Fast Microwave-Mediated Bulk Polycondensation ofd,l-Lactic Acid

Kéki, Sándor; Bodnár, Ildikó; Borda, J M; Deák, György; Zsuga, Miklós

doi:10.1002/1521-3927(20010901)22:13<1063::aid-marc1063>3.0.co;2-3

Cited by 50 publications

(28 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Reaction time was significantly shortened comparing to 24 h of conventional heating at 100°C and molecular masses were found to increase with irradiation time, while yields followed an opposite trend; after 20 min. cyclic oligomers were also formed, affecting the physical properties of the product (Keki et al, 2001). …”

Section: Scheme 1 Synthesis Of Poly(butylene Succinate) (Pbs)mentioning

confidence: 99%

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Frediani¹,

Giachi²,

Rosi³

et al. 2011

Microwave Heating

View full text Add to dashboard Cite

Section: Scheme 1 Synthesis Of Poly(butylene Succinate) (Pbs)mentioning

confidence: 99%

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Frediani¹,

Giachi²,

Rosi³

et al. 2011

Microwave Heating

View full text Add to dashboard Cite

“…[4,5] Some polymerization reactions are also significantly improved by microwave energy and the microwave-assisted preparations of biodegradable polymers have been studied. [6][7][8][9][10][11][12][13] Liao and co-workers investigated the microwave-assisted ROP (MROP) of e-caprolactone and revealed that poly(e-caprolactone) with a M w of around 120 000 g Á mol À1 was obtained by a 30 min microwave irradiation with 0.1% (mol/mol) stannous octoate (Sn(Oct) 2 ) as catalyst, but by a 270 min microwave irradiation with 1% (wt/wt) zinc powder. [14,15] The lactide molecule contains two polar carbonyl groups that lead to dielectric heating by absorbing microwaves, and the ROP of D,L-lactide (DLLA) was performed under microwave irradiation in our preliminary investigation.…”

Section: Introductionmentioning

confidence: 99%

Rapid Ring‐Opening Polymerization of D,L‐Lactide by Microwaves

Zhang

Liao

Liu

2004

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Summary: Poly(D,L‐lactide) with a molar mass of 105 g · mol−1 and a yield over 90% was produced in 10 min by the ring‐opening polymerization of D,L‐lactide under microwave irradiation with forward power of 255 W. A degradation of the poly(D,L‐lactide) was also induced by microwaves with a power level over 340 W. The molar mass of poly(D,L‐lactide) was dependent upon the competition between the polymerization of D,L‐lactide and the degradation of the resulting polymer.Profiles of molar mass versus microwave irradiation time (1.8 g DLLA, 0.1% Sn(Oct)2).magnified imageProfiles of molar mass versus microwave irradiation time (1.8 g DLLA, 0.1% Sn(Oct)2).

show abstract

“…[53] indicate that prolonged microwave irradiation might lead to high temperature development during the reaction progress and, as a consequence, cyclic oligomer production.…”

Section: Thermal Degradationmentioning

confidence: 99%

A concise review on microwave-assisted polycondensation reactions and curing of polycondensation polymers with focus on the effect of process conditions

Komorowska-Durka

Dimitrakis

Bogdał

et al. 2015

Chemical Engineering Journal

View full text Add to dashboard Cite

The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractDuring the past 15 years, increasing application of microwave heating to polycondensation reactions has been witnessed. Experiments have been carried out at laboratory scale using widely different experimental procedures. The use of microwaves has often led to significant benefits compared to conventional heating experiments in terms of multi-fold decrease in reaction times and energy consumption and production of polymers with increased molecular weight and improved mechanical properties. In other cases, microwaves do not appear to 2 produce any significant benefits compared to conventional heating. At present, guidelines to experimentalist as to the process conditions and experimental design that should be applied are missing and experimentation seems to be based on an empirical trial-and-error approach.In view of the very different experimental protocols that have been applied and the contradictory trends that are frequently reported, we aim in this review to shed light on the role of important process parameters, such as the presence and type of solvent, the dielectric properties of the mixture and the individual phases, the use of heterogeneous catalysts, pressure, stirring, reflux conditions, temperature measurement method and microwave absorbing fillers, which all seem to determine the occurrence and magnitude of the benefits enabled by microwaves during polycondensation reactions.

show abstract

Fast Microwave-Mediated Bulk Polycondensation ofd,l-Lactic Acid

Cited by 50 publications

References 7 publications

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Synthesis and processing of biodegradable and bio-based polymers by microwave irradiation

Rapid Ring‐Opening Polymerization of D,L‐Lactide by Microwaves

A concise review on microwave-assisted polycondensation reactions and curing of polycondensation polymers with focus on the effect of process conditions

Contact Info

Product

Resources

About