A kinetic study of diacrylate photopolymerizations

Kurdikar, Devdatt L.; Peppas, Nikolaos A.

doi:10.1016/0032-3861(94)90945-8

Cited by 69 publications

(67 citation statements)

References 9 publications

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“…This is why microheterogeneity for a polymerizing system was not disputed even in works 2,7,10,15 which were observed to DCR conception. Quite the reverse, this factor is taken into account for explanation of the high concentration of radicals stored via polymerization proceeding at the expense of their trapping 6 by a solid polymeric matrix.…”

Section: Introductionmentioning

confidence: 91%

“…The main general ones are (1) the S-like shape of the kinetic curves, indicating the presence of autoacceleration and autodecelation processes; (2) a great posteffect, that is, being dark after UV illumination, stopping the postpolymerization process observed from the autoacceleration stage; and (3) a high (to 10 Ϫ1 mol/m 3 ) concentration of radicals discovered by EPR spectroscopy "in situ" until the end of the polymerization process. [1][2][3][4][5][6][7][8] Two main conceptions have been formulated with the aim of explanation of such peculiarities for the polymerization process to high conversion. The first is based upon the diffusion-controlled character of elementary reactions assigned to the classic kinetic scheme.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic model of block photopolymerization of glycidyl methacrylate to high conversion

Medvedevskikh

Bratus

Hafiychuk

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The kinetics of glycidyl methacrylate block polymerization to high conversion was experimentally investigated with variations of the photoinitiator concentration, temperature, and power of UV illumination. The kinetic curves of this polymerization process contain three characterized sections of coordinates of "conversion-time," namely: The first one is practically linear to a conversion of Ϸ0.5, the second represents, by itself, the autoacceleration process, and the third presents the autodecelation process. An additional peculiarity of such a polymerization process is poor reproduction of the kinetic measurements. This reproduction does not correspond to instrumental error. Derivation of a kinetic model for block linear polymerization was done. This model is, quantitatively, in good agreement with all the data of the experimental material.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Kinetic model of block photopolymerization of glycidyl methacrylate to high conversion

Medvedevskikh

Bratus

Hafiychuk

et al. 2002

J of Applied Polymer Sci

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“…The lower reactivity of methacrylates compared to acrylates is not specifi c to VUV-induced photopolymerization reactions but is well known in (photo)polymerization. [42][43][44] …”

Section: Acrylate and Methacrylate Monomersmentioning

confidence: 99%

VUV‐Induced Photopolymerization of Acrylates

Scherzer

2011

Macro Chemistry & Physics

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Acrylates and methacrylates are photopolymerized without photoinitiator by exposure to 172 nm radiation. The kinetics of the polymerization is studied using real-time Fourier-transform infrared attenuated total refl ectance (FTIR-ATR) spectroscopy. It is shown that layers with a thickness of ≈ 500 nm can be polymerized very rapidly. The effect of structure, viscosity, functionality, and absorption of the acrylates as well as the infl uence of temperature and oxygen concentration on the reactivity are studied. A strong conversion gradient is observed in layers up to ≈ 2 μ m thickness, which refl ects the intensity gradient within the layer. However, the penetration of the polymerization into the layer exceeds the initial penetration depth of the VUV radiation, which indicates strong bleaching of the acrylates during irradiation.

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“…Increasing the chain length increases the chain flexibility so that the conversion at the onset of autodecceleration (and hence R max p ) is retarded (i.e. at later/higher conversion); this phenomenon has also been observed in the polymerization of other kinds of (meth)acrylates [9,10,23].…”

Section: Polymerization Rate and Conversionmentioning

confidence: 88%