ICCAS OpenIR
What controls the lamellar orientation at the surface of polymer films during crystallization?
Wang, Yong1; Chan, Chi-Ming1; Ng, Kai-Mo1,2; Li, Lin3
2008-04-08
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:7Pages:2548-2553
AbstractThe crystalline morphologies of poly(bisphenol A hexane ether) (BA-C6) films were investigated using atomic force microscopy (AFM). The glass transition temperatures (T(g)s) of the BA-C6 films on silicon wafers were determined using an ellipsometer, and the results indicated that the T, increased dramatically when the thickness of the films was smaller than about 30 nm. The lamellar orientation of the BA-C6 films with thicknesses of about 33 and 970 nm was studied at temperatures varying between the T, and the melting point of the polymer (T-m). In the 33 run films, we found that the edge-on lamellae predominantly formed at the temperatures close to the bulk T-g (T-g similar to 35 degrees C), while some edge-on and mostly flat-on lamellae developed at the temperatures near T-m (T-m similar to 98 degrees C). In addition to temperature, the film thickness was found to have significant influence on the observed lamellar orientation at the surface. The concentration of the edge-on lamellae increased as the film thickness increased. These observations were explained on the basis that polymer chain mobility is strongly affected by the thickness of the films, temperature, and the interactions between the polymer and substrate. A three-layer T-g model was proposed for supported polymer films.
DOI10.1021/ma7021309
Indexed BySCI
Language英语
WOS IDWOS:000254645200038
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:94[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/65158
Collection中国科学院化学研究所
Corresponding AuthorChan, Chi-Ming
Affiliation1.Hong Kong Univ Sci & Technol, Dept Chem Engn, Hong Kong, Hong Kong, Peoples R China
2.Hong Kong Univ Sci & Technol, Adv Engn Mat Facil, Hong Kong, Hong Kong, Peoples R China
3.Acad Sinica, Inst Chem, State Key Lab Polymer Phys & Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yong,Chan, Chi-Ming,Ng, Kai-Mo,et al. What controls the lamellar orientation at the surface of polymer films during crystallization?[J]. MACROMOLECULES,2008,41(7):2548-2553.
APA Wang, Yong,Chan, Chi-Ming,Ng, Kai-Mo,&Li, Lin.(2008).What controls the lamellar orientation at the surface of polymer films during crystallization?.MACROMOLECULES,41(7),2548-2553.
MLA Wang, Yong,et al."What controls the lamellar orientation at the surface of polymer films during crystallization?".MACROMOLECULES 41.7(2008):2548-2553.
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