PLA-PEG-PLA tri-block copolymers: Effective compatibilizers for promotion of the interfacial structure and mechanical properties of PLA/PBAT blends

Ding, Yue; Feng, Wutong; Lü, Bo; Wang, Pingli; Wang, Gexia; Ji, Junhui

doi:10.1016/j.polymer.2018.05.037

Cited by 79 publications

(57 citation statements)

References 45 publications

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“…Melt blending or compounding PLLA with different types of flexible polymers was one of the economic approaches to toughen PLLA . However, poly(ε‐caprolactone) (PCL) was a biodegradable aliphatic polyester with high flexibility and good biocompatibility and thermal stability, which had gained great attention as modifiers for PLLA, and the modifying results exhibited some improvements in the toughness of PLLA .…”

Section: Introductionmentioning

confidence: 99%

Toughening modification of PLLA with PCL in the presence of PCL‐b‐PLLA diblock copolymers as compatibilizer

Xiang

Feng

Bian

et al. 2019

Polymers for Advanced Techs

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To obtain an effective compatibilizer for the blends of poly(L‐lactide) (PLLA) and poly(ε‐caprolactone) (PCL), the diblock copolymers PCL‐b‐PLLA with different ratios of PCL/PLLA (CL/LA) and different molecular weights (Mn) were synthesized by ring‐opening polymerization (ROP) of L‐lactide with monohydric poly(ε‐caprolactone) (PCL‐OH) as a macro‐initiator. These copolymers were melt blended with PLLA/PCL (80/20) blend at contents between 3.0 and 20 phr (parts per hundred resin), and the effects of added PCL‐b‐PLLA on the mechanical, morphological, rheological, and thermodynamic properties of the PLLA/PCL/PCL‐b‐PLLA blends were investigated. The compatibility between PLLA matrix and PCL phase was enhanced with decreasing in CL/LA ratios or increasing in Mn for the added PCL‐b‐PLLA. Moreover, the crystallinity of PLLA matrix increased because of the added compatibilizers. The PCL‐b‐PLLA with the ratio of CL/LA (50/50) and Mn ≥ 39.0 kg/mol were effective compatibilizers for PLLA/PCL blends. When the content of PCL‐b‐PLLA is greater than or equal to 5 phr, the elongations at break of the PLLA/PCL/PCL‐b‐PLLA blends all reached approximately 180%, about 25 times more than the pristine PLLA/PCL(80/20) blend.

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Section: Introductionmentioning

confidence: 99%

Toughening modification of PLLA with PCL in the presence of PCL‐b‐PLLA diblock copolymers as compatibilizer

Xiang

Feng

Bian

et al. 2019

Polymers for Advanced Techs

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“…The T g (MPBAT) of MSPT composites containing the PUP compatibilizer shifted toward a higher temperature compared with that of control (−21.53 °C) . A possible explanation was that PUP enhanced the interfacial adhesion between starch and MPBAT due to the physical crosslinking of polyethylene glycol adipate in PUP and poly‐1, 4‐butylene glycol adipate in MPBAT, as well as the chemical crosslinking of the PUP and starch. The T g (MPBAT) and Δ T g went through a maximum at the MSPT‐2 samples with increasing PUP addition.…”

Section: Resultsmentioning

confidence: 96%

Polyurethane Prepolymer Modified Cassava Starch Based Poly(butylene adipate‐co‐terephthalate) Composites with Excellent Compatibility and High Toughness

et al. 2019

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In this study, a high‐efficiency polyurethane prepolymer (PUP) compatibilizer is developed to improve the compatibility between cassava starch and poly(butylene adipate‐co‐terephthalate) with higher molecular weight (MPBAT). Preferentially, modified starch (MS) is prepared by reacting isocyanate groups of PUP with hydroxyl groups of starch in a high‐speed mixer, and then starch‐based MPBAT composites (MSPT) with PUP as a compatibilizer are continuously extruded using twin‐screw extruder. The mechanical properties, water absorption, and thermodynamic properties as well as morphology of MSPT are investigated with different PUP contents and at the same mass ratio of MPBAT to starch (1:1). Samples of MSPT‐2 provide satisfactory mechanical properties comparable to control samples. Addition of 13 wt.% PUP to MSPT, improves tensile strength from 3.8 to 11.9 MPa and increases elongation at break from 93.3 to 580.4% at room temperature compared with control without the PUP. The hydrophobicity and thermostability properties of MSPT‐2 composites are also enhanced. The results further prove that MSPT‐2 composites possess excellent compatibility, not only because of the urethane bonds of the PUP and starch, but also stemming from the physical crosslinking between soft segment of PUP and aliphatic segment of MPBAT. Starch‐based MPBAT composites with excellent compatibility and high toughness will help broaden the application field of biodegradable plastics.

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“…The brittleness does hinder its applications ranging from packaging materials to medical implants . To improve the elongation at break and impact strength, various modifier polymers (e.g., rubber or other polymers with excellent flexibility) have been widely employed to blend with PLLA . The binary blend, however, always undergoes phase separation because of weak interfacial interaction and poor miscibility between PLLA and other polymers.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, compatibilizers have been introduced to the blend system . For instance, Ding and his co‐workers synthesized a polylactic‐polyethylene glycol‐polylactic (PLA‐PEG‐PLA) tri‐block copolymer to improve compatibility between polylactic acid (PLA) and poly(butylene adipate‐co‐terephthalate) (PBAT) . The results indicated that typical sea‐island structures changed to co‐continuous structures.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

Zhang

et al. 2019

Macro Materials & Eng

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Poly(L‐lactic acid) (PLLA) with high ductility and transparence is fabricated by a blending tiny amount of polyvinylidene fluoride (PVDF) and reactive comb compatibilizers (RCC). Upon blending, the reaction between terminal carboxyl groups in PLLA and expoxy groups in RCC produces graft copolymer (PLLA‐g‐poly(methyl methacrylate) (PMMA)), which locates at the PVDF/PLLA interface due to the balanced stress on two sides. On the one hand, the PVDF domain size decreases remarkably with the help of compatibilization, accounting for the excellent transparence. On the other hand, the interface is enhanced significantly, resulting in an activated PLLA layer surrounding PVDF domains. The thickness exhibits higher magnitude because of the high molecular weight of grafted PLLA (relative to premade compatibilizers). During uniaxial tension, the activated PLLA layers (in addition to PVDF) can cause effective energy absorption and dissipation in the case of percolation of them, which is the reason for the better ductility. These results provide an efficient strategy to improve the ductility and transparence simultaneously.

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PLA-PEG-PLA tri-block copolymers: Effective compatibilizers for promotion of the interfacial structure and mechanical properties of PLA/PBAT blends

Cited by 79 publications

References 45 publications

Toughening modification of PLLA with PCL in the presence of PCL‐b‐PLLA diblock copolymers as compatibilizer

Toughening modification of PLLA with PCL in the presence of PCL‐b‐PLLA diblock copolymers as compatibilizer

Polyurethane Prepolymer Modified Cassava Starch Based Poly(butylene adipate‐co‐terephthalate) Composites with Excellent Compatibility and High Toughness

Fabrication of PLLA with High Ductility and Transparence by Blending with Tiny Amount of PVDF and Compatibilizers

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