Search Results - "Schwarz, Gert"

Cyclic and Noncyclic Polycarbonates of Isosorbide (1,4:3,6-Dianhydro-d-glucitol) by Chatti, Saber, Schwarz, Gert, Kricheldorf, Hans R

“…Three different synthetic methods were studied with respect to their usefulness for the preparation of poly(isosorbide carbonate) (PIC). Thermal…”
Get full text

Cyclic Polylactides by Imidazole-Catalyzed Polymerization of l-Lactide by Kricheldorf, Hans R, Lomadze, Nino, Schwarz, Gert

“…Heating of l-lactide with imidazole to 98−100 °C resulted in complete polymerization within 48 h. Even-numbered cycles resulting from end-to-end cyclization…”
Get full text

Cyclic Polymers by Kinetically Controlled Step-Growth Polymerization by Kricheldorf, Hans R., Schwarz, Gert

“…The theory of step‐growth polymerizations including the cascade theory is discussed in the light of new results focussing on the role of cyclization reactions…”
Get full text

Aliphatic Polyesters by Bismuth Triflate-Catalyzed Polycondensations of Dicarboxylic Acids and Aliphatic Diols by Buzin, Pavel, Lahcini, Mohammed, Schwarz, Gert, Kricheldorf, Hans R

“…Polycondensations of aliphatic dicarboxylic acids (ADAs) with 1,4-butane or 1,6-hexane diol were conducted in bulk at 80 or 100 °C. Temperature and…”
Get full text

Polymerization of Cyclosiloxanes by Means of Triflic Acid and Metal Triflates by Yashiro, Takao, Kricheldorf, Hans R., Schwarz, Gert

“…Hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), and decamethylcyclopentasiloxane (D5) were equilibrated with potassium tert‐butoxide or…”
Get full text

Primary Amine-Initiated Polymerizations of Alanine-NCA and Sarcosine-NCA by Kricheldorf, Hans R., von Lossow, Colin, Schwarz, Gert

“…Sarcosine‐N‐carboxyanhydride (Sar‐NCA), L‐alanine‐NCA and D,L‐alanine‐NCA were polymerized with benzylamine as initiator in three different solvents:…”
Get full text

Telechelic polyesters of ethane diol and adipic or sebacic acid by means of bismuth carboxylates as non-toxic catalysts by Kricheldorf, Hans R., Behnken, Gesa, Schwarz, Gert

“…Dimethyladipate or dimethylsebacate were polycondensed with an excess of 1,2-ethane diol in bulk using two different temperature/time programs. Bismuth(III)…”
Get full text

Primary Amine and Solvent-Induced Polymerizations of L- or D,L-Phenylalanine N-Carboxyanhydride by Kricheldorf, Hans R., v. Lossow, Colin, Schwarz, Gert

“…Benzylamine, hexylamine and aniline‐initiated polymerizations of D,L‐phenylalanine and L‐phenylalanine N‐carboxyanhydride (D,L‐Phe‐NCA and L‐Phe‐NCA) were…”
Get full text

Tertiary Amine‐Initiated Zwitterionic Polymerization of Pivalolactone—A Reinvestigation by Means of MALDI‐TOF Mass Spectrometrya by Kricheldorf, Hans R., Garaleh, Mazen, Schwarz, Gert

Get full text

Poly(thioester)s by Kricheldorf, Hans R., Schwarz, Gert

“…Syntheses and properties of aliphatic and aromatic polythioesters (PTEs) were reviewed including polythiocarbonates and polythiourethanes. The content is…”
Get full text

Cyclic Poly(thioglycolide) and Poly(d,l-thiolactide) by Zwitterionic Polymerization of Dithiolane-2,4-diones by Kricheldorf, Hans R, Lomadze, Nino, Schwarz, Gert

“…Dithiolane-2,4-dione was polymerized either by heating in bulk to 140 °C or by reacting at 20 °C using pyridine and triethylamine as catalysts. Whereas the…”
Get full text

