Synthesis of high-impact biodegradable multiblock copolymers comprising of poly(butylene succinate) and poly(1,2-propylene succinate) with hexamethylene diisocyanate as chain extender

2011 ◽  
Vol 22 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Liuchun Zheng ◽  
Chuncheng Li ◽  
Weiguo Huang ◽  
Xi Huang ◽  
Dong Zhang ◽  
...  
Keyword(s):  
Chain Extender ◽  
High Impact ◽  
Hexamethylene Diisocyanate ◽  
Multiblock Copolymers ◽  
Butylene Succinate

Effect of chain extender on morphology and tensile properties of poly(l-lactic acid)/poly(butylene succinate-co-l-lactate) blends

2020 ◽  
pp. 101852
Author(s):  
Masakazu Nishida ◽  
Xiangyu Liu ◽  
Shun Furuya ◽  
Masahiro Nishida ◽  
Tetsuo Takayama ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Tensile Properties ◽  
Chain Extender ◽  
Butylene Succinate

scholarly journals Thermal stability of segmented polyurethane elastomers reinforced by clay particles

2009 ◽  
Vol 63 (6) ◽  
pp. 621-628 ◽  
Author(s):  
Jelena Pavlicevic ◽  
Jaroslava Budinski-Simendic ◽  
Mészáros Szécsényi ◽  
Nada Lazic ◽  
Milena Spirkova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Chain Extender ◽  
Hexamethylene Diisocyanate ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Polyurethane Elastomers ◽  
Oh Groups ◽  
Clay Nanoparticles ◽  
Thermal Stability Of

The aim of this work was to determine the influence of clay nanoparticles on thermal properties of segmented polyurethanes based on hexamethylene- diisocyanate, aliphatic polycarbonate diol and 1,4-butanediol as chain extender. The organically modified particles of montmorillonite and bentonite were used as reinforcing fillers. The structure of elastomeric materials was varied either by diol type or chain extender content. The ratio of OH groups from diol and chain extender (R) was either 1 or 10. Thermal properties of prepared materials were determined using modulated differential scanning calorimetry (MDSC). Thermal stability of obtained elastomers has been studied by simultaneously thermogravimetry coupled with DSC. The glass transition temperature, Tg, of soft segments for all investigated samples was about -33?C. On the basis of DTG results, it was concluded that obtained materials were very stable up to 300?C.

Comparison of memory effects in multiblock copolymers and covalently crosslinked multiphase polymer networks composed of the same types of oligoester segments and urethane linker

2013 ◽  
Vol 1569 ◽  
pp. 123-128
Author(s):  
Li Wang ◽  
Ulrich Nöchel ◽  
Marc Behl ◽  
Karl Kratz ◽  
Andreas Lendlein
Keyword(s):  
Shape Recovery ◽  
Polymer Networks ◽  
Memory Effects ◽  
Hexamethylene Diisocyanate ◽  
Multiblock Copolymers ◽  
Polymer Systems ◽  
Degradable Polymer ◽  
Temperature Memory Effect ◽  
Switching Temperature ◽  
Shape Fixity

ABSTRACTPhase-segregated multiblock copolymers (MBC) as well as covalently crosslinked multiphase polymer networks, which are composed of crystallizable oligo(ε-caprolactone) (OCL) and oligo(ω-pentadecalactone) (OPDL) segments have been recently introduced as degradable polymer systems exhibiting various memory effects. Both types of copolyesterurethane networks can be synthesized via co-condensation of the respective hydroxytelechelic oligomers and 2,2(4),4-trimethyl-hexamethylene diisocyanate (TMDI) as aliphatic linker.In this work the dual-shape properties as well as the temperature-memory capability of thermoplastics and covalently crosslinked copolyesterurethanes containing OCL and OPDL domains are explored. Both copolyesterurethane networks exhibited excellent dual-shape properties with high shape fixity ratios Rf ≥ 93% and shape recovery ratios in the range of 92% to 100% determined in the 2nd and 3rd test cycle, whereby the dual-shape performance was substantially improved when covalent crosslinks are present in the copolymer.A pronounced temperature-memory effect was achieved for thermoplastic as well as crosslinked copolyesterurethanes. Hereby, the switching temperature Tsw could be adjusted via the variation of the applied deformation temperature Tdeform in the range from 32 °C to 53 °C for MBC and in the range from 29 °C to 78 °C for multiphase polymer networks.

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