The effect of self-assembled nanofibrils on the morphology and microstructure of poly(l-lactic acid)

Lai, Wei–Chi

doi:10.1039/c0sm01170c

Cited by 27 publications

(32 citation statements)

References 27 publications

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“…It is obvious that all samples show the typical diffraction peaks of polyethylene, and the characteristic lattice planes of α crystal, that is, (110) and (200) at 21.6° and 23.9° are observed. This is different from the single‐polymer system‐like poly( l ‐lactic acid) and isotactic polypropylene, where DBS fibrils have an important effect on polymer crystal structure.…”

Section: Resultsmentioning

confidence: 75%

Crystallization and microporous membrane properties of ultrahigh molecular weight polyethylene with dibenzylidene sorbitol

Liu

Zhao

2014

J of Applied Polymer Sci

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Dibenzylidene sorbitol (DBS) was chosen as an in situ forming nucleating agent to study ultrahigh molecular weight polyethylene (UHMWPE) crystallization and microporous membrane. The experimental results indicated that DBS self-assembled into fibrils first and the solution became a physical gel before UHMWPE crystallization during thermally induced phase separation (TIPS) of UHMWPE/liquid paraffin (LP)/DBS solution, and the temperature of DBS self-assembly shows a strong dependence of DBS concentration. With decreasing temperature further, DBS fibrils as heterogeneous nucleating agent accelerated UHMWPE crystallization, which was showed more clearly in UHMWPE/LP/DBS phase diagram. UHMWPE microporous membranes were prepared through TIPS method with the control of DBS concentration. It was found that UHMWPE microporous membranes in the presence of DBS fibrils show small porous size and low water permeability, but relatively larger mechanical strength. V C 2014 Wiley Periodicals, Inc. J. Appl.Polym. Sci. 2014, 131, 40706.

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Section: Resultsmentioning

confidence: 75%

Crystallization and microporous membrane properties of ultrahigh molecular weight polyethylene with dibenzylidene sorbitol

Liu

Zhao

2014

J of Applied Polymer Sci

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“…78,87 Lai and Tseng demonstrated the polymerization of styrene using DBS as a template. 91 In order to orient polymer crystallisation, DBS derivative 1,3:2,4-di(3,4-dimethylbenzylidene)-D-sorbitol was used in polypropylene (PP). The obtained material remained transparent and homogeneous and it was proved that the DBS fibrils remained intact in the final product, showing that the thermal polymerization process did not affect the DBS network.…”

Section: Polymers With Embedded Dbs Network For Enhanced Performancementioning

confidence: 99%

1,3:2,4-Dibenzylidene-d-sorbitol (DBS) and its derivatives – efficient, versatile and industrially-relevant low-molecular-weight gelators with over 100 years of history and a bright future

et al. 2015

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Dibenzylidene-D-sorbitol (DBS) has been a well-known low-molecular-weight gelator of organic solvents for over 100 years. As such, it constitutes a very early example of a supramolecular gel--a research field which has recently developed into one of intense interest. The ability of DBS to self-assemble into sample-spanning networks in numerous solvents is predicated upon its 'butterfly-like' structure, whereby the benzylidene groups constitute the 'wings' and the sorbitol backbone the 'body'--the two parts representing the molecular recognition motifs underpinning its gelation mechanism, with the nature of solvent playing a key role in controlling the precise assembly mode. This gelator has found widespread applications in areas as diverse as personal care products and polymer nucleation/clarification, and has considerable potential in applications such as dental composites, energy technology and liquid crystalline materials. Some derivatives of DBS have also been reported which offer the potential to expand the scope and range of applications of this family of gelators and endow the nansocale network with additional functionality. This review aims to explain current trends in DBS research, and provide insight into how by combining a long history of application, with modern methods of derivatisation and analysis, the future for this family of gelators is bright, with an increasing number of high-tech applications, from environmental remediation to tissue engineering, being within reach.

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“…) is chiral and amphiphilic, and is often described as “butterfly‐like”, with a sorbitol body and two benzylidene “wings” . As a polymer gelator, DBS readily gels a wide variety of polymer melts like polypropylene glycol (PPG), polyethylene glycol (PEG), PPG‐PEG copolymers, poly(L‐lactic acid), polystyrene, polyethylene and polypropylene (PP) . At temperatures below the polymer melting point, DBS may serve as a nucleation agent and thus increase the rate of crystallization of semi‐crystalline polymer systems, resulting in higher degree of crystallinity and lamellae thickness .…”

Section: Introductionmentioning

confidence: 99%

In silico studies of 1,3(R):2,4(S)‐dibenzylidene‐D‐sorbitol as a gelator for polypropylene

Alperstein

Knani

2012

Polymers for Advanced Techs

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The organic gelator 1,3(R):2,4(S)‐dibenzylidene‐D‐sorbitol (DBS) self‐organizes to form a 3‐D network at relatively low concentrations in a variety of nonpolar organic solvents and polymer melt. In this work, we have investigated the interactions between DBS molecules in polypropylene (PP) by molecular modeling. We have used quantum mechanics to elucidate the preferred geometry of one molecule and a dimer of DBS, and molecular mechanics and molecular dynamics to simulate pure DBS, pure PP, and mixture of DBS and PP as condensed phases, at various temperatures. It was found that inter‐ and intramolecular H‐bonds between DBS molecules are formed in PP in a much more pronounced manner than those formed in pure DBS. The most significant intermolecular H‐bonds are formed between the terminal hydroxyl groups. The most significant intramolecular H‐bonds are formed between O5 /H‐O6 groups. Due to the H‐bonds, DBS molecules form a rigid structure similar to liquid crystal forming molecules, which might explain their tendency to create nanofibrils. It seems that the aromatic rings do not contribute significantly to the intermolecular interactions. Their main role is probably to stiff the molecular structure. Temperature dependences of inter‐ and intramolecular interactions are different. Whereas intermolecular interactions peak heights decrease when temperature increases for pure DBS, the intramolecular interaction almost does not change. Copyright © 2012 John Wiley & Sons, Ltd.

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The effect of self-assembled nanofibrils on the morphology and microstructure of poly(l-lactic acid)

Cited by 27 publications

References 27 publications

Crystallization and microporous membrane properties of ultrahigh molecular weight polyethylene with dibenzylidene sorbitol

Crystallization and microporous membrane properties of ultrahigh molecular weight polyethylene with dibenzylidene sorbitol

1,3:2,4-Dibenzylidene-d-sorbitol (DBS) and its derivatives – efficient, versatile and industrially-relevant low-molecular-weight gelators with over 100 years of history and a bright future

In silico studies of 1,3(R):2,4(S)‐dibenzylidene‐D‐sorbitol as a gelator for polypropylene

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