The relationship between the reduced viscosity and concentation of sulfonated styrene-isoprene- styrene triblock copolymer（SSIS） and its ionomers in toluene and toluene/methanol solutions were studied. The intrinsic...The relationship between the reduced viscosity and concentation of sulfonated styrene-isoprene- styrene triblock copolymer（SSIS） and its ionomers in toluene and toluene/methanol solutions were studied. The intrinsic viscosity \ was calculated. The results show that SSIS tends to form an intra-molecular chain interaction and form more enclosed molecular chain with a lower reduced viscosity and intrinsic viscosity when the sulfonation degree x（SO3H） decreased. A change of interaction from intra- to inter-molecular chain was observed, and the intrinsic viscosity improved from 0.641 dL/g to 0.656 dL/g by increasing the sulfonation degree from 3.95% to 7.36% due to the chain combination. This also make the size of molecular chain of SSIS larger than SIS . Although be a precipitant for SIS , a few amounts of methanol can change the solubility of SSIS in toluene by destroying the combination of molecular chain. Lanthanum ionomers showed a lower reduced viscosity as compared with sodium and zinc ionomers.展开更多
The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the s...The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the same sulfonation degree exhibited higher reduced viscosity and intrinsic viscosity when the polarity of the solvents was high. The lower the sulfonation degree of SPS La, the higher the reduced viscosity of SPS La, especially in case of estremely dilute dolutions. The order of the reduced viscosity and the polyelectrolyte effect tendency are:SPS Na>SPS Zn> SPS>SPS La .展开更多
文摘The relationship between the reduced viscosity and concentation of sulfonated styrene-isoprene- styrene triblock copolymer（SSIS） and its ionomers in toluene and toluene/methanol solutions were studied. The intrinsic viscosity \ was calculated. The results show that SSIS tends to form an intra-molecular chain interaction and form more enclosed molecular chain with a lower reduced viscosity and intrinsic viscosity when the sulfonation degree x（SO3H） decreased. A change of interaction from intra- to inter-molecular chain was observed, and the intrinsic viscosity improved from 0.641 dL/g to 0.656 dL/g by increasing the sulfonation degree from 3.95% to 7.36% due to the chain combination. This also make the size of molecular chain of SSIS larger than SIS . Although be a precipitant for SIS , a few amounts of methanol can change the solubility of SSIS in toluene by destroying the combination of molecular chain. Lanthanum ionomers showed a lower reduced viscosity as compared with sodium and zinc ionomers.
文摘The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the same sulfonation degree exhibited higher reduced viscosity and intrinsic viscosity when the polarity of the solvents was high. The lower the sulfonation degree of SPS La, the higher the reduced viscosity of SPS La, especially in case of estremely dilute dolutions. The order of the reduced viscosity and the polyelectrolyte effect tendency are:SPS Na>SPS Zn> SPS>SPS La .
