2019
DOI: 10.1021/acs.macromol.8b02530
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Dielectric Relaxation as a Probe To Verify the Symmetrical Growth of Two-Arm Poly(glycidyl phenyl ether) Initiated byt-BuP4/Ethylene Glycol

Abstract: Dielectric relaxation is used to verify the bidirectional growth of arms in poly(glycidyl phenyl ether) (PGPE) synthesized by ring-opening polymerization with ethylene glycol and a phosphazene base, t-BuP 4 , in the presence and absence of triisobutylaluminum (i-Bu 3 Al). The dielectric relaxation is highly sensitive to changes in the dipolar moment orientation along the chain contour, allowing us to precisely identify whether the polymer is composed by "one arm" or "two arms" as well as to verify the arm symm… Show more

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Cited by 5 publications
(17 citation statements)
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References 32 publications
(81 reference statements)
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“…In this way, the results for different samples can be compared under “isofrictional” conditions. For one-arm regioregular linear samples, we found a mass-independent value of ln­[τ NM ( T g,D )/ M 2 ] ≈ 4.9 (τ NM in seconds and M in kg/mol), , in agreement with expectations. Correspondingly, we should expect a mass-independent value of ln­[τ NM ( T g,D )/ M 2 ] ≈ 4.9 – ln4 ≈ 3.5 for polymers constituted by two symmetric inverted-dipole arms. , …”
Section: Resultssupporting
confidence: 90%
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“…In this way, the results for different samples can be compared under “isofrictional” conditions. For one-arm regioregular linear samples, we found a mass-independent value of ln­[τ NM ( T g,D )/ M 2 ] ≈ 4.9 (τ NM in seconds and M in kg/mol), , in agreement with expectations. Correspondingly, we should expect a mass-independent value of ln­[τ NM ( T g,D )/ M 2 ] ≈ 4.9 – ln4 ≈ 3.5 for polymers constituted by two symmetric inverted-dipole arms. , …”
Section: Resultssupporting
confidence: 90%
“…Although the molecular weight could be controlled for low molecular weight targets (i.e., 2 kg/mol < M n < 6 kg/mol), when higher molecular weights were targeted (i.e., M n > 6 kg/mol), the observed molecular weight reached a plateau around 6 kg/mol. This observation has already been made for the polymerization of GPE initiated by ethylene glycol and t -BuP 4 …”
Section: Resultssupporting
confidence: 56%
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