Synthesis and characterization of (AB)n-type poly(l-lactide)–poly(dimethyl siloxane) multiblock copolymer and the effect of its macrodiol composition on urethane formation

Ho, Chang‐Hong; Wang, Chau-Hui; Lin, Chia-Wei; Lee, Yu‐Der

doi:10.1016/j.eurpolymj.2009.04.024

Cited by 18 publications

(7 citation statements)

References 42 publications

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“… a See the Experimental Section in the Supporting Information for details. b Volume fractions of PLLA hard block calculated from densities of PLLA (1.290 g cm –1 ) and PDP (0.991 ± 0.017 g cm –1 ) at 25 °C and reported in ref . c T ODT and G ′ values at 25 °C determined by dynamic mechanical analysis (DMA) with rectangular torsion fixture. Oscillation test from −70 °C to 145 °C at 3 °C min –1 , ω = 1.00 rad s –1 , and γ = 1.0%. d Calculated using the Guth–Smallwood applied by Holden for block copolymers with spherical glassy domains: G = ρ RT (1 + 2.5 V + 14.1 V 2 )/ M e , where V is the hard-phase volume fraction, ρ the density of the rubbery phase, R the universal gas constant, T the temperature, and G the plateau storage modulus, the approximated entanglement molar mass ( M e ) for PDP in (PLLA–PDP–PLLA) n . e Mechanical properties determined on an ASTM D1708 with microtensile bars and reported in refs − and ref . f Data taken from ref . (LDL) 4.9–6.0 represents (poly( l -lactide)–poly(ε-decalactone)–poly( l -lactide)) 4.9–6.0 having ( M n ) MR = 66–110 kg mol –1 . g Tensile stress at 100% strain. h Data taken from ref .…”

Section: Resultsmentioning

confidence: 99%

“…(LE/E E L) 3.6 represents (poly( l -lactide)–poly(ethylene- co -ethylethylene)–poly( l -lactide)) 3.6 having ( M n ) NMR = 38 kg mol –1 and σ y (yield stress) = 27.7 MPa. i Data taken from ref . (LBL) 1.7–3.9 represents (poly( l -lactide)–poly(butadiene)–poly( l -lactide)) 1.7–3.9 having ( M n ) NMR = 41–77 kg mol –1 and σ y (yield stress) = 11.4–37.2 MPa. j Datat taken from ref . (LDMSL) 5.2–6.8 represents (poly( l -lactide)–poly(dimethylsiloxane)–poly( l -lactide)) 5.2–6.8 having ( M n ) GPC (PS) = 95–99 kg mol –1 and σ y (yield stress) = 3.0–6.0 MPa. k LLA composition defined as weight composition ( w PLLA ). l These values were estimated from reference plots …”

Section: Resultsmentioning

confidence: 99%

“… e Mechanical properties determined on an ASTM D1708 with microtensile bars and reported in refs − and ref . …”

Section: Resultsmentioning

confidence: 99%

“… j Datat taken from ref . (LDMSL) 5.2–6.8 represents (poly( l -lactide)–poly(dimethylsiloxane)–poly( l -lactide)) 5.2–6.8 having ( M n ) GPC (PS) = 95–99 kg mol –1 and σ y (yield stress) = 3.0–6.0 MPa. …”

Section: Resultsmentioning

confidence: 99%

“…Notably, there was nonuniform plastic deformation (necking) before breaking in the S–S curves (Figure ), because it is likely that PLLA domains connected by PDP bridges in one (LDPL) n multiblock chain gradually became untied as the strain increased . The Young’s moduli and ultimate tensile properties were also compared to those of the previously reported PLLA or PLA-segmented multiblock thermoplastic polyurethanes for elastomers and plastics, as shown in Table . ,, …”

Section: Resultsmentioning

confidence: 99%

See 4 more Smart Citations

Multiblock Thermoplastic Elastomers Derived from Biodiesel, Poly(propylene glycol), and l-Lactide

Lee

Yuk

Park

et al. 2017

ACS Sustainable Chem. Eng.

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A series of [poly(l-lactide)–poly(dimer acid methyl ester-alt-poly(propylene glycol))–poly(l-lactide)] n (PLLA–PDP–PLLA) n multiblock copolymers was synthesized in a three-step procedure: PLLA–PDP–PLLA (LDPL) triblock copolymers were synthesized using ring-opening polymerization of l-lactide with PDP macroinitiators, which was prepared via step-growth melt polycondensation based on biodiesel and macro-diol, followed by chain extension of the LDPL triblock with 4,4′-methylenebis(phenyl isocyanate). Molecular characterization revealed that the synthetic procedures yielded the desired triblock and multiblock copolymers (f PLLA = 0.22–0.27). The relationship between thermal behavior and morphology indicated microphase separation into two domains in both the triblocks and multiblocks. Compared to previously reported triblocks with a high molar mass and PLLA hard blocks with inaccessible order–disorder transition temperature (T ODT) values, the multiblock architectures in this study were found to become disordered at much lower temperatures (T ODT = 82–128 °C). To prepare (LDPL) n multiblocks, coupling low-molar-mass LDPL triblocks without free-standing thin films led to dramatically enhanced tensile properties. The self-adhesive performance of the pressure-sensitive adhesive (PSA) system including the multiblocks was evaluated, showing a peel strength of 3.1 N cm–1, a probe tack of 1.9 N, and static shear strength of >50 000 min, which are values comparable to those of current PSAs. These biodiesel-based thermoplastic elastomers hold promise for sustainability and high value-added economy.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“… e Mechanical properties determined on an ASTM D1708 with microtensile bars and reported in refs − and ref . …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Multiblock Thermoplastic Elastomers Derived from Biodiesel, Poly(propylene glycol), and l-Lactide

Lee

Yuk

Park

et al. 2017

ACS Sustainable Chem. Eng.

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Reactive Functionally Terminated Polyorganosiloxanes

Pang

Koh

Liu

et al. 2020

Silicon Containing Hybrid Copolymers

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Synthesis and characterization of novel urethane‐siloxane copolymers with a high content of PCL‐PDMS‐PCL segments

Pergal

Antić

Govedarica

et al. 2011

J of Applied Polymer Sci

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Novel polyurethane copolymers derived from 4,4 0 -methylenediphenyl diisocyanate (MDI), 1,4-butanediol (BD) and a,x-dihydroxy-[poly(caprolactone)-polywere synthesized by a two-step polyaddition reaction in solution. In the synthesis of the polyurethanes, the PCL blocks served as a compatibilizer between the nonpolar PDMS blocks and the polar comonomers, MDI and BD. The synthesis of thermoplastic polyurethanes (TPU) with high soft segment contents was optimized in terms of the concentrations of the reactants, the molar ratio of the NCO/OH groups, and the time and temperature of the polyaddition reaction. The structure, composition, and hard MDI/BD segment length of the synthesized polyurethane copolymers were determined by 1 H, 13 C-NMR, and two-dimensional correlation (COSY, HSQC, and HMBC) spectroscopy, while the hydrogen bonding interactions in the copolymers were analyzed by FT-IR spectroscopy. The influence of the reaction conditions on the structure, molecular weight, thermal, and some physical properties was studied at constant composition of the reaction mixture. A change in the molar ratio of the NCO/OH groups and the reaction conditions modified not only the molecular weight of the synthesized polyurethanes, but also the microstructure and therefore the thermal and physical properties of the copolymers. It was demonstrated that only PCL segments with high soft segment contents crystallize, thereby showing spherulitic morphology.

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Synthesis and characterization of (AB)n-type poly(l-lactide)–poly(dimethyl siloxane) multiblock copolymer and the effect of its macrodiol composition on urethane formation

Cited by 18 publications

References 42 publications

Multiblock Thermoplastic Elastomers Derived from Biodiesel, Poly(propylene glycol), and l-Lactide

Multiblock Thermoplastic Elastomers Derived from Biodiesel, Poly(propylene glycol), and l-Lactide

Reactive Functionally Terminated Polyorganosiloxanes

Synthesis and characterization of novel urethane‐siloxane copolymers with a high content of PCL‐PDMS‐PCL segments

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