Novel polymeric nanocomposites and porous materials prepared using organogels

Lai, Wei–Chi; Tseng, Shen-Chen

doi:10.1088/0957-4484/20/47/475606

Cited by 11 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our earlier studies, 12 DBS organogels were used as selfassembled scaffolds for preparing polystyrene (PS) nanocomposites and porous materials. DBS molecules were dissolved in styrene/initiator mixtures at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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

Lai

2011

Soft Matter

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

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

Lai

2011

Soft Matter

Self Cite

View full text Add to dashboard Cite

“…1,3:2,4-Di-O-benzylidene-D-sorbitol (DBS) and its methylsubstituted derivatives, 1,3:2,4-di-O-p-methylbenzylidene-D-sorbitol (MDBS) and 1,3:2,4-di-O-m,p-dimethylbenzylidene-D-sorbitol (DMDBS) as shown in Scheme 1, are commercially available chiral amphiphilic polyols with a buttery shaped structure, and have been widely used as nucleating agents in polymers, such as poly(ethylene terephthalate), 23 polypropylene [24][25][26] and poly(L-lactic acid), 27 and the self-assembled nanobrils also act as reinforcing agents to improve the mechanical properties of polymers, such as epoxy and polystyrene. 28,29 Later, they were found to be versatile gelators for a wide range of low molecular mass organic liquids due to their chirality and hydrogen bonding. [30][31][32][33][34][35][36] Janssen et al 6 rst used DBS to gel an LC host, and reported the electrically controlled light scattering characteristics of the LC physical gel lm, but the driving voltage was high, i.e.…”

Section: Introductionmentioning

confidence: 99%

High modulus and low-voltage driving nematic liquid-crystalline physical gels for light-scattering displays

Peng

Long

et al. 2013

Soft Matter

View full text Add to dashboard Cite

Liquid-crystalline (LC) physical gels with a high modulus and low driving voltage were prepared through the self-assembly of sorbitol derivatives as gelators in a nematic liquid crystal, 4-pentyl-4 0 -cyanobiphenyl (5CB). The structural difference among the used gelators, i.e. 1,3:2,4-di-O-benzylidene-D-sorbitol (DBS), 1,3:2,4-di-O-p-methylbenzylidene-D-sorbitol (MDBS) and 1,3:2,4-di-O-m,p-dimethylbenzylidene-D-sorbitol (DMDBS), is only the number of methyl groups on their phenyl rings. The phase transition temperature, mechanical and electro-optical properties of three LC gels were systematically investigated. Compared with DBS, MDBS and DMDBS with methyl groups on phenyl rings have higher gelation ability in 5CB.The three LC gels exhibit good self-supporting ability with storage moduli higher than 10 4 Pa when the gelator content is increased to 1.5 wt%. At 3.0 wt% and a gelator content less than 1.0 wt%, both moduli of MDBS and DMDBS gels are obviously higher than that of DBS gel due to the enhanced reinforcement of the more rigid, thicker nano-fibrils and the formed nano-fibrillar network texture in MDBS and DMDBS gels. Also, the driving voltages of LC gels decrease in the order of DBS, MDBS and DMDBS gels with increase of LC domain size and nano-fibril diameter. For DMDBS gel with 3.0 wt% gelators, the threshold voltage and saturation voltage are only 0.5 and 3.5 V mm À1 , showing its potential application in self-supporting light-scattering electro-optical displays.

show abstract

“…DBS gels could provide commercial and technological benefits for electrolytes, cosmetics, and so on. , Recently, DBS gels have been used as templates to synthesize porous polymers such as polystyrene (PS). Moreover, because of the presence of nanofibrillar networks, these gels can act as reinforcing materials to enhance the thermal and mechanical properties of PS …”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior and Crystal Structure of Poly(l-lactic acid) with 1,3:2,4-Dibenzylidene-d-sorbitol

Lai

2011

J. Phys. Chem. B

Self Cite

View full text Add to dashboard Cite

This study investigated the effect of 1,3:2,4-dibenzylidene-D-sorbitol (DBS) on the thermal behavior and crystal structure of poly(L-lactic acid) (PLLA) by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Different PLLA crystal structures (α- or α'-form crystal) were found by the change of the DBS amount and PLLA crystallization temperature. The order and regular α-form of PLLA was favored as the DBS component was added. The α-form crystal formed more at lower temperatures. Therefore, the disorder-to-order (α'-to-α) phase-transition temperature of PLLA was found to shift at lower temperatures as more DBS content was added. In the proposed structure of PLLA with DBS, the DBS molecules are stacked together through π-π interaction to form a strand with the PLLA molecules by hydrogen bonding. Because of these interactions, PLLA could have a more regular structure with the addition of DBS. In addition, the equilibrium melting point and glass-transition temperature of PLLA were not significantly changed with the addition of DBS. However, the addition of DBS changed the crystal structure of PLLA and thus affected the crystallization rate of PLLA.

show abstract

Novel polymeric nanocomposites and porous materials prepared using organogels

Cited by 11 publications

References 37 publications

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

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

High modulus and low-voltage driving nematic liquid-crystalline physical gels for light-scattering displays

Thermal Behavior and Crystal Structure of Poly(l-lactic acid) with 1,3:2,4-Dibenzylidene-d-sorbitol

Contact Info

Product

Resources

About