Effects of molecular weight on poly(ω-pentadecalactone) mechanical and thermal properties

Cai, Jiali; Liu, Chen; Cai, Minmin; Zhu, Jie; Zuo, Feng; Hsiao, Benjamin S.; Gross, Richard A.

doi:10.1016/j.polymer.2010.01.007

Cited by 70 publications

(89 citation statements)

References 41 publications

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“…15,34 However, it is peculiar that this transesterification does lead to cyclic PPDL and PLLA, but not to cyclic copolymers consisting of a combination of PDL and LLA. For example, a peak is present at 1706.1 g·mol , which corresponds to cyclic (PDL) 7 + Na + , while there is no peak present at 1706.1 + x72.06 g·mol −1 (x lactidyl units). However, the presence of a repeating unit of 72 g·mol −1 having a similar intensity as the repeating unit of 144 g·mol −1 , does suggest rapid transesterification within PLLA segments.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…2−6 Recently, it was found that polymacrolactones and related polyesters having a large methylene/ester ratio have properties resembling polyethylene. 7,8 Hence, these polymers could function as polyethylene mimics and block copolymers based on such polyesters with polyethylene-like properties can be prepared easily by the sequential ring-opening copolymerization (ROP) of macrolactones and smaller polar lactones. 9−11 Copolymerization of macrolactones and small-ring (strained) lactones has been reported by several authors.…”

Section: ■ Introductionmentioning

confidence: 99%

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Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

et al. 2015

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Block copolymers consisting of a polyethylene block and a polar polymer block are interesting structures for the compatibilization of polyethylene/polar polymer blends or polyethylene-based composites. Since the synthesis of polyethylene-based block copolymers is an elaborate process, diblock copolymers consisting of “polyethylene-like” poly(pentadecalactone) (PPDL) and poly(l-lactide) (PLLA) were synthesized using a one-pot, sequential-feed ring-opening polymerization of pentadecalactone (PDL) and l-lactide (LLA). The peculiar activity of the used aluminum salen catalysts yielded a block copolymer consisting of two blocks with both a high dispersity, as a result of intrablock transesterification. Interestingly, interblock transesterification was effectively suppressed. The obtained poly(PDL-block-LLA) of various block lengths showed coincidental crystallization of the two blocks with an associated microphase-separated morphology, in which PLLA spheres with a high dispersity are distributed within the PPDL matrix. The complex morphologies is believed to arise from the presence of a whole range of block sizes as a consequence of the large dispersity of both blocks. The application of these block copolymers as compatibilizers for high density polyethylene (HDPE)/PLLA blends led to a clear change in blend morphology and a steep decrease in particle size of the dispersed phase. Furthermore, addition of the block copolymers to blends of linear low density polyethylene (LLDPE) and PLLA led to a significant increase in adhesion between the two phases. For both HDPE/PLLA and LLDPE/PLLA blends, the compatibilization efficiency of the poly(PDL-block-LLA) increased when the length of the PPDL block was increased. The presented results clearly show that PPDL can function as a substituent for various types of polyethylene, which opens up a new method for compatibilizing polyethylene with polar polymers using easy attainable “PE-like” block copolymers.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

et al. 2015

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“…Poly(ω-pentadecalactone)(PPDL) as one important poly(ω-hydroxy fatty acid) is a crystalline polymer which has 14 methylene groups and in-chain ester group linkage in each repeating unit, and presents high melting point close to 100 °C. Furthermore, PPDL presents good mechanical properties comparable to linear high density polyethylene(HDPE) [1][2][3] . More and more attention has been paid to PPDL researches for its promising industrial-scale production because of its possible biodegradability, good thermal stability and mechanical properties [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…There has been a report about zinc octoate(2-ethylhexanoate) as initiator to polymerize PDL, but the obtained molecular weight was as low as 1500 [9] . On the other hand, there have been many studies on enzymatic ring-opening polymerization of macrolactones recently [2,[10][11][12][13][14] . The monomers could be enzymatically polymerized even faster than small and medium-membered lactones, maybe due to their better recognition of the macrolactone by lipase.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is always necessary to take a long time and to consume large quantities of enzymes for the polymerization of macrolactones. For the polymerization of PDL, 10%(mass fraction) of Novozym 435 was used as the catalyst in a period of 24 h at 70 °C in toluene to get a molecular weight of 8.1×10 4 [2] . The polymerization process is complicated with the solvent, and enzyme is not easy to be removed from the system, especially at a high w M of product.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of poly(ω-pentadecalactone) for its industrial-scale production

Chang

Yang

et al. 2015

Chem. Res. Chin. Univ.

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The synthesis of biomaterial poly(ω-pentadecalactone)(PPDL) with yttrium isopropoxide as initiator in bulk was explored for its industrial-scale production. The weight-average molecular weight( w M ) of PPDL could be controlled by the molar ratio of monomer to initiator(M/I), polymerization temperature(T p ) and period(t p ). The synthesis conditions were optimized, and a high w M of 9.2×10 4 of PPDL could be obtained by the reaction at an M/I molar ratio of 1000/1 and 100 °C for only 30 min, which presented tough properties with a tensile strength of about 20 MPa and an elongation at break of about 300%. This mechanical property was comparable to that of high density polyethylene(HDPE). The melting point was about 96 °C, and 5% of mass loss temperature(T 5% ) was as high as 340 °C. Thus, the PPDL with good mechanical properties and high thermal stability can be synthesized without solvent at low expenses.

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Enzymatic Polymerization

Kobayashi¹

2011

Encyclopedia of Polymer Science and Technology

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Developments in enzymatic polymerization, a method of polymer synthesis, are comprehensively reviewed. The method, which has been developed over the past few decades, utilizes enzymes as catalysts for in vitro reactions. Characteristics of enzymatic catalysis are discussed. Synthesis of natural and unnatural polysaccharides employs hydrolase enzyme catalysts for polycondensation and ring‐opening polyaddition. Some of these polysaccharides are difficult to synthesize by a conventional chemical method. A variety of functionalized polyesters are synthesized in most cases by lipase catalysts via polycondensation as well as ring‐opening polymerization. Some new polymer synthesis approaches have been developed. Enzyme‐catalyzed modification is also mentioned for polyester synthesis. Oxidative polymerizations of aromatic compounds like phenols and anilines produce various functional aromatic polymers. Owing to the characteristic nature of enzymatic polymerization, the opportunity for “green polymer chemistry” is emphasized.

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Effects of molecular weight on poly(ω-pentadecalactone) mechanical and thermal properties

Cited by 70 publications

References 41 publications

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

Block Copolymers of “PE-Like” Poly(pentadecalactone) and Poly(l-lactide): Synthesis, Properties, and Compatibilization of Polyethylene/Poly(l-lactide) Blends

Synthesis and characterization of poly(ω-pentadecalactone) for its industrial-scale production

Enzymatic Polymerization

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