scholarly journals Preparation of Stereocomplex Polylactide/Poly(Butylene Succinate) Blends by Melt Blending

2019 ◽  
Vol 35 (3) ◽  
pp. 958-965 ◽  
Author(s):  
Jenjira Jirum ◽  
Yodthong Baimark
Keyword(s):  
Amorphous Region ◽  
Chain Extender ◽  
Chain Extension ◽  
Melt Blending ◽  
Butylene Succinate ◽  
Blend Films ◽  
Thermal Phase ◽  
A Chain ◽  
Phase Compatibility ◽  
Thermal Stability Of

Biodegradable polymer blends based on stereocomplex polylactide (scPLA) and poly(butylene succinate) (PBS) were successfully formed by continuous two-step melt blending. An epoxy-based, multifunctional chain extender was chosen to enhance phase compatibility of the blends. Effects of PBS and chain extender on thermal, phase morphology, thermo-mechanical and tensile properties of the scPLA/PBS blends were determined. The PBS blending enhanced plasticizing effect and cold-crystallization of scPLA matrix in an amorphous region. The chain-extension reaction inhibited crystallization of PBS, PLA homo-crystallites and PLA stereocomplex-crystallites as well as reduced thermal stability of the scPLA/PBS blends because of formation of long-chain branched structures. It has been shown that the poor phase compatibility between continuous scPLA and dispersed PBS phases of the blends may be solved through melt blending with a chain extender. The chain extension of scPLA/PBS blends also improved thermo-mechanical properties and flexibility of the scPLA/PBS blend films.

scholarly journals Improvement in Crystallizability and Melt Flow Property of Linear Poly(L-lactide) Bioplastic by Blending with Star-shaped Poly(L-lactide)

2018 ◽  
Vol 34 (4) ◽  
pp. 1878-1883 ◽  
Author(s):  
Yodthong Baimar ◽  
Yaowalak Srisuwan
Keyword(s):  
Flow Property ◽  
Nucleating Agent ◽  
Chain Extender ◽  
Chain Extension ◽  
Melt Blending ◽  
Melt Flow ◽  
Blend Ratio ◽  
Melt Strength ◽  
Blend Films ◽  
Linear Poly

This research focuses on the crystallizability and melt flow property of linear poly(L-lactide) (1-PLL) by blending with star-shaped 16-arm PLL (16-PLL). The 1-PLL/16-PLL blends were chain extended during melt blending using an epoxy-based chain extender. The crystallinities of the 1-PLL/16-PLL blends increased with the 16-PLL blend ratio and chain extension reaction. The 16-PLL enhanced formation of branched PLL during chain extension was confirmed by thermogravimetry, and improved the melt flow property of the blends. Stresses at break of the compressed blend films were improved slightly by the 16-PLL blending and chain extension. In conclusion, the 16-PLL could be used as a nucleating agent and a melt strength enhancer for linear PLL.

scholarly journals Toughening of Poly(L-lactide) with Blends of Poly(ε-caprolactone-co-L-lactide) in the Presence of Chain Extender

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Yaowalak Srisuwan ◽  
Yodthong Baimark ◽  
Supakij Suttiruengwong
Keyword(s):  
Impact Strength ◽  
Melt Flow Index ◽  
Chain Extender ◽  
Chain Extension ◽  
Flow Index ◽  
Melt Blending ◽  
Melt Flow ◽  
Phase Compatibility ◽  
The Impact ◽  
Reactive Melt

A poly(ε-caprolactone-co-L-lactide) copolyester was synthesized and employed to toughen poly(L-lactide) (PLLA) by reactive melt blending in the presence of an epoxy-based chain extender. The effects of chain extension reaction and copolyester content on properties of PLLA-based blends were studied. The chain extension reaction reduced crystallinity and melt flow index of PLLA/copolyester blends. Meanwhile the copolyester blending improved the crystallinities of the chain-extended PLLA up to 20 wt% copolyester. The phase compatibility between PLLA matrix and dispersed copolyester phases was enhanced by the chain extension reaction. The impact strength of chain-extended PLLA increased with the contents of copolyester and chain extender.

scholarly journals Fabrication and Characterization of Biodegradable Composites from Poly (Butylene Succinate-Co-Butylene Adipate) and Taihu Lake Blue Algae

2017 ◽  
Vol 26 (5) ◽  
pp. 096369351702600 ◽  
Author(s):  
Wenjing Xia ◽  
Nianqing Zhu ◽  
Zhongbin Ni ◽  
Mingqing Chen
Keyword(s):  
Tensile Strength ◽  
Taihu Lake ◽  
Mechanical Performance ◽  
Value Added ◽  
Melt Blending ◽  
Butylene Succinate ◽  
Elongation At Break ◽  
Biodegradable Composites ◽  
Thermal Stability Of

Biodegradable composites from poly (butylene succinate-co-butylene adipate) (PBSA) and Taihu Lake (Wuxi, China) blue algae were prepared by melt blending. The property and structure of biocomposites were investigated. By adding extra amount of water to blue algae, the formulated blue algae acted as a plastic in the composites during blending, and exhibited a reinforcing effect on the PBSA matrix. With increasing blue algae content, the thermal stability of the composites decreased; the tensile strength at break and elongation at break of the composites reduced, but the Young's modulus of the composites increased. However, the composite with 30% blue algae loading still exhibited good mechanical performance (tensile strength at break of 21.3 MPa, elongation at break of 180%). The fabrication of value-added PBSA/algae composites appeared as an effective approach to reduce the secondary environmental pollution of Taihu blue algae.