Whiskers. 12. Whisker-like Crystals of Poly(4'-hydroxybiphenyl-4-carboxylic acid) by Schwarz, Gert, Kricheldorf, Hans R

Get full text

Cyclic Polypeptides by Solvent-Induced Polymerizations of α-Amino Acid N-Carboxyanhydrides by Kricheldorf, Hans R, von Lossow, Colin, Schwarz, Gert

“…Solutions of dl-phenylalanine-NCA in eight different solvents were thermostated at 20 °C for 4 days (and in two cases at 60 °C) without addition of initiators…”
Get full text

Telechelic and Star-Shaped Poly(l-lactide)s by Means of Bismuth(III) Acetate as Initiator by Kricheldorf, Hans R, Hachmann-Thiessen, Heiko, Schwarz, Gert

“…l-Lactide was polymerized as concentrated solution in chlorobenzene with Bi(OAc)3 as initiator. When tetra(ethylene glycol) was added as co-initiator (CoI),…”
Get full text

Multicyclic Polyesters by Polycondensation of 5,5‘,6,6‘-Tetrahydroxy-3,3,3‘,3‘-tetramethylspirobisindane with Dicarboxylic Acid Dichlorides by Kricheldorf, Hans R, Bornhorst, Kirstin, Schwarz, Gert

“…5,5‘,6,6‘-Tetrahydroxy-3,3,3‘,3‘-tetramethylspirobisindane (TTSBI) was polycondensed with 2 equiv of sebacoyl chloride or 1,6-hexanediol bischloroformiate…”
Get full text

High Molar Mass Poly(ε-caprolactone) by Means of Diphenyl Bismuth Ethoxide, a Highly Reactive Single Site Initiator by Kricheldorf, Hans R, Behnken, Gesa, Schwarz, Gert, Kopf, Juergen

“…Diphenylbismuth ethoxide, Ph2BiOEt, initiates the ring-opening polymerization of ε-caprolactone via a coordination-insertion mechanism. The matrix assisted…”
Get full text

Di-, Tri- and Tetrafunctional Poly(ε-caprolactone)s by Bi(OAc)3-Catalyzed Ring-Opening Polymerizations of ε-Caprolactone by Kricheldorf, Hans R, Hachmann-Thiessen, Heiko, Schwarz, Gert

“…ε-Caprolactone was polymerized in bulk at 150 °C with either tetra(ethylene glycol) (TEG), 1,1,1-tris(hydroxymethyl)propane, or Pentaerythritol as initiator…”
Get full text

Multicyclic Polyethers Derived from 1,4-Dicyanotetrafluorobenzene and Flexible Diphenols by Kricheldorf, Hans R, Schellenberg, Johann, Schwarz, Gert

“…1,4-Dicyanotetrafluorobenzene (DCTB) was polycondensed with various diphenols in DMF or DMSO using K2CO3 as catalyst and HF acceptor. At concentrations of 0.1…”
Get full text

Primary Amine-Initiated Polymerizations of α-Amino Acid N-Thiocarbonic Acid Anhydrosulfide by Kricheldorf, Hans R., Sell, Marc, Schwarz, Gert

“…The N-thiocarbonic acid anhydrosulfides NTAs of D,L-leucine, D,L-phenylalanine and sarcosine were polymerized in dioxane by addition of n-hexylamine as…”
Get full text

Multicyclic Polyethers of 5,5‘,6,6‘-Tetrahydroxy-3,3,3‘,3‘-Tetramethyl Spirobisindane and Di- or Triethyleneglycol. Multipotent Kryptands by Kricheldorf, Hans R, Lomadze, Nino, Schwarz, Gert

“…5,5‘-Tetrahydroxy-3,3,3‘,3‘-tetramethyl spirobisindane (TTSBI) was deprotonated with potassium tert-butoxide and polycondensed with di(ethylene glycol)…”
Get full text