Synthesis, characterization and properties of novel biodegradable multiblock copolymers comprising poly(butylene succinate) and poly(1,2-propylene terephthalate) with hexamethylene diisocyanate as a chain extender

2010 ◽  
Vol 60 (4) ◽  
pp. 666-675 ◽  
Author(s):  
Liuchun Zheng ◽  
Chuncheng Li ◽  
Dong Zhang ◽  
Guohu Guan ◽  
Yaonan Xiao ◽  
...  
Keyword(s):  
Chain Extender ◽  
Hexamethylene Diisocyanate ◽  
Multiblock Copolymers ◽  
Butylene Succinate ◽  
A Chain

Synthesis and Characterizations of PLLA/PEG Block Copolymers

2010 ◽  
Vol 93-94 ◽  
pp. 198-201 ◽  
Author(s):  
Thai Hien Nguyen ◽  
Atitsa Petchsuk ◽  
Pramuan Tangboriboonrat ◽  
Mantana Opaprakasit ◽  
Alice Sharp ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Chemical Structure ◽  
Triblock Copolymers ◽  
Hexamethylene Diisocyanate ◽  
Chain Extension ◽  
Poly Lactic Acid ◽  
Multiblock Copolymers ◽  
Molar Ratios ◽  
A Chain

Poly(lactic acid-co-ethylene glycol) (PLLA/PEG) copolymers were synthesized and their properties were characterized. The PLLA/PEG/PLLA triblock copolymers were synthesized by ring-opening polymerization from l-lactide (LLA) and PEG macroinitiator. Stannous octoate, Sn(Oct)2 was used as a catalyst. Effects of molecular weight of PEG (600, 2000 and 4000), LLA/OH molar ratios (95:5, 98:2) and a sequence of addition of the reactants on properties of the copolymers were investigated. The triblock copolymers were subsequently used in a production of multiblock copolymers by reacting with a chain-extending agent, hexamethylene diisocyanate (HMDI). Chemical structure and molecular weight of the copolymers were characterized by 1H-NMR, FTIR and GPC. The results showed that molecular weight of triblock copolymers varied from 4,500 to 10,200. After chain extension, multiblock copolymer with molecular weight of 16,490 was produced. Thermal properties of the copolymers were also examined by DSC.

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.

The Preparation of Poly(lactic acid) via Chain Linked Hydroxy-Terminated Lactic Acid Prepolymer

2011 ◽  
Vol 410 ◽  
pp. 337-340
Author(s):  
Suek Songprateepkul ◽  
Suriyan Rakmae ◽  
C. Deeprasertkul ◽  
Nitinat Suppakarn ◽  
Pranee Chumsamrong
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Average Molecular Weight ◽  
Glass Tube ◽  
Acid Value ◽  
Chain Extender ◽  
Hexamethylene Diisocyanate ◽  
Poly Lactic Acid ◽  
Weight Average Molecular Weight ◽  
A Chain

In this work, hydroxyl-terminated lactic acid prepolymer was firstly prepared by adding diethylene glycol in the condensation of lactic acid. Molecular weight, acid value and structure of prepolymer were characterized. The results showed that the prepolymer was hydroxyl-terminated with weight average molecular weight (MW) of 10,000 g/mol. After that, the chain linking polymerization of the prepolymer was carried out in a glass tube at 160 °C for 1 h employing 1,6-hexamethylene diisocyanate (HMDI) as a chain extender. By varying the hydroxyl/isocyanate ratio, it was found that the OH/NCO ratio of 1:2 seemed to be the most suitable ratio which gave PLA with the maximum MW of 93,000 g/mol.

scholarly journals Polypropylene Glycol-Polyoxytetramethylene Glycol Multiblock Copolymers with High Molecular Weight: Synthesis, Characterization, and Silanization

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4317
Author(s):  
Wei Hu ◽  
Lei Wang ◽  
Quanyong Wang ◽  
Anbo Luan ◽  
Yuliang Mai ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Average Molecular Weight ◽  
Chain Extender ◽  
Chain Extension ◽  
Polypropylene Glycol ◽  
Multiblock Copolymers ◽  
Oh Groups ◽  
Potential Applications ◽  
A Chain

The high crystallization at room temperature and high cost of polyoxytetramethylene glycol (PTMG) have become obstacles to its application. To overcome these problems, a segment of PTMG can be incorporated into a block copolymer. In this work, polypropylene (PPO) glycol-polyoxytetramethylene (PPO-PTMG) multiblock copolymers were designed and synthesized through a chain extension between hydroxyl (OH)-terminated PPO and PTMG oligomers. The chain extenders, feed ratios of the catalyst/chain extender/OH groups, reaction temperature, and time were optimized several times to obtain a PPO-PTMG with low crystallization and high molecular weight. Multiblock copolymers with low crystallization and high average molecular weight (Mn = 1.0–1.4 × 104 Dalton) were harvested using m-phthaloyl chloride as the chain extender. The OH-terminated PPO-PTMG multiblock copolymer with high Mn and a functionality near two was further siliconized by 3-isocyanatopropyltrimethoxysilane to synthesize a novel silyl-terminated polyether. This polyether has an appropriate vulcanizing property and potential applications in sealants/adhesive fields.

scholarly journals Synthesis, Characterization, and Electrospinning of a Functionalizable, Polycaprolactone-Based Polyurethane for Soft Tissue Engineering

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1527
Author(s):  
Jin-Jia Hu ◽  
Chia-Chi Liu ◽  
Chih-Hsun Lin ◽  
Ho-Yi Tuan-Mu
Keyword(s):  
Tissue Engineering ◽  
Soft Tissue ◽  
Chain Extender ◽  
Hexamethylene Diisocyanate ◽  
Diameter Distribution ◽  
Elongation At Break ◽  
Initial Modulus ◽  
Ft Ir ◽  
Soft Tissue Engineering ◽  
A Chain

We synthesized a biodegradable, elastomeric, and functionalizable polyurethane (PU) that can be electrospun for use as a scaffold in soft tissue engineering. The PU was synthesized from polycaprolactone diol, hexamethylene diisocyanate, and dimethylolpropionic acid (DMPA) chain extender using two-step polymerization and designated as PU-DMPA. A control PU using 1,4-butanediol (1,4-BDO) as a chain extender was synthesized similarly and designated as PU-BDO. The chemical structure of the two PUs was verified by FT-IR and 1H-NMR. The PU-DMPA had a lower molecular weight than the PU-BDO (~16,700 Da vs. ~78,600 Da). The melting enthalpy of the PU-DMPA was greater than that of the PU-BDO. Both the PUs exhibited elastomeric behaviors with a comparable elongation at break (λ=L/L0= 13.2). The PU-DMPA had a higher initial modulus (19.8 MPa vs. 8.7 MPa) and a lower linear modulus (0.7 MPa vs. 1.2 MPa) and ultimate strength (9.5 MPa vs. 13.8 MPa) than the PU-BDO. The PU-DMPA had better hydrophilicity than the PU-BDO. Both the PUs displayed no cytotoxicity, although the adhesion of human umbilical artery smooth muscle cells on the PU-DMPA surface was better. Bead free electrospun PU-DMPA membranes with a narrow fiber diameter distribution were successfully fabricated. As a demonstration of its functionalizability, gelatin was conjugated to the electrospun PU-DMPA membrane using carbodiimide chemistry. Moreover, hyaluronic acid was immobilized on the amino-functionalized PU-DMPA. In conclusion, the PU-DMPA has the potential to be used as a scaffold material for soft tissue engineering.

Effect of a chain extender on the properties of poly(lactic acid)/zinc oxide/copper chlorophyll acid antibacterial nanocomposites

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Weihua Fan ◽  
Yue Zhao ◽  
Aijing Zhang ◽  
Yukun Liu ◽  
Yanxia Cao ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Lactic Acid ◽  
Chain Extender ◽  
Poly Lactic Acid ◽  
A Chain

scholarly journals Synthesis and Properties of Waterborne Polyurethane (WBPU)/Modified Lignin Amine (MLA) Adhesive: A Promising Adhesive Material

2016 ◽  
Author(s):  
Mohammad Mizanur Rahman ◽  
Md. Hasan Zahir ◽  
Han Do Kim
Keyword(s):  
Adhesive Strength ◽  
Weather Conditions ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Mixing Process ◽  
Adhesive Material ◽  
Lignin Amine ◽  
A Chain ◽  
Modified Lignin ◽  
Adhesive Materials

A series of waterborne polyurethane (WBPU)/modified lignin amine (MLA) adhesives was prepared using modified lignin amine (MLA) as a chain extender by a prepolymer mixing process. A successful Mannich reaction was achieved during the synthesis of MLA by reacting lignin with bis(3-aminopropyl)amine. Higher tensile strength, Young’s modulus and thermal stability were recorded for WBPU/MLA adhesives with higher MLA contents. The WBPU/MLA adhesive materials were used to coat PVC substrates. The adhesive strength increased with increasing MLA content. More importantly, the MLA also enhanced the WBPU/MLA coating in terms of adhesive strength at moderately high temperatures as well as under natural weather exposed conditions. The adhesive strength was essentially unaffected with 6.48 mole% MLA in the WBPU/MLA coating after exposure to natural weather conditions for 180 days.

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