Bai, Lu; Luo, Pan; Yang, Xudong; Xu, Jianquan; Kawaguchi, Daisuke; Zhang, Cuiyun; Yamada, Norifumi L.; Tanaka, Keiji; Zhang, Wei; Wang, Xinping published the artcile< Enhanced Glass Transition Temperature of Thin Polystyrene Films Having an Underneath Cross-Linked Layer>, COA of Formula: C9H9Cl, the main research area is ultrathin polystyrene film glass transition temperature chain mobility conformation.
Due to the importance of the interface in the segmental dynamics of supported macromol. ultrathin films, the glass transition temperature (Tg) of polystyrene (PS) ultrathin films upon solid substrates modified with a crosslinked PS (CLPS) layer has been investigated. The results showed that the Tg of the thin PS films on a silica surface with a ∼ 5 nm crosslinked layer increased with reducing film thickness. Meanwhile, the increase in Tg of the thin PS films became more pronounced with increasing crosslinking d. of the layer. For example, a 20 nm thick PS film supported on CLPS with 1.8 kDa of crosslinking degree exhibited an ∼35 K and ∼50 K increase in Tg compared to its bulk and that on neat SiO2 substrate, resp. Such a large Tg elevation for the ultrathin PS films was attributed to the interfacial aggregation states in which chains diffused through nanolevel voids formed in the crosslinked layer to the SiO2-Si surface. In such a situation, the chains were topol. constrained in the crosslinked layer with less mobility. These results offer us the opportunity to tailor interfacial effects by changing the degree of crosslinking, which has great potential application in many polymer nanocomposites.
ACS Macro Letters published new progress about Annealing. 1592-20-7 belongs to class chlorides-buliding-blocks, and the molecular formula is C9H9Cl, COA of Formula: C9H9Cl.
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics