Preparation of porous materials by amphiphilic block copolymer polystyrene-block-poly (vinyl pyrrolidone) self-assembly was written by Li, Ying;Han, Han;Yuan, Jinfang. And the article was included in Gongneng Cailiao in 2016.HPLC of Formula: 27249-90-7 This article mentions the following:
A series of diblock copolymers, polystyrene-block-poly (vinyl pyrrolidone) (PSt-b-PVP), with different hydrophilic/hydrophobic ratios was prepared by reversible addition fragmentation chain transfer (RAFT) polymerization The structures and properties of the diblock copolymers were characterized by FT IR, 1H NMR and GPC. Different additives and a series of PSt-b-PVP with different hydrophilic/hydrophobic ratios dissolved in selective solvents. After solvent evaporation, the transparent film was obtained by rising with water. FESEM was used to study the morphol. and size of the polymer porous material. The influence of additives, solvent evaporation temperature, the solvents and the hydrophilic/hydrophobic ratios on pore size were also studied. The results show that if the structure that we uses contains -OH functional groups or the monomer itself is used as additive, the porous polymer formed would have smaller holes. Meanwhile, reducing the heat is benefit to reduce the size of porous. And if we can use the structure which hydrophilic/hydrophobic ratios is PSt101-b-PVP79, it would be more easier to form smaller porous. Besides, using volatile solvent can be good for the forming of porous. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7HPLC of Formula: 27249-90-7).
Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.HPLC of Formula: 27249-90-7
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics