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Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes

Shaiju, P.; Bhoje Gowd, E.

By 12 March 2019No Comments

Polymer, 2015, vol 56pp. 581-589



The role of host preparation method on the structural phase transition of syndiotactic polystyrene (sPS) after the guest exchange process has been thoroughly investigated in our previous study using a series of n-alkanes [Polymer 2013; 54:6617-27]. In addition to the host preparation method, we have found that guest molecules used for the guest exchange process also have a significant role in facilitating the phase transitions of the host structure. Chloroform and toluene treated γ form samples were used as starting materials for the guest exchange process with different kind of solvents. Solvents that are capable of crystallizing sPS into the delta (δ) co-crystal are termed as clathrate guests and the solvents which are crystallizing sPS directly into the γ form are termed as γ form inducing solvents. Upon guest exchange process (performed by dipping the samples in clathrate guests and γ form inducing solvents), chloroform treated of γ form (ε clathrate) sample transformed into the mixture of ε clathrate and δ clathrate in the presence of clathrate guests, whereas the ε co-crystal is retained its structure in the presence of γ form inducing solvents. However, the toluene treated γ form (monoclinic δ) samples show different structures upon guest exchange process depending on the kind of guest molecules. In the case of clathrate guests, upon the guest exchange, the monoclinic δ retained its structure; however, the toluene treated γ form (monoclinic δ) transformed to the γ form in the presence of γ form inducing solvents. Apart from the guest exchange process, structural changes upon the guest extraction process were also investigated.

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