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Volumn 44, Issue 10, 2006, Pages 3233-3241

Sequence-controlled cationic ring-opening copolymerization of spiroorthocarbonate and oxetane

Author keywords

Block copolymers; Cationic polymerization; Ring opening polymerization

Indexed keywords

BORON COMPOUNDS; CATIONIC POLYMERIZATION; COPOLYMERIZATION; RING OPENING POLYMERIZATION; SYNTHESIS (CHEMICAL);

EID: 33646879010     PISSN: 0887624X     EISSN: 10990518     Source Type: Journal    
DOI: 10.1002/pola.21380     Document Type: Article
Times cited : (10)

References (37)
  • 5
    • 21844463990 scopus 로고
    • Ivin, K. J.; Saegusa, T., Eds.; Elsevier: London
    • (c) Ring-Opening Polymerization; Ivin, K. J.; Saegusa, T., Eds.; Elsevier: London, 1984; Vol. 1, p 218;
    • (1984) Ring-opening Polymerization , vol.1 , pp. 218
  • 6
    • 0002330341 scopus 로고
    • Eastmond, G. C.; Ledwith, A.; Russo, S.; Sigwalt, P., Eds.; Pergamon: Oxford
    • (d) Covie, J. E. In Comprehensive Polymer Science; Eastmond, G. C.; Ledwith, A.; Russo, S.; Sigwalt, P., Eds.; Pergamon: Oxford, 1989; Vol. 3, p 17;
    • (1989) Comprehensive Polymer Science , vol.3 , pp. 17
    • Covie, J.E.1
  • 25
    • 0024071682 scopus 로고
    • Because the DSC measurements were carried out in the range of -65 to 60°C, only the glass-transition temperature corresponding to the poly (SOC1) segment (-59°C) could be detected. The glass-transition temperature corresponding to the poly(OX) segment (-71°C), which was reported by Perez et al. (Polym Bull 1988, 20, 291), could not be detected.
    • (1988) Polym Bull , vol.20 , pp. 291
    • Perez1
  • 27
    • 33646865826 scopus 로고    scopus 로고
    • note
    • A plausible initiating species is a proton contained in BF3OEt2 or produced during the initial oligomerization process (see ref. 9). Because the initiation efficiency is constant, the lower initiation efficiency can be ascribed to neither the impurities in the solvent or SOC1 nor the protons on glassware.
  • 28
    • 33646891418 scopus 로고    scopus 로고
    • note
    • The observed pseudo-first-order polymerization rate constant (kobs) was calculated according to -d[M]/dt = k[P*][M] = kobs[M], where [P*] is the concentration of the propagating end and [M] is the concentration of the monomer.
  • 29
    • 33646895550 scopus 로고    scopus 로고
    • note
    • There is a possibility that some of the precursor, poly(OX), is still present in the copolymer (trace b). However, because of the small change in the molecular weight distribution during the copolymerization, the amount of poly(OX) is considered to be small. Therefore, the properties of the obtained copolymers might not be affected so much by the remaining poly(OX).
  • 30
    • 33646869810 scopus 로고    scopus 로고
    • note
    • The fact that the copolymer compositions are 54:46 and 57:43 for the pseudo block and triblock copolymers, respectively, whereas the feed ratio is 50:50, can be ascribed to the formation of the oligomers of OX in the early stages of the copolymerization. Because the oligomers can be removed by precipitation with hexane, the resulting copolymers do not include the oligomers.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.