Direct Comparison of Crystal Nucleation Activity of PCL on Patterned Substrates

Hu, Jian; Xin, Rui; Hou, Chunyue; Yan, Shouke; Liu, Jichun

doi:10.1007/s10118-019-2226-z

Cited by 28 publications

(44 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The WAXD pattern shows only an amorphous halo, demonstrating the suppression of H-PCL crystallization by PVC in the cooling process from 100 to 40 °C. This is in good accordance with the literature reports and has even been observed in the PCL/PVC blend on the oriented polyethylene substrate, which is confirmed to exhibit high nucleation ability toward PCL [ 29 , 37 , 53 ]. Actually, the crystallization of H-PCL in the H-PCL/PVC can take place at 40 °C with prolonged time.…”

Section: Resultssupporting

confidence: 93%

“…On the other hand, the crystallization of poly[(R)-3-hydroxybutyrate] (PHB) in its miscible blends with PVDF under strain causes an a -axis orientation of PHB along the stretching direction [ 21 ]. For the crystalline/crystalline polymer blends, the crystal structure and orientation of later crystallized components can be controlled by epitaxy or transcrystallization at the surface of early formed crystals [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ], which may not reflect the effect of strain and the blending component on the later crystallized component correctly. It should be pointed out that soft epitaxy can hardly take place in crystalline/amorphous polymer blends, since it is not a common phenomenon [ 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

et al. 2020

View full text Add to dashboard Cite

The blends of high and low molecular weights poly(ε-caprolactone) (PCL) with poly(vinyl chloride (PVC) were prepared. The samples before and after the crystallization of PCL were uniaxially stretched to different draw ratios. The orientation features of PCL in a stretched crystalline PCL/PVC blend and crystallized from the amorphous PCL/PVC blends under varied strains were studied by wide-angle X-ray diffraction (WAXD). It was found that a uniaxial stretching of crystalline PCL/PVC blend with high molecular weight PCL results in the c-axis orientation along the stretching direction, as is usually done for the PCL bulk sample. For the stretched amorphous PCL/PVC blend samples, the crystallization of high molecular weight PCL in the blends under a draw ratio of λ = 3 with a strain rate of 6 mm/min leads to a ring-fiber orientation. In the samples with draw ratios of λ = 4 and 5, the uniaxial orientation of a-, b-, and c-axes along the strain direction coexist after crystallization of high molecular weight PCL. With a draw ratio of λ = 6, mainly the b-axis orientation of high molecular weight PCL is identified. For the low molecular weight PCL, on the contrary, the ring-fiber and a-axis orientations coexist under a draw ratio of λ = 3. The a-axis orientation decreases with the increase of draw ratio. When the λ reaches 5, only a poorly oriented ring-fiber pattern has been recognized. These results are different from the similar samples stretched at a higher strain rate as reported in the literatures and demonstrate the important role of strain rate on the crystallization behavior of PCL in its blend with PVC under strain.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

et al. 2020

View full text Add to dashboard Cite

show abstract

“…DSC thermograms in Figure S4a and data in Table 3 show a slightly higher melting temperature ( T m ) for the biocomposites. A similar result was reported for PCL crystallization on PP and PE, with surface T m up to 7.2°C higher than bulk PCL T m [49] . TGA analysis, Table 3 and Figure S4B,C, show that the maximum degradation temperature shifts toward higher values in the presence of the PCL‐grafted AFs, compared with the similar molecular weight reference PCL.…”

Section: Resultssupporting

confidence: 82%

Grafting of poly(ε‐caprolactone) from Abaca cellulose fibers via ring‐opening polymerization resulting in facile one‐pot biocomposites

et al. 2021

View full text Add to dashboard Cite

As efforts to replace nonsustainable plastics increase, biocomposites from cellulose fibers and biodegradable polymers like poly(ε‐caprolactone) (PCL) are promising candidates. The necessary adhesion between fibers and matrix can be achieved by grafting polymeric chains onto the fibers. Herein, we report grafting of PCL onto Abaca fibers (AFs), a one‐pot method to obtain a composite containing grafted fiber and free PCL, and the characterization of prepared composite films. Three parameters for pretreatment (disintegration, drying, and solvent exchange) of AF were compared. Short and long PCL chains with molecular weights below and close to the chain entanglement weight of PCL were grafted from AFs. Using benzyl alcohol as an additional initiator, free PCL was simultaneously prepared. The unreacted monomer was removed by precipitation in water, resulting in ready‐made one‐pot composites. The biocomposites containing the free PCL and PCL‐grafted AFs were further processed by a combination of compounding and hot‐pressing. The analyzed mechanical (tensile) and rheological properties show a large dependence on the lengths of the PCL grafts. The herein‐reported composites pave the way for interesting bio‐based alternatives to plastic, especially looking at the tailoring of material properties.

show abstract

“… 5 − 7 In past decades, surface modification of the nanomaterial, 8 − 11 modification of the polymer, 12 preparing polymer composites via an in situ polymerization method, 13 − 15 and adding a compatibilizer 16 , 17 as effective methods were developed to enhance the interfacial interactions. The epitaxial crystallization, which is a kind of surface-induced crystallization, 18 can effectively enhance the interfacial interaction and avoid the destruction of polymer–inorganic nanocomposites. 19 − 24 Epitaxy is generally defined as the growth of one phase on the surface of another phase in one or more strictly defined crystallographic orientation, and the orientation is explained by two-dimensional (2D) or one-dimensional (1D) structural analogy in the plane of contact of the two species.…”

Section: Introductionmentioning

confidence: 99%

In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

2021

View full text Add to dashboard Cite

Epitaxial crystallization between Polyamide 66 (PA66) and reduced graphene oxide (RGO) can enhance the interfacial interaction and the mechanical properties of PA66/RGO nanocomposites. In situ two-dimensional synchrotron radiation wide angle X-ray diffraction and small angle X-ray scattering were used to track the structural evolution of the PA66/RGO nanocomposites with an epitaxial crystal during uniaxial deformation. In the PA66/RGO nanocomposites, the structural evolution of non-epitaxial and epitaxial crystals could be clearly analyzed. The non-epitaxial crystal, whose crystal plane can slip, shows the rearrangement and the Brill transition during uniaxial deformation. While the PA66 chains of an epitaxial crystal are held by RGO, the crystal plane could therefore not slip. The epitaxial crystal also constrains the deformation of the amorphous phase and the crystal form transition of non-epitaxial crystals around them. With the content increase of epitaxial crystals, the constraint effect becomes more obvious. Therefore, the rigid epitaxial crystals in the PA66/RGO nanocomposites promote mechanical properties. The present findings can deepen the understanding of structural evolution during the tensile deformation of PA66/RGO nanocomposites and the influence of the epitaxial crystals on the mechanical property in semicrystalline polymers with a H-bond.

show abstract

Direct Comparison of Crystal Nucleation Activity of PCL on Patterned Substrates

Cited by 28 publications

References 33 publications

Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

Grafting of poly(ε‐caprolactone) from Abaca cellulose fibers via ring‐opening polymerization resulting in facile one‐pot biocomposites

In Situ SAXS and WAXD Investigations of Polyamide 66/Reduced Graphene Oxide Nanocomposites During Uniaxial Deformation

Contact Info

Product

Resources

About