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The purpose of this paper is to assess the immediate and lagged effects of founder's turnover on firm performance, and test the moderating effects of enterprise scale and founders' tenure on enterprise performance.

The paper selects 307 listed companies founded by founder from the Listed Company's Financial Database provided by the China Center for Economic Research. Based on 1,535 observations, this paper tests the relationship between founder turnover and performance by using the random effect model and the fixed effect model.

It is found that founders' turnover will have a significant immediate and negative effect on firm performance. There exists a lagged effect of founders' turnover, but this lagged effect is not as strong as immediate effect. It is also found that the effect of founders' turnover has been moderated by firm size and founders' characteristics.

Founders should choose an appropriate time of leaving when the firm's performance has reached a level high enough for the successor to have a better chance of improving its future operations.

Although some scholars have recognized the special role of founders and that enterprises' performances are mainly determined by the founders, few have studied founders' turnover on firm performance directly and empirically. This paper expands understanding of the founders' departure behavior on firm performance.

This paper aims to propose a suitable atomizing solidification chitosan (CS) gel liquid extrusion molding technology for the three dimensional (3D) printing method, and experiments verify the feasibility of this method.

This paper mainly uses experimental means, combined with theoretical research. The preparation method, solidification forming method and 3D printing method of CS gel solution were studied. The CS gel printing mechanism and printing error sources are analyzed on the basis of the CS gel ink printing results, printing performance with different ratios of components by constructing a gel print prototype, experiments evaluating the CS gel printing technology and the effects of the process parameters on the scaffold formation.

CS printing ink was prepared; the optimal formula was found; the 3 D printing experiment of CS was completed; the optimal printing parameters were obtained; and the reliability of the forming prototype, printing ink and gel printing process was verified, which allowed for the possibility to apply the 3 D printing technology to the manufacturing of a CS gel structure.

This study can provide theoretical and technical support for the potential application of CS 3 D printed gels in tissue engineering.