Investigation of thermally activated or photoinitiated polymerization by DSC

Flammersheim, H.‐J.

doi:10.1007/bf01914584

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…For the purpose of the area determination, the baseline is defined as the plateau in heat flow before the shutter is closed. 9 As shown in Figure 5, the plateau in heat flow occurs between 20 and 50 minutes. The step-decrease in the heat flow at 50 minutes occurs when the shutter is closed.…”

Section: Differential Photo-calorimetry (Dpc)mentioning

confidence: 93%

Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer

Whitehead

Gill

2001

SPIE Proceedings

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This paper investigates the effects of cure temperature and composition on the morphology of polymer dispersed liquid crystals (PDLCs) composed of the liquid crystal, K21 (4-heptyl-4'-cyanobiphenyl), in a thiol-ene based pre-polymer. PDLCs are composites composed of micron-sized liquid crystal droplets dispersed in a solid polymer matrix. The PDLCs were fabricated by photo-initiated, polymerization induced phase separation using a differential photo-calorimeter (DPC). The cure temperatures were chosen based on the temperature-composition phase diagrams of the liquid crystal/pre-polymer mixtures. The characterization of the PDLCs included differential scanning calorimetry (DSC) to determine the nematic-toisotropic transition temperature (T NI ) of the liquid crystal and the glass transition temperature (Tg) of the polymer matrix. Scanning electron microscopy (ESEM) was used to examine phase separated morphology.

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Section: Differential Photo-calorimetry (Dpc)mentioning

confidence: 93%

Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer

Whitehead

Gill

2001

SPIE Proceedings

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“…The following principal reactions occurred: electron transfer between excited anthracene and MMA (k q ¼ 2.5Â 10 9 M À1 sec À1 ), quenching of excited anthracene by MMA (k q ¼ 1.3Â 10 7 M À1 sec À1 ), reaction between an anthracene-I-salt complex and MMA. [35] Various photoinduced reactions on polymers and applications of these reactions have been discussed in great detail. It was also assumed that only the quenching of anthracene by MMA ( p ¼3.8) and the addition of free radicals, produced by the photoinduced electron transfer, led to polymer formation.…”

Section: Free Radical Photopolymerizationmentioning

confidence: 99%

Photopolymerization: A Review

Kaur

Srivastava

2002

Journal of Macromolecular Science, Part C: Polymer Reviews

126

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Free‐Radical stabilizers for the thiol/ene‐systems

Klemm¹,

Sensfuß²,

Holfter³

et al. 1993

Angew. Makromol. Chem.

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By means of calorimetric investigations it is shown that dithioVdiene-mixtures show a more or less distinct spontaneous dark reaction, without light and in the absence of initiators. Pyrogallol, hydroquinone and catechol were tested as stabilizers. The efficacy of the stabilizer to transform the radicals resulting from charge transfer interaction of the thiol with the ene component into an inactive species decreases in the order mentioned above. ZUSAMMENFASSUNG:DSC-Untersuchungen von DithioVDien-Mischungen zeigen, daB diese Systeme unter Lichtausschlun und in Abwesenheit von Sauerstoff eine mehr oder weniger deutlich ausgepragte Dunkelreaktion aufweisen. Als Stabilisatoren wurden Pyrogallol, Hydrochinon und Brenzkatechin getestet. Ihre Wirksamkeit, die aus der Charge-Transfer-Wechselwirkung des Thiols mit dem Dien resultierenden Radikale zu desaktivieren, sinkt in der genannten Reihenfolge.

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Investigation of thermally activated or photoinitiated polymerization by DSC

Cited by 4 publications

References 20 publications

Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer

Characterization of PDLCs composed of the single liquid crystal component, K21, in a thiol-ene-based polymer

Photopolymerization: A Review

Free‐Radical stabilizers for the thiol/ene‐systems

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