ICCAS OpenIR
Free volume changes, crystallization, and crystal transition behavior of syndiotactic polystyrene in supercritical CO2 revealed by positron annihilation lifetime spectroscopy
Ma, Weiming1; Andersson, Anna3; He, Jiasong1; Maurer, Frans H. J.3
2008-07-22
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:14Pages:5307-5312
AbstractThe free volume of syndiotactic polystyrene (sPS) conditioned in supercritical CO2 was investigated by using positron annihilation lifetime spectroscopy (PALS). Supercritical CO2 increased the free volume cavity size of amorphous sPS and made the formation of gamma crystal occur. The orthopositronium (o-Ps) intensity I-3 was correlated well with the crystallinity of gamma form sPS, revealed by its gradual decrease with the increase of crystallinity. Furthermore, the treatment atmosphere affected the crystallization behavior of amorphous sPS. The increased free volume cavity size of amorphous sPS treated in supercritical CO2 was larger than those treated in ambient air and supercritical N-2. Among these treatment conditions, supercritical CO2 increased the free volume size of amorphous sPS more effectively and thus resulted in the formation of gamma crystals. PALS measurements indicated that supercritical CO2 helped remaining a constant high free volume level of the amorphous parts of the semicrystalline sPS. Likely, the crystalline parts were also affected by the scCO(2) as a transition from the gamma form to the beta form was revealed at high temperatures by WAXD.
DOI10.1021/ma8009068
Indexed BySCI
Language英语
WOS IDWOS:000257665900032
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64316
Collection中国科学院化学研究所
Corresponding AuthorHe, Jiasong
Affiliation1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Engn Plast,Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
3.Lund Univ, Lund Inst Technol, Dept Polymer & Mat Chem, SE-22100 Lund, Sweden
Recommended Citation
GB/T 7714
Ma, Weiming,Andersson, Anna,He, Jiasong,et al. Free volume changes, crystallization, and crystal transition behavior of syndiotactic polystyrene in supercritical CO2 revealed by positron annihilation lifetime spectroscopy[J]. MACROMOLECULES,2008,41(14):5307-5312.
APA Ma, Weiming,Andersson, Anna,He, Jiasong,&Maurer, Frans H. J..(2008).Free volume changes, crystallization, and crystal transition behavior of syndiotactic polystyrene in supercritical CO2 revealed by positron annihilation lifetime spectroscopy.MACROMOLECULES,41(14),5307-5312.
MLA Ma, Weiming,et al."Free volume changes, crystallization, and crystal transition behavior of syndiotactic polystyrene in supercritical CO2 revealed by positron annihilation lifetime spectroscopy".MACROMOLECULES 41.14(2008):5307-5312.
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