近些年,为了提高大棚的透光性,提高作物的产量和质量,农用棚膜亲水涂层得到广泛关注,市场上出现了各种亲水涂层。但是对于表面张力的研究却很少。为此,在聚乙烯(PE)薄膜上制备不同配比PVA/Al_(2)O_(3)亲水涂层及丙烯酸、丙烯酸六氟丁酯和4-丙烯酰氧基二苯甲酮三元共聚物亲水涂层,测量了对于三种液体(水、二碘甲烷、甲酰胺)的接触角。利用几何平均(OW)法和Lifshitz-van der Waals/酸碱(LW/AB)法间接计算亲水涂层的表面张力,并与未处理PE薄膜和电晕处理的PE薄膜进行对比,发现亲水涂层的表面张力大于电晕处理的PE薄膜和未处理的PE薄膜;且OW法计算得到PVA/Al_(2)O_(3)亲水涂层比例为5∶3时表面张力最大;LW/AB法计算得到PVA/Al_(2)O_(3)亲水涂层比例为5∶2时表面张力最大。由原子力显微镜得到的PVA/Al_(2)O_(3)亲水涂层比例为5∶3时粗糙度最大。本研究可为农用棚膜防雾滴涂层的开发提供理论指导。
为了进一步落实工程教育认证的相关理念,聊城大学高分子材料与工程专业采取校企联合教学模式和案例式启发教学方式,将质量管理体系、安全生产、环境保护等理念和实际工程案例融入《聚合物合成与加工课程设计》教学环节。该专业打破常规,采取课程设计报告和现场答辩相结合的考核方式。校企联合教学模式和综合式考核方式的实施,提升了本专业学生多角度思考问题和解决问题的能力,提高了学生团队协作和交流沟通的能力。To implement the concept of engineering education certification, the combined mode of university-enterprise joint teaching and case-based teaching was chosen by Polymer Materials and Engineering Specialty of Liaocheng University during the teaching procedure of Curriculum Design of Polymer Synthesis and Processing. Enterprise experts instructed actual engineering cases and the standards of quality management system, safety production, and environmental protection. Course design report and field defense were employed to evaluate the capacity training. For students, the forementioned teaching procedure was benefit in their improved ability of multi-perspective thinking and solving problems, coupling with the enhanced ability of team cooperation and communication.