104(99)00043-9