Polymers with controlled degradability through end-modification of poly(α-methylstyrene) derivatives

Nagasaki, Yukio; Yamazaki, Noriyuki; Kato, Masaru

doi:10.1016/0032-3861(96)00275-3

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…Note that in the chain-end depolymerization experiments, the severed monomer is not included in the polymer population, [1,2,6] and N Ã (r) does not include monomers severed from chain ends. On the other hand, however, the total distribution that includes monomers will also be shown in some of the illustrative calculations later.…”

Section: Theoretical Partmentioning

confidence: 99%

“…The living depolymerization has been investigated experimentally, [1,2] and is expected to be a fruitful research area both from the academic and industrial point of view. Although the ideal living polymerization leads to the Poisson distribution that is extremely narrow for large polymers, the broadening of the MWD may occur such as by slow exchange reactions [3,4] even when the activity at the chain end is not lost.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Distribution Change During Irreversible Depolymerization by Chain‐End Scission

Tobita

2007

Macro Theory & Simulations

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The change in polymer distribution during depolymerization in which monomer molecules are severed one by one from the chain ends, is considered. Assuming irreversible depolymerization and equal reactivity of all the chain ends, a general formula to calculate the MWD is proposed. After the removal of monomers severed from the chains, the MWDs of depolymerized polymers always approach the most probable distribution whose PDI is practically equal to 2. It may appear to be counterintuitive, but the average MWs of polymers may increase during chain scission when the initial distribution is broader than the most probable (PDI > 2). The interpretation of the MWD data of polymers during depolymerization, such as those obtained by GPC, are not straightforward especially for the initial broad MWDs.magnified image

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Section: Theoretical Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer Distribution Change During Irreversible Depolymerization by Chain‐End Scission

Tobita

2007

Macro Theory & Simulations

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“…The resulting polymer is a thermodynamically unstable solid that can be heated well above the ceiling temperature. Poly(a-methyl Table 2 The sacrificial polymers (Unity 2207P, Unity 2507P, Unity 3807P, and Unity 4411) and dielectric overcoat materials compatibility chart [78] styrene), with a ceiling temperature of 61 C, synthesized in this manner showed a thermal decomposition temperature above 300 C [82]. A stimulus, which acts to destabilize the polymer endcaps, can cause the polymer to rapidly depolymerize and revert back to monomer either at room temperature or slightly elevated temperatures [83].…”

Section: Low Ceiling Temperature Polymersmentioning

confidence: 99%

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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“…For example, the onset temperature of the thermal degradation of PMS derivatives with a 2-phenylallyl end group was more than 50 °C lower than that of hydrogen terminated polymer. [8] This paper communicates the synthesis of aminoended PMS, and evaluation as the positive EB resist characteristics by the dry develonment. As we reported previously [7] [8], the end modification of PMS by 2-phenylallyl group was effective to the EB exposure.…”

Section: Introductionmentioning

confidence: 99%

Dry-Developable Electron-Beam Resist. Synthesis and Resist Characteristic Evaluation of Amino-ended Poly(.ALPHA.-Methylstyrene).

Hirakawa

Tokuda

Aoki

et al. 2000

J. Photopol. Sci. Technol.

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Polymers with controlled degradability through end-modification of poly(α-methylstyrene) derivatives

Cited by 7 publications

References 10 publications

Polymer Distribution Change During Irreversible Depolymerization by Chain‐End Scission

Polymer Distribution Change During Irreversible Depolymerization by Chain‐End Scission

Decomposable and Template Polymers: Fundamentals and Applications

Dry-Developable Electron-Beam Resist. Synthesis and Resist Characteristic Evaluation of Amino-ended Poly(.ALPHA.-Methylstyrene).

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