Anionic polymerization of β‐lactones initiated with potassium hydride. A convenient route to polyester macromonomers

Kurcok, Piotr; Matuszowicz, Andrzej; Jedliński, Zbigniew

doi:10.1002/marc.1995.030160308

Cited by 27 publications

(34 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5, respectively). These results are in agreement with the fact the anionic polymerization of (R,S)-BL leads to low yield and chains of a relatively low molecular weight [27][28][29][30][31][32][33]. Figure 1 displays the GPC chromatograms of the obtained polymers.…”

Section: Results and Discussion 31 Synthesis Of The Copolymerssupporting

confidence: 86%

“…Among the initiators used in anionic polymerization of BL are the alkali metal hydrides, which give rise to polymers with low yield and low molecular weight [27]. However, to the best of our knowledge, there are no literature reports in which these have been used to start the copolymerization of BL and CL.…”

Section: Results and Discussion 31 Synthesis Of The Copolymersmentioning

confidence: 99%

“…It can be noted that the copolymers spectra show signals of both homopolymers. The resonances at δ = 1.8 ppm, δ = 5.8 ppm and δ = 6.8 ppm observed in the 1 H-NMR spectrum, can be attributed to the presence of a crotonyl end-group [32]; this group is formed at the initiation step of the polymerization where the α-proton abstraction of the (R,S)-BL could occur resulting in the salt of the unsaturated carboxylic acid as propagating species of reaction, as shown in Figure 3 [27,33]. To determine the comonomer sequencing (random or in block), the most convenient spectrum range is the corresponding to carbonyl carbon [10,13,41].…”

Section: Structural Analysis Of Copolymersmentioning

confidence: 98%

“…However, many are relatively toxic and impossible to remove completely from the synthesized material, this being undesirable for pharmaceutical or biomedical applications [2,6]. Therefore, several attempts to use a catalyst based on much less toxic metal compounds are being undertaken [2,6,11,[22][23][24][25][26][27]. The anionic polymerization of β-butyrolactone had been widely studied [27][28][29][30][31][32][33][34][35][36][37][38][39][40], and in general polymers with low molecular weight were obtained.…”

Section: Introductionmentioning

confidence: 99%

“…The anionic polymerization of β-butyrolactone had been widely studied [27][28][29][30][31][32][33][34][35][36][37][38][39][40], and in general polymers with low molecular weight were obtained. Relatively low toxic alkali metal hydrides are among the initiators used for this purpose [27], nevertheless, they have not been used so far for the synthesis of copolymers of (R,S)-BL and CL. It is for this reason that the possibility of utilizing sodium hydride as the initiator of the copolymerization of (R,S)-BL and CL is undertaken in this work.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Ring-opening copolymerization of (R,S)-β-butyrolactone and ε-caprolactone using sodium hydride as initiator

Monsalve¹,

Contreras²,

Laredo³

et al. 2010

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Copolymers of racemic β-butyrolactone ((R,S)-BL) and ε-caprolactone (CL), were synthesized by ring-opening polymerization initiated by sodium hydride (NaH). The initiator exhibited a satisfactory catalytic activity, producing copolymers whose yields are greatly influenced by the feed monomer ratio, CL/BL. All polymers obtained were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide angle X-rays scattering, WAXS. The molar composition of copolyesters determined by 1 H-NMR spectra, showed that the incorporation of CL is favoured over the incorporation of (R,S)-BL. Gel permeation chromatography and 13 C-NMR spectra indicated that CL/BL copolymers had block sequence distribution. The TGA analysis of copolymers showed that these copolymers are stable up to temperatures near 200°C, followed by a decomposition process in two steps; the first one is attributed to the (R,S)-BL block degradation and the second to the remaining PCL block. The crystallization process of these copolymers was studied by DSC and WAXS showing that the amorphous (R,S)-BL segments chains did not affect the crystallinity of the PCL blocks.

show abstract

Section: Results and Discussion 31 Synthesis Of The Copolymerssupporting

confidence: 86%

Section: Results and Discussion 31 Synthesis Of The Copolymersmentioning

confidence: 99%

Section: Structural Analysis Of Copolymersmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ring-opening copolymerization of (R,S)-β-butyrolactone and ε-caprolactone using sodium hydride as initiator

Monsalve¹,

Contreras²,

Laredo³

et al. 2010

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

Chemical Modification of Natural and Synthetic Polyesters

2002

View full text Add to dashboard Cite

Historical Outline and Introductory Remarks Malic Acid‐based Polyesters Poly(α‐Malic Acid) and its Copolymers Poly(β‐Malic Acid) and Poly(alkyl malolactonate)s Polyesters with Pendant Amine Groups Poly( l ‐Serine Ester)s Poly(lactic acid‐ co ‐lysine) Functionalization of Poly(ɛ‐caprolactone) Synthesis of Functional Monomers by the Bayer–Villiger Oxidation of Cyclohexanones Post‐modification of Functional PCL Functional Poly(ester amide)s Functional Polyesters by Miscellaneous Polymerization Methods Synthesis of Functional Polyesters by Michael‐type Reaction Synthesis of Functional Polyesters from Protected Polyhydroxylated Monomeric Precursors Telechelic Polyesters Role of Polymerization Mechanism Anionic ROP Coordinative ROP Functional Microbial Polyesters Concluding Remarks

show abstract

The use of the trellis‐6 thrombectomy device in the management of acute limb ischemia due to native vessel occlusion: Challenges, tips, and limitations

Daly

Patel

Prasad

2012

Cathet Cardio Intervent

View full text Add to dashboard Cite

The role of endovascular therapy is expanding in the treatment of acute limb ischemia (ALI). In addition to catheter-based thrombolysis, there are multiple devices which allow for clot disruption and aspiration. The Trellis catheter system provides mechanical agitation of thrombus coupled with chemical thrombolysis. We present two cases of native arterial occlusions in which the Trellis catheter was used for thrombolysis. Procedural tips and challenges associated with the use of this device in native vessels are discussed.

show abstract

Anionic polymerization of β‐lactones initiated with potassium hydride. A convenient route to polyester macromonomers

Cited by 27 publications

References 15 publications

Ring-opening copolymerization of (R,S)-β-butyrolactone and ε-caprolactone using sodium hydride as initiator

Ring-opening copolymerization of (R,S)-β-butyrolactone and ε-caprolactone using sodium hydride as initiator

Chemical Modification of Natural and Synthetic Polyesters

The use of the trellis‐6 thrombectomy device in the management of acute limb ischemia due to native vessel occlusion: Challenges, tips, and limitations

Contact Info

Product

Resources

About