TY - JOUR
T1 - Melt-stable poly(1,4-dioxan-2-one) (Co)polymers by ring-opening polymerization via continuous reactive extrusion
AU - Raquez, Jean Marie
AU - Degee, Philippe
AU - Dubois, Philippe
AU - Balakrishnan, Sunder
AU - Narayan, Ramani
PY - 2005/4/1
Y1 - 2005/4/1
N2 - Bulk polymerization of ε-caprolactone (CL), 1,4-dioxan-2-one (PDX), and mixtures of PDX and CL was carried out by initiation with Al(O secBu)3 in a co-rotating twin-screw extruder through a fast single-step process. Both homopolymerizations and copolymerization of PDX and CL proceed very rapidly and reach almost complete (co)monomer(s) conversion as soon as 8 mol% of CL are added in the feed. Even though poly(1,4-dioxan-2- one) (PPDX) is known to thermally degrade mainly through unzipping depolymerization promoted from the hydroxyl end-groups and yielding PDX monomer, it tums out that the thermal stability of PPDX chains is substantially improved by the copolymerization of PDX with limited amounts of CL Interestingly, DSC analysis of the so-obtained P(PDX-co-CL) copolymers has demonstrated that a CL molar fraction as high as 11 mol% does not prevent the crystallization of the resulting copolymer, which retains a melting temperature close to 95°C. This last observation has been explained by the formation of a blocky-like copolymer structure, in which short PPDX and PCL sequences are randomly distributed.
AB - Bulk polymerization of ε-caprolactone (CL), 1,4-dioxan-2-one (PDX), and mixtures of PDX and CL was carried out by initiation with Al(O secBu)3 in a co-rotating twin-screw extruder through a fast single-step process. Both homopolymerizations and copolymerization of PDX and CL proceed very rapidly and reach almost complete (co)monomer(s) conversion as soon as 8 mol% of CL are added in the feed. Even though poly(1,4-dioxan-2- one) (PPDX) is known to thermally degrade mainly through unzipping depolymerization promoted from the hydroxyl end-groups and yielding PDX monomer, it tums out that the thermal stability of PPDX chains is substantially improved by the copolymerization of PDX with limited amounts of CL Interestingly, DSC analysis of the so-obtained P(PDX-co-CL) copolymers has demonstrated that a CL molar fraction as high as 11 mol% does not prevent the crystallization of the resulting copolymer, which retains a melting temperature close to 95°C. This last observation has been explained by the formation of a blocky-like copolymer structure, in which short PPDX and PCL sequences are randomly distributed.
UR - http://www.scopus.com/inward/record.url?scp=17644382653&partnerID=8YFLogxK
U2 - 10.1002/pen.20312
DO - 10.1002/pen.20312
M3 - Article
AN - SCOPUS:17644382653
SN - 0032-3888
VL - 45
SP - 622
EP - 629
JO - Polymer Engineering and Science
JF - Polymer Engineering and Science
IS - 4
ER -