PLA architectures: the role of branching

Corneillie, Stijn; Smet, Mario

doi:10.1039/c4py01572j

Cited by 133 publications

(91 citation statements)

References 128 publications

(80 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…16 To achieve satisfactory composite manufacturing, the resin viscosity must be below 0.5 Pa s . It is believed that changing the architecture of the oligomers from linear to star‐shaped reduces the viscosity of the resins due to the coiling character and the smaller hydrodynamic volume of the polymers …”

Section: Resultsmentioning

confidence: 99%

Effect of lactic acid chain length on thermomechanical properties of star‐LA‐xylitol resins and jute reinforced biocomposites

Jahandideh

Esmaeili

Muthukumarappan

2017

Polymer International

View full text Add to dashboard Cite

Star‐shaped bio‐based resins were synthesized by direct condensation of lactic acid (LA) with xylitol followed by end‐functionalizing of branches by methacrylic anhydride with three different LA chain lengths (3, 5 and 7). The thermomechanical and structural properties of the resins were characterized by 13C NMR, Fourier transform IR spectroscopy, rheometry, DSC, dynamic mechanical analysis (DMA), TGA and flexural and tensile tests. An evaluation of the effect of chain length on the synthesized resins showed that the resin with five LAs exhibited the most favorable thermomechanical properties. Also, the resin's glass transition temperature (103 °C) was substantially higher than that of the thermoplast PLA (ca 55 °C). The resin had low viscosity at its processing temperature (80 °C). The compatibility of the resin with natural fibers was investigated for biocomposite manufacturing. Finally, composites were produced from the n5‐resin (80 wt% fiber content) using jute fiber. The thermomechanical and morphological properties of the biocomposites were compared with jute‐PLA composites and a hybrid composite made of the impregnated jute fibers with n5 resin and PLA. SEM and DMA showed that the n5‐jute composites had better mechanical properties than the other composites produced. Inexpensive monomers, good thermomechanical properties and good processability of the n5 resin make the resin comparable with commercial unsaturated polyester resins. © 2017 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of lactic acid chain length on thermomechanical properties of star‐LA‐xylitol resins and jute reinforced biocomposites

Jahandideh

Esmaeili

Muthukumarappan

2017

Polymer International

View full text Add to dashboard Cite

show abstract

“…They are also described in several reviews but only a few present selected branched polyesters synthesized by ring-opening polymerization (ROP) [26,27]. A significant part of the material presented in reviews on hyperbranched polymers [28][29][30][31][32][33] and aliphatic polyesters [14,34,35], where some chapters are devoted to branched polyesters, covers polyesters obtained by polycondensation processes…”

Section: Page 6 Of 75mentioning

confidence: 98%

“…One of the problems is excessive crystallinity, mainly for poly(Llactide) [14,26], which governs the degradability/hydrolyzability of polyesters. By copolymerizing L-LA with meso-lactide or other monomers like glycolide or ε-caprolactone leading to linear copolymers, the degree of crystallinity can be lowered.…”

Section: Influence Of Branched Structure On Polyester Propertiesmentioning

confidence: 99%

Branched aliphatic polyesters by ring-opening (co)polymerization

Bednarek

2016

Progress in Polymer Science

View full text Add to dashboard Cite

“…As well as we known, the architecture also influenced the properties of polymer, such as star-shaped structure [29,30]. Star-shaped polymers often had lower melt viscosities, different thermal and mechanical properties, and improved physical processing.…”

Section: Introductionmentioning

confidence: 98%

Preparation of high toughness and high transparency polylactide blends resin based on multiarmed polycaprolactone-block-poly(l-lactide)

et al. 2016

View full text Add to dashboard Cite

Modification of poly(L-lactide) (PLLA) via blending with two or more polymers is one of the effective approaches used to overcome the brittleness of PLLA, which often requires the addition of a compatibilizer and generate opaque materials. To solve this problem, multiarmed polycaprolactone-block-PLLA (PCL-b-PLLA) was synthesized by consecutive ring-opening polymerization of e-caprolactone and L-lactide using multihydroxyl alcohols as initiator. The structure and composition was confirmed by proton nuclear magnetic resonance and gel permeation chromatography. PLLA/multiarmed PCL-b-PLLA blends with various blend ratios were prepared via melt mixing. The presence of multiarmed PCL-b-PLLA (30%) in the PLLA matrix exhibited more than 80 times improvement in the elongation at break, as compared to unmodified PLLA. The addition of multiarmed PCL-b-PLLA in the PLLA contributed to the enhancement of the storage modulus in the low frequency, which was related to the entanglement of the PLLA and multiarmed PCL-b-PLLA. The blend interface had no obvious phase separation, and showed good adhesion between dispersed block copolymer phases within the continuous PLLA phase. The compatibilization mechanism and toughing mechanism were proposed. The resulting PLLA blends also showed good transparency. The current research opened a new route available to prepare transparent PLA-based resin with enhanced properties.

show abstract

PLA architectures: the role of branching

Abstract: Biobased and biodegradable polymers have become more and more interesting in view of waste management and crude oil depletion.

Cited by 133 publications

References 128 publications

Effect of lactic acid chain length on thermomechanical properties of star‐LA‐xylitol resins and jute reinforced biocomposites

Effect of lactic acid chain length on thermomechanical properties of star‐LA‐xylitol resins and jute reinforced biocomposites

Branched aliphatic polyesters by ring-opening (co)polymerization

Preparation of high toughness and high transparency polylactide blends resin based on multiarmed polycaprolactone-block-poly(l-lactide)

Contact Info

Product

Resources

About