Application of bis(glycidyloxy)phenylphosphine oxide as a chain extender for polyamide-6

RSC Advances ◽  
2015 ◽  
Vol 5 (40) ◽  
pp. 31878-31885 ◽  
Author(s):  
Alvianto Wirasaputra ◽  
Jianqing Zhao ◽  
Yaming Zhu ◽  
Shumei Liu ◽  
Yanchao Yuan
Keyword(s):  
Mechanical Properties ◽  
Small Molecule ◽  
Polyamide 6 ◽  
Chain Extender ◽  
Chain Extension ◽  
A Chain ◽  
Phenylphosphine Oxide

Figure melt torque of PA6 mixed with different contents of chain extender BGPPO. The addition of small molecule diepoxide (BGPPO) greatly enhanced the melt torque, rheological and mechanical properties of polyamide-6 through chain extension reaction.

scholarly journals Influence of Chain-Extension Reaction on Stereocomplexation, Mechanical Properties and Heat Resistance of Compressed Stereocomplex-Polylactide Bioplastic Films

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1218 ◽  
Author(s):  
Yodthong Baimark ◽  
Sumet Kittipoom
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Heat Resistance ◽  
Tensile Testing ◽  
Chain Extender ◽  
Chain Extension ◽  
Melt Blending ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrd Patterns

Stereocomplex polylactide (scPLA) films were prepared by melt blending of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) with and without an epoxy-based chain extender before compression molding. The obtained scPLA films were characterized through differential scanning calorimetry, X-ray diffractometry (XRD), tensile testing and dimensional stability to heat. XRD patterns revealed that all the scPLA films had only stereocomplex crystallites. The obtained results showed that the chain-extension reaction improved mechanical properties of the scPLA films, however, it suppressed stereocomplexation and heat resistance.

Thermal and mechanical properties of highly flexible poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide) bioplastics: Effects of poly(ethylene glycol) block length and chain extender

2019 ◽  
Vol 52 (2) ◽  
pp. 142-158 ◽  
Author(s):  
Yodthong Baimark ◽  
Yaowalak Srisuwan
Keyword(s):  
Ethylene Glycol ◽  
Chain Extender ◽  
Chain Extension ◽  
Block Length ◽  
Melt Blending ◽  
Poly Ethylene Glycol ◽  
Lower Stress ◽  
Practical Applications ◽  
Poly Ethylene ◽  
Reactive Melt

The brittleness of poly(L-lactide) (PLLA) bioplastic is the main disadvantage for practical applications. Herein, we report the synthesis of high-molecular-weight PLLA- b-poly(ethylene glycol)- b-PLLA (PLLA-PEG-PLLA) block copolymers by ring-opening polymerization of LLA. The highly flexible PLLA-PEG-PLLAs were prepared by reactive melt blending with an epoxy-based chain extender formed as long-chain branched structures. The effects of PEG block length and content of chain extender were investigated. The results showed that the chain extension reaction reduced crystallinities of the PLLA-PEG-PLLAs. All the chain-extended PLLA-PEG-PLLA films had no phase separation. The lower crystallinities of PLLA-PEG-PLLA films obtained with higher contents of chain extender enhanced the film drawability. The longer PEG block length resulted in higher strain at break and lower stress at the break of PLLA-PEG-PLLA films. These chain-extended PLLA-PEG-PLLAs have potential for use as highly flexible bioplastics.

Studies on chain extension of a novel bio-based engineering elastomer using 4,4-diphenyl methane diisocyanate as a chain extender

2014 ◽  
Vol 131 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Lei Jiang ◽  
Hailan Kang ◽  
Zhao Wang ◽  
Liqun Zhang ◽  
Lixin Mao ◽  
...  
Keyword(s):  
Chain Extender ◽  
Chain Extension ◽  
A Chain

Preparation of waterborne elastic polyesters by chain extension with isophorone diisocyanate as a chain extender

2019 ◽  
Vol 137 (10) ◽  
pp. 48453 ◽  
Author(s):  
Yanping Zheng ◽  
Puxin Zhu ◽  
Fei Cheng ◽  
Mi Zhou ◽  
Kang Zhang ◽  
...  
Keyword(s):  
Chain Extender ◽  
Chain Extension ◽  
Isophorone Diisocyanate ◽  
A Chain
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