UV-Curable Conformal Coatings

Morgan, C. R.; Kyle, D. R.; Bush, Richard W.

doi:10.1021/bk-1984-0242.ch029

Cited by 2 publications

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“…It was therefore considered of interest to synthesize LPS containing methacrylate groups. Such novel materials may find newer applications since methacrylates are widely used as speciality coatings and adhesives in the microelectronics, engineering, and telecommunications industries 15. In the present article, apart from the synthesis, both characterization and bulk polymerization kinetics of such polymers are reported.…”

Section: Introductionmentioning

confidence: 95%

Synthesis, Characterization, and Polymerization Kinetics of Novel Ladder‐Like Polysilsesquioxanes Containing Side‐Chain Propyl Methacrylate Groups

Krishnan

2003

Macro Chemistry & Physics

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Three ladder‐like polysilsesquioxanes containing side‐chain propyl methacrylate groups have been synthesized successfully by stepwise coupling polymerization. The prepared ladder‐like polymers are polysilsesquioxanes containing 100 mol‐% propyl methacrylate side groups and two copolymers containing 70 mol‐% methyl or phenyl groups and 30 mol‐% propyl methacrylate side groups. They were characterized by FT‐IR, 1H NMR, proton‐decoupled 13C NMR, and 29Si NMR spectroscopies, gel‐permeation chromatography (GPC), wide‐angle X‐ray diffraction (XRD), differential scanning calorimetry (DSC), and thermo‐gravimetric analysis (TGA). Characterization data indicate that these polymers have ordered ladder‐like structures with possible defects. At appropriate conditions, crystals of homopolymer were grown and are in the shape of a parallelogram. All three polymers were cured by 2,2′‐azoisobutyronitrile (1% w/w) and the kinetics for the bulk polymerization of these polysilsesquioxanes was followed by dynamic DSC method. Ozawa and Kissinger methods were used to calculate the activation energy for curing. Both the frequency factor and the activation energy of the homopolymer were found to be higher than the copolymers. Cured samples had a higher thermal stability than uncured samples.

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Section: Introductionmentioning

confidence: 95%

Synthesis, Characterization, and Polymerization Kinetics of Novel Ladder‐Like Polysilsesquioxanes Containing Side‐Chain Propyl Methacrylate Groups

Krishnan

2003

Macro Chemistry & Physics

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Studies on the kinetics of free‐radical bulk polymerization of multifunctional acrylates by dynamic differential scanning calorimetry

Thakur

Banthia

Maiti

1995

J of Applied Polymer Sci

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SYNOPSISThe course and kinetics of nonisothermal bulk polymerization of multifunctional acrylates were studied by dynamic differential scanning calorimetry (DSC). Measurements were carried out for four straight-chain monomers, diethylene glycol diacrylate (DEGDA), triethylene glycol diacrylate (TEGDA), tetraethylene glycol diacrylate (TTGDA), and poly(ethy1ene glyco1)diacrylate (PEGDA) (mol. wt. 600), to study the effect of the backbone chain length, atmosphere, and type of initiator on the crosslinking kinetics. 4,4'-Azobis(4-cyanovaleric acid) (1.0%, w/w) was used as a free-radical initiator. From the dynamic scanning of polymerization of DEGDA at five heating rates (2-3O0C/min), the average heat of polymerization (AH,) was found to be 524.2 J/g. An activation energy of 108.8 kJ/ mol and preexponential factor 5.34 X lo'* s-l were obtained from the Arrhenius plot, In daldt. The rate of polymerization was found manyfold greater at 20-60% conversion than at the initial stage (2-8% conversion). Polymerization was studied under both nitrogen and air atmosphere. The results corresponded well with the theory of oxygen inhibition. Different types of initiators, e.g., 4,4'-azobis(4-~yanovaleric acid) (ABCVA), 2,2'-azobisisobutyronitrile (AIBN), and benzoyl peroxide (BPO) were used for polymerization and ABCVA was found to be the most efficient among all. 0 1995 John Wiley & Sons, Inc.

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UV-Curable Conformal Coatings

Cited by 2 publications

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Synthesis, Characterization, and Polymerization Kinetics of Novel Ladder‐Like Polysilsesquioxanes Containing Side‐Chain Propyl Methacrylate Groups

Synthesis, Characterization, and Polymerization Kinetics of Novel Ladder‐Like Polysilsesquioxanes Containing Side‐Chain Propyl Methacrylate Groups

Studies on the kinetics of free‐radical bulk polymerization of multifunctional acrylates by dynamic differential scanning calorimetry

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