1987
DOI: 10.1002/actp.1987.010380408
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Lichtinduzierte Polymer‐ und Polymerisationsreaktionen. 29. Kinetische Studie der radikalinitiierten Photopolymerisation von Butandiol‐1,4‐dimethacrylat in Poly(vinylpyrrolidon)‐Schichten mit einem isoperibolen Calorimeter

Abstract: Photopolymerisationsreaktionen konnen in Schichten quantitativ mit einem billigen isoperibolen Warmeleitungscalorimeter verfolgt werden, wenn eine numerische Korrektur der MeBdaten erfolgt. Die dazu notwendigen Prozeduren werden mit Hilfe der Ubertragungstheorie abgebildet. Sie verlangen eine einmalige Eichung des Gerates mit einem Warmenadelimpuls. Die durch Benzoin-iso-propylether initiierte radikalische Photopolymerisation von Butandiol-l,4dimethacrylat in Poly(vinylpyrro1idon)-Schichten (etwa 20 p.m Schich… Show more

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Cited by 41 publications
(12 citation statements)
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“…As listed in Table III, for all three pure materials, the intensity exponents β 1 for the reaction rate were found to be smaller than 0.5. This result is in agreement with a similar study45 on multifunctional acrylates, thus indicating the predominance of primary radical termination (reaction of radicals attached to the forming macromolecule with small, mobile, initiator‐derived radicals), and second order termination. The lower value of 0.29 for Acrylated Polyether HBP, compared to 0.35 for DPHA and 0.41 for Acrylated Boltorn H20, indicates that first order termination is more prevalent in Acrylated Polyether HBP, whereas the value of 0.41 for Acrylated Boltorn H20 indicates that in this case second order termination is more frequent.…”
Section: Resultssupporting
confidence: 92%
“…As listed in Table III, for all three pure materials, the intensity exponents β 1 for the reaction rate were found to be smaller than 0.5. This result is in agreement with a similar study45 on multifunctional acrylates, thus indicating the predominance of primary radical termination (reaction of radicals attached to the forming macromolecule with small, mobile, initiator‐derived radicals), and second order termination. The lower value of 0.29 for Acrylated Polyether HBP, compared to 0.35 for DPHA and 0.41 for Acrylated Boltorn H20, indicates that first order termination is more prevalent in Acrylated Polyether HBP, whereas the value of 0.41 for Acrylated Boltorn H20 indicates that in this case second order termination is more frequent.…”
Section: Resultssupporting
confidence: 92%
“…As b was between 0.5 and 1 for all composites, this result indicates that first-order and second-order termination mechanisms occurred simultaneously. In contrast, the work of Schmidt et al 22 and Timpe et al 50 gave values for b smaller than 0.5, indicating that primary radical termination was predominant. The degree of branching (DB) of the acrylated HBP used by the former authors was equal to 0.35, which is lower than that in the present work (0.41).…”
Section: Influence Of Intensitycontrasting
confidence: 39%
“…The value of the exponent b was found to be 0.42, indicating primary radical termination. This result is in agreement with those of Schmidt et al [17] and Timpe et al [45] who also found…”
Section: Kineticssupporting
confidence: 94%