Radical Chain Polymerization

Odian, George

doi:10.1002/047147875x.ch3

Cited by 89 publications

(20 citation statements)

References 308 publications

(374 reference statements)

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“…As the concentration of monomer decreases, the ceiling temperature of the polymerization also decreases. While most of the ceiling temperatures shown are not useful for a thermodynamically unstable polymer at room temperature, low ceiling temperature polymers (T c < 70 C) offer the use of moderate to low temperatures to drypattern features or cavities [80,81].…”

Section: Low Ceiling Temperature Polymersmentioning

confidence: 99%

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Decomposable and Template Polymers: Fundamentals and Applications

Uzunlar

Schwartz

Phillips

et al. 2016

Journal of Electronic Packaging

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Polymers can be used as temporary place holders in the fabrication of embedded air gaps in a variety of electronic devices. Embedded air cavities can provide the lowest dielectric constant and loss for electrical insulation, mechanical compliance in devices where low-force deformations are desirable, and can temporarily protect movable parts during processing. Several families of polymers have been used as sacrificial, templating polymers including polycarbonates, polynorbornenes (PNBs), and polyaldehydes. The families can be distinguished by chemical structure and decomposition temperature. The decomposition temperature ranges from over 400 °C to below room temperature in the case of low ceiling temperature polymers. Overcoat materials include silicon dioxide, polyimides, epoxy, and bis-benzocyclobutene (BCB). The methods of air-gap fabrication are discussed. Finally, the use of photoactive compounds in the patterning of the sacrificial polymers is reviewed.

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Section: Low Ceiling Temperature Polymersmentioning

confidence: 99%

“…Dielectric overcoat material Overcoat solvent Unity 2207P Unity 2507P Unity 3807P Unity 4411 1 Avatrel EPM TM Mesitylene G B B B 2 Avatrel 2090P TM Mesitylene G B B B 3 Sumiresin Excel CRC-8650 GBL B B B B 4 PI-2611 NMP B B B G 5 PI Ceiling temperature is reported for pure monomer [80,114,123].…”

Section: Entrymentioning

confidence: 99%

Decomposable and Template Polymers: Fundamentals and Applications

Uzunlar

Schwartz

Phillips

et al. 2016

Journal of Electronic Packaging

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“…In general, measured T g is higher than predicted. 20 In the case of low HEMA content (1-5 mol%), with all three BA to St ratios, no significant changes are found in T g as HEMA content is increased slightly. When more HEMA content is used (10-40 mol%), T g increases significantly with increasing HEMA content in formulation, as expected, regardless of BA to St ratio.…”

Section: Glass Transition Temperaturementioning

confidence: 81%

Secondary nucleation of styrenated hydroxyl‐functionalized latexes

Ocepek

Soucek

2021

J of Applied Polymer Sci

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In this study, secondary nucleation in emulsion polymerization of butyl acrylate (BA), styrene (St), and 2-hydroxyethyl methacrylate (HEMA), was investigated. Different molar ratios of BA and St were used. Average particle size, particle size distribution (PSD), polymerization kinetics, glass transition temperature (T g), and surface tension were monitored and compared. All synthetic latexes were prepared through seeded semi-batch emulsion polymerization process. Three different BA to St ratios (1:1, 1:2, 2:1) were combined with eight different HEMA contents (0, 1, 3, 5, 10, 20, 30, 40 mol%) in monomer composition, respectively. In the case of high HEMA content (10-40 mol%) it is found that secondary nucleation is mainly affected by HEMA. Secondary nucleation at low HEMA content (1-5 mol%) is dependent on the BA to St monomer ratio, and consequently a reflection of z-mer hydrophobicity.

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“…PHPMA main degradation peak is centered at 322 C, while the one from PBS is at 406 C. This phenomenon is due to the depolymerization of the PHPMA under higher temperatures. [31] In turn, the PBSgPHPMA copolymer presents a degradation peak around 410 C, showing increased thermal stability compared to the homopolymers, since it has a degradation peak higher than its both homopolymers, specially PHPMA. This is possibly due to the cross-linking side-reactions between the PHPMA portions of the sample, which made the copolymer more thermally stable.…”

Section: Macromolecular Symposiamentioning

confidence: 99%

Poly (Butylene Succinate)‐g‐Poly(Hydroxypropyl Methacrylate) as a New Meloxican Delivery System

Costa

Pinto

Nascimento

et al. 2018

Macromolecular Symposia

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The use of biopolymer‐based drug delivery systems is increasing in the pharmaceutical area due to them biodegradable and biocompatible properties. In this work, a poly (butylene succinate) (PBS) grafted with poly (hydroxypropyl methacrylate) (PHPMA), PBSgPHPMA, is prepared using maleic unsaturations inserted in the PBS chain during its synthesis. Several characterization techniques are used to study the homopolymers and the grafted material. Among them, Fourier Transform Infrared (FTIR), Thermogravimetric analysis (TGA) Differential scanning calorimetry (DSC), and X‐ray diffraction (XRD) allowed inferring the obtaining of the aimed materials. Also, the copolymer is used to prepare microparticles containing Meloxicam by emulsification and solvent evaporation method. These microparticles are tested as drug delivery systems under pH 8.5 (gastrointestinal) and pH 5.5 (skin). The primary results allowed inferring that the grafted material can be used as a drug delivery system, showing that the release rate at pH 5.5 allowed the slower delivery rate among tested materials.

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Radical Chain Polymerization

Cited by 89 publications

References 308 publications

Decomposable and Template Polymers: Fundamentals and Applications

Decomposable and Template Polymers: Fundamentals and Applications

Secondary nucleation of styrenated hydroxyl‐functionalized latexes

Poly (Butylene Succinate)‐g‐Poly(Hydroxypropyl Methacrylate) as a New Meloxican Delivery System

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