Polymer nanofiber sheet and method of producing the sheet
a technology of polymer nanofiber and nanofiber sheets, which is applied in the field of polymer nanofiber sheets and a production method, can solve the problems of inability to provide a structural body having a sufficient strength, structural body having a low mechanical strength, and structural body having a practical us
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example 1
Preparation of Polymer Solution
[0084]Polycaprolactone (PCL, molecular weight: 80,000, manufactured by Sigma-Aldrich) as a polymer material and poly(ethylene glycol) diglycidyl ether as a low-molecular weight epoxy compound were mixed. At this time, a mixing ratio between the PCL and the poly(ethylene glycol) diglycidyl ether was set to 92:8 in terms of a weight ratio. Next, the mixture was further mixed with a mixed solution obtained by mixing dichloromethane (DCM) and dimethylformamide (DMF). Thus, 1 mL of a solution of the polymer material having a concentration of 10 wt % was prepared. At this time, a mixing ratio between DCM and DMF was set to 75:25 (volume ratio). Next, SI-60L (manufactured by SANSHIN CHEMICAL INDUSTRY CO., LTD.) which is an aromatic sulfonium salt-based latent catalyst was mixed at a ratio of 10 wt % with respect to the low-molecular weight epoxy compound.
[0085][Sheet-Forming Step]
[0086]The prepared solution was injected and spun by an electrospinning method. ...
example 2
Preparation of Polymer Solution
[0090]Polyethylene oxide (PEO, manufactured by Sigma-Aldrich) as a polymer material and pure water were mixed to prepare 2 ml of a 6 wt % aqueous solution of the PEO. Next, the aqueous solution of the PEO was mixed with ethylene glycol diglycidyl ether (Mw=174) as a low-molecular weight epoxy compound. At this time, the amount in which the low-molecular weight epoxy compound was mixed was adjusted so that the ratio of the low-molecular weight epoxy compound to the PEO became 10 wt %. Further, the latent catalyst used in Example 1 was mixed at the same ratio as that of Example 1.
[0091][Sheet-Forming Step]
[0092]A polymer nanofiber sheet was obtained in the same manner as in Example 1 except that conditions shown in Table 1 were adopted.
[0093][Crosslinking Step]
[0094]The resultant polymer nanofiber sheet was sandwiched between mesh plates. After that, the resultant was subjected to heating treatment using an oven at 40° C. for 4 hours in the coexistence o...
example 3
Preparation of Polymer Solution
[0096]Polystyrene (PS, molecular weight: 280,000, manufactured by Sigma-Aldrich) as a polymer material and DMF were mixed to prepare 1 ml of a 30 wt % PS / DMF solution. Next, the PS / DMF solution was mixed with a bisphenol A-type epoxy compound (“AER-6017”, manufactured by Asahi Kasei Epoxy Co., Ltd., Mn=2,700) as a low-molecular weight epoxy compound. At this time, the amount in which the low-molecular weight epoxy compound was mixed was adjusted so that the ratio of the low-molecular weight epoxy compound to the polystyrene became 10 wt %. Further, the latent catalyst used in Example 1 was mixed at the same ratio as that of Example 1.
[0097][Sheet-Forming Step and Crosslinking Step]
[0098]A polymer nanofiber sheet in which polymer nanofibers were crosslinked by the derivative of the low-molecular weight epoxy compound (crosslinked part) was obtained in the same manner as in Example 1 except that conditions shown in Table 1 were adopted.
[0099]Table 1 show...
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