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The research purpose of this study is to explore the status and causes of learning burnout among college students and dig out the countermeasures of solving this issue. The study takes 400 students of different majors, grades and genders from three normal universities as subjective in Southwest China, and the questionnaires including demographic information, learning burnout status, learning burnout causes were distributed to them, finally, 395 valid questionnaires were collected. Using IBM SPSS Statistics 22.0 software for statistical analysis (T-test), the results shows that there exists the phenomenon of learning burnout among university students, and there are significant differences in learning burnout in terms of gender, grade and major; Meanwhile, through regression analysis, it can be seen that each factor has different degrees of influencing the learning burnout, so the accordingly countermeasures are suggested. The study is hoped to put forward some countermeasures for learning burnout, so that it is better service the educational quality.

The overarching objective of this study was to explore online learning effect of English writing combining teachers’ teaching engagement with perceptive interaction behaviour of students. The Utrecht Work Engagement Scale (UWES) of online teaching and the questionnaire of perceptive interaction behaviours from students were adopted to find the appropriate participants in this study, and finally four teachers with different levels of work engagement (high vs. low) were selected and 100 undergraduates in university with