Nucleation effect of cyclodextrin inclusion complexes on the crystallization of isotactic poly(1‐butene)

Abstract

The β‐cyclodextrin (β‐CD) and γ‐cyclodextrin (γ‐CD) inclusion complexes (ICs) with four kinds of polyolefin were prepared. The crystallization behavior of isotactic poly(1‐butene) (iPB‐1) blended with these CDs and ICs was investigated by differential scanning calorimetry, polarized optical microscopy, and wide‐angle X‐ray diffraction. The iPB‐1 blended with the ICs was found to exhibit higher crystallization temperature (TC), smaller spherulites, and faster crystallization rate than neat iPB‐1. These results indicate that the ICs can act as nucleating agent on the crystallization of iPB‐1 and induce the accelerated crystallization. The guest molecules of ICs play an important role in the nucleation effect of ICs on the crystallization of iPB‐1. ICs with polyolefin having higher TC as guest molecules have higher nucleation effect than the one with polyolefin having lower TC as guest molecules. And, the CDs and ICs induce different crystal form of iPB‐1. The crystal of iPB‐1 blended with CDs is defective, whereas the crystal of iPB‐1 blended with ICs is more perfect. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 389–395, 2010

Nucleation effects of α-cyclodextrin inclusion complexes on the crystallization behavior of biodegradable poly(1,4-butylene adipate)

“…However, with the addition of PCLIC, the number of nuclei increased markedly and the average diameter of the spherulites was reduced, indicating superior nucleating activity, which is consistent with the DSC analysis. The above results are consistent with the phenomenon described by Li et al, 23 where the ICs formed with the polymer having guest molecules with a higher T C will have a higher nucleation effect than the one with the polymer having lower T C guest molecules. Furthermore, the ICs with guest molecules having a higher molecular weight will have a higher nucleation effect than the ones with lower molecular weight guest molecules.…”

“…It was recently reported that the addition of CD and its inclusion complex to biodegradable polymers can effectively enhance the crystallization rate of the polymer. [20][21][22][23] The reduction of T C and enhancement of the crystallization rate may be important for increasing the thermodynamic stability of the polymer. Such enhancement by a-CD leads to an increase in the glass transition temperature of the polymer in the complexed state.…”

Piezoresistive and mechanical Behavior of CNT based polyurethane foam

“…Different strategies have been tried to obtain smart nanocomposite with different properties, like piezoresistivity (sensors) and conductivity (electrical connection). The most recent researches proved that adding carbon nanoparticles (such as graphene nano platelets (GNP), or carbon black (CB), or carbon nanotubes (CNT)) to commercial polymer composites can provide an improvement of the mechanical behaviors [1][2][3], thermal conductivity [4,5], electric conductivity [6][7][8][9], and piezoresistive behavior [10][11][12][13][14].…”

Preparation and characterization of benzoyl‐hydrazide‐derivatized poly(lactic acid) and γ‐cyclodextrin inclusion complex and its effect on the performance of poly(lactic acid)

“…[15][16][17] At present, a large number of potential nucleating agents have been reported in the literature, which include inorganic nucleating agents, such as nanoclays, [18,19] layered metal phosphonates, [20] and organic nucleating agents such as amide derivatives, [21,22] hydrazide compounds, [23] and supramolecules. [24] So that the problem of poor compatibility with the polymeric matrix can be overcome, the choice of an appropriate organic nucleating agent is crucial. In recent years, cyclodextrins (CDs) and their inclusion complexes (ICs) have been found to effectively enhance the crystallization rates of polymers.…”

“…In addition to this, the solid‐state morphology of sheared polymers is also altered, which improves the physical and optical properties of the materials, while retaining their inherent useful properties . At present, a large number of potential nucleating agents have been reported in the literature, which include inorganic nucleating agents, such as nanoclays, layered metal phosphonates, and organic nucleating agents such as amide derivatives, hydrazide compounds, and supramolecules …”