Thermoreversible gelation of syndiotactic polystyrene in benzene

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

“…The monomeric unit to a guest molecule ratio is 4:1 for clathrates where the low molecular weight guest molecules are accommodated into the isolated cavity within the crystal lattice of sPS [1,3,[20][21][22][23][24][25]. The monoclinic δ intercalates have the monomeric unit to guest ratio 2:1, where the guest molecules are not trapped inside the cavity, but are placed in between the polymer helices [1,3,[30][31][32]34]. It is also worth mentioning here that guests like benzene forms both clathrates and intercalate structures in gel form of sPS/benzene complex depending upon the concentration [34,35].…”

“…The monoclinic δ intercalates have the monomeric unit to guest ratio 2:1, where the guest molecules are not trapped inside the cavity, but are placed in between the polymer helices [1,3,[30][31][32]34]. It is also worth mentioning here that guests like benzene forms both clathrates and intercalate structures in gel form of sPS/benzene complex depending upon the concentration [34,35]. δ clathrates are M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 further classified into δ monoclinic and δ triclinic, based on the shape and size of the guest molecules, which can significantly affect the distance between the polymer helices (d 010 ) [36,37].…”

Flow Temperature of Poly(Lactic Acid) Gel in Solvents with Different Solubility

“…11) The PLLA sample was purchased from Polymersciences which reports the molecular weight to be 7×10 5 . The PLLA was dissolved in DMF at 110 °C, and the solution was poured into a breakable container.…”

“…Marubayashi et al 3,4) reported that PLLA forms complex crystals with some solvents including N,N-dimethylformamide (DMF), and designated these crystals as "ε-crystal". Guenet, Daniel and their coworkers [5][6][7][8] reported that syndiotactic polystyrene also form complex crystals with some solvents such as 1,2-dichloroethan and 1-chloropropane, and gels in these solvents.…”

Microfibrillar Networks: Polymer Thermoreversible Gels vs Organogels

“…This compound consists of solvated chains, where the solvent is housed within the cavities created by the protruding phenyl groups [10] . As has been observed from neutron scattering experiments on iPS/ cis-decalin gels [11] (see Figure 5) but also on sPS/benzene and sPS/toluene gels [12,13] , the originally flexible chains become more rigid. In the case of iPS/cis-decalin gels it has been shown that their persistence length increases from l p ¼ 1 nm to l p ¼ 4 nm.…”