Abstract Objective: Emergence delirium is a common complication in children. Recorded mother’s voice, as a non-pharmacological measure, is increasingly used to prevent the emergence of delirium in pediatric patients, but sufficient evidence is still needed to prove its efficacy. Methods: Embase, PubMed, Cochrane Library, Web of Science, CINAHL, and Sinomed databases were searched for randomized controlled trials exploring the efficacy of recorded mother’s voice in preventing the emergence of delirium in pediatric patients undergoing general anesthesia. The original data were pooled for the meta-analysis with Review Manager 5.4.1. This study was conducted based on the Cochrane Review Methods. Results: Eight studies with 724 children were included in the analysis. Recorded mother’s voice reduced the incidence of emergence delirium when compared with either no voice (RR: 0.45; [95 % CI, 0.34 - 0.61]; p < 0.01; I2 = 7 %) or stranger’s voice (RR: 0.51; [95 % CI, 0.28 - 0.91]; p = 0.02; I2 = 38 %) without increasing other untoward reactions. In addition, it shortened the post-anesthesia care unit stay time when compared with no voice (MD = -5.64; [95 % CI, -8.43 to -2.58]; p < 0.01, I2 = 0 %), but not stranger’s voice (MD = -1.23; [95 % CI, -3.08 to 0.63]; p = 0.19, I2 = 0 %). It also shortened the extubation time and reduced the incidence of postoperative rescue analgesia. Conclusion: The current analysis indicated that recorded mother’s voices could reduce the incidence of emergency delirium, shorten post-anesthesia care unit stay time and extubation time, and decrease the incidence of postoperative rescue analgesia in children. Objective mothers mother s nonpharmacological non pharmacological measure Methods Embase PubMed Library Science CINAHL anesthesia metaanalysis meta 541 5 4 1 5.4.1 Results 72 RR (RR 0.45 045 45 95 [9 CI 034 34 0.3 0.61 061 61 0.61] 0.01 001 01 I strangers stranger 0.51 051 51 028 28 0.2 0.91 091 91 0.91] 0.02 002 02 3 reactions addition postanesthesia post MD 5.64 564 64 -5.64 8.43 843 8 43 -8.4 2.58 258 2 58 -2.58] %, , 1.23 123 23 -1.23 3.08 308 08 -3.0 0.63 063 63 0.63] 019 19 0.19 %. . Conclusion 54 5.4. 0.4 04 9 [ 03 0. 0.6 06 6 0.0 00 0.5 05 0.9 09 5.6 56 -5.6 8.4 84 -8. 2.5 25 -2.58 1.2 12 -1.2 3.0 30 -3. 0.1 5.4 5. -5. 8. -8 2. -2.5 1. -1. 3. -3 -5 -2. -1 -2

Abstract Two series of fluorinated copolymerized polyimide films with different dianhydride ratios were prepared via the conventional two-step method by using 4,4-oxydianiline(ODA) as the diamine monomer, 4,4'-(hexafluoroisopropylidene) diphthalic anhydride(6FDA), 4,4'-oxydiphthalic anhydride(ODPA) and 3,3',4,4'- biphenyl tetracarboxylic dianhydride(BPDA) as the dianhydride monomer in N, N-dimethylacetamide. With the increase of 6FDA in the proportion of dianhydride, the tensile strength of the polyimide film showed a decreasing trend. This work provided a high performance film. The mass retention rate at 800°C was above 50%. The glass transition temperatures of the two films were 260 °C and 275 °C. The storage modulus of the two were 1500 MPa and 1250 MPa. The loss modulus were 218.70 MPa and 120.74 MPa. The transmittance of the film was 71.43%. The transmittance of fluorinated copolymerized polyimide films were significantly improved in the visible region of ultraviolet light, indicating that the polyimide film with high transmittance, high tensile strength, high heat resistance and high storage modulus was successfully prepared. It had an excellent application prospect in the field of flexible display.