TY - JOUR
T1 - The average properties of block copolymers formed via the one-prepolymer method and the two-prepolymer method
AU - Shiau, Lie Ding
PY - 2001/3/26
Y1 - 2001/3/26
N2 - Full Paper: In this paper, a model is developed for determining the average properties of block copolymers formed via the one-prepolymer and the two-prepolymer methods. A knowledge of the average properties of reacting prepolymers, instead of their whole molecular weight distribution (MWD), is sufficient to calculate the desired average molecular weights of the resultant block copolymers. M̄n, M̄wand polydispersity index (PI) of the block copolymers formed via the one-prepolymer and two-prepolymer are studied in detail for comparison. The simulation results indicate that M̄n,1pn,2p and M̄w,1pbw,2p in the range 0≤α< 1, while M̄n,1p = M̄n,2p and M̄w,1p = M̄w,2p when α = 1. In addition, the conversion (α) does not significantly influence PI2p, while PI1p decrease linearly with increasing α. The results also show that PI1p> PI2p in the range 0 ≤ α<1. Finally, PI1p and PI2p approach the same value at α = 1. This indicates that the polydispersity of the block copolymers formed via the two-prepolymer method is usually narrower than that of the block copolymers formed via the one-prepolymer method. A schematic illustration of the block copolymerization of prepolymer A and prepolymer B (the two-prepolymer method).
AB - Full Paper: In this paper, a model is developed for determining the average properties of block copolymers formed via the one-prepolymer and the two-prepolymer methods. A knowledge of the average properties of reacting prepolymers, instead of their whole molecular weight distribution (MWD), is sufficient to calculate the desired average molecular weights of the resultant block copolymers. M̄n, M̄wand polydispersity index (PI) of the block copolymers formed via the one-prepolymer and two-prepolymer are studied in detail for comparison. The simulation results indicate that M̄n,1pn,2p and M̄w,1pbw,2p in the range 0≤α< 1, while M̄n,1p = M̄n,2p and M̄w,1p = M̄w,2p when α = 1. In addition, the conversion (α) does not significantly influence PI2p, while PI1p decrease linearly with increasing α. The results also show that PI1p> PI2p in the range 0 ≤ α<1. Finally, PI1p and PI2p approach the same value at α = 1. This indicates that the polydispersity of the block copolymers formed via the two-prepolymer method is usually narrower than that of the block copolymers formed via the one-prepolymer method. A schematic illustration of the block copolymerization of prepolymer A and prepolymer B (the two-prepolymer method).
UR - http://www.scopus.com/inward/record.url?scp=0035953095&partnerID=8YFLogxK
U2 - 10.1002/1521-3919(20010301)10:3<179::AID-MATS179>3.0.CO;2-F
DO - 10.1002/1521-3919(20010301)10:3<179::AID-MATS179>3.0.CO;2-F
M3 - 文章
AN - SCOPUS:0035953095
SN - 1022-1344
VL - 10
SP - 179
EP - 186
JO - Macromolecular Theory and Simulations
JF - Macromolecular Theory and Simulations
IS - 3
ER -