120 ns 128 k*8 b/64 k*16 b CMOS EEPROMs

Terada,; Kobayashi, Kazuya; Nakayama,; Hayashikoshi,; Miyawaki,; Ajika,; Matsukawa,; Yoshihara,

doi:10.1109/isscc.1989.48210

Cited by 3 publications

(8 citation statements)

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“…It is assumed that the inhibition of polymerization was due to deactivation of the catalyst by intramolecular coordination of the monomer amide carbonyl to the ruthenium center (negative neighboring group effect). [ 4,7,8 ] The diene 1b , on the other hand, has a by one methyl ene unit longer alkyl linker, hence deactivation of the catalyst should be less favorable or suppressed. The polymerization of 1b with the HG-2 catalyst ([1b]:[HG-2] = 1:0.05) was performed in refl uxing DCM solution (preferred solvent for ADMET polymerizations) [ 15 ] in the absence and presence of benzoquinone.…”

Section: Polymerizations (General Procedures)mentioning

confidence: 99%

“…Average molar masses of polymers obtained with 1b are considerably higher than with 1a , confi rming the importance of the distance between double bond and amide carbonyl group for the polymerizability of 1,4-dialkenyl-2,5-diketopiperazines (see also ref. [ 8 ] ). However, the molar mass distributions appear to be bi-or even multimodal (SEC, Figure 1 ).…”

Section: Polymerizations (General Procedures)mentioning

confidence: 99%

“…ADMET polymerization yielded semicrystalline polyesteramides with molar masses up to 33 kg mol −1 . Sanda and co-workers [ 8 ] prepared amino acid-derived dienes by esterifi cation of L -glutamic acid diketopiperazine with ω-alkenyl alcohols. Best results, i.e., polyesteramides with molar masses up to 15 kg mol −1 , were obtained when using a Hoveyda-Grubbs ruthenium complex.Here, we report on the fi rst results on the ADMET polymerization of 1,4-dialkenyl-2,5-diketopiperazine to produce bio-derived tertiary polyamides, which in a wider sense can be classifi ed as polypeptoids [ 9 ] (as distinguished from the secondary poly(ester)amides described by Wagener and co-workers).…”

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ADMET Polymerization of Amino‐Acid‐Based Diene

Führer

Schlaad

2014

Macro Chemistry & Physics

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1,4‐Di(homo)allyl‐2,5‐diketopiperazines are synthesized and polymerized via ADMET using the Hoveyda–Grubbs 2nd generation catalyst. The but‐3‐enylated diketopiperazine can be converted into unsaturated tertiary polyamide with molar mass of <3000 g mol−1, whereas the allylated diketopiperazine cannot. Double‐bond isomerization occurs regardless of whether or not benzoquinone is present. A polyesteramide with a higher molar mass of ca. 4800 g mol−1 is obtained by the alternating copolymerization (ALTMET) of 1,4‐di(but‐3‐enyl)‐2,5‐diketopiperazine and ethylene glycol diacrylate. A post‐polymerization modification of the poly(ester)amides via radical thiol‐ene chemistry, however, fails.

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Section: Polymerizations (General Procedures)mentioning

confidence: 99%

Section: Polymerizations (General Procedures)mentioning

confidence: 99%

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confidence: 99%

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ADMET Polymerization of Amino‐Acid‐Based Diene

Führer

Schlaad

2014

Macro Chemistry & Physics

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“…For instance, a variety of amino acid, peptide, plant oil, and fatty acid derivatives have been smoothly polymerized through ADMET. [31,[36][37][38][39][40] It should be noted here that since none of those biological molecules originally include α,ω-diene structure, some chemical modifications have been performed to convert those compounds into a polymerizable monomer. Inspired by those studies, we envisioned that we can convert l-ascorbic acid to a α,ωdiene structure and polymerize it through ADMET.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(vitamin C) through ADMET

Luleburgaz

Abuaf

Tunca

et al. 2017

Macromol. Rapid Commun.

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l-Ascorbic acid, commonly known as vitamin C and one of the most important biological compounds, is converted to a α,ω-diene monomer and subsequently polymerized for the first time by acyclic diene metathesis. Various experimental conditions such as polymerization medium, catalyst type, temperature, and monomer/catalyst ratio are studied. The moderate molecular weight polymers are achieved when the polymerizations are conducted under bulk conditions employing the Grubbs first generation (G1) or Hoveyda-Grubbs second generation catalyst (HG-2). In the solution case, on the other hand, low molecular weight polymers are obtained regardless of the catalyst type. Moreover, when the catalyst performances are compared, it is found that G1 produces the higher molecular weight as well as higher yield polymers with respect to the HG-2.

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Synthesis of supramolecular precision polymers: Crystallization under conformational constraints

Reimann

Danke

Beiner

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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Placing artificial folding elements into precision polymers is an important strategy to systematically study structure formation in self‐assembly, particularly in the semicrystalline state. To this purpose, a series of precision polymers bearing either a N‐protected or N‐unprotected diaminopyridine (DAP) unit after every 16th, 18th, and 20th carbon as well as a urea unit after every 20th carbon along a polyethylene‐like polymer were synthesized via acyclic diene metathesis polymerization and subsequent hydrogenation. The polymers thus contain either H‐bonds (urea/DAP), π–π‐elements (DAP), or no H‐bonds (respective Nprotected urea/DAP‐units) in their main chain, able to consequently study the crystallization behavior under influence of such supramolecular moieties. Therefore, the thermal properties and crystallization behavior were analyzed via differential scanning calorimetry (DSC) as well as wide angle X‐ray diffraction. The obtained crystalline polymer is influenced by the different supramolecular interactions existing between adjacent polymer chains and the varying defect size exerted by the incorporated functional groups. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3736–3748

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120 ns 128 k8 b/64 k16 b CMOS EEPROMs

Cited by 3 publications

References 0 publications

ADMET Polymerization of Amino‐Acid‐Based Diene

ADMET Polymerization of Amino‐Acid‐Based Diene

Synthesis of Poly(vitamin C) through ADMET

Synthesis of supramolecular precision polymers: Crystallization under conformational constraints

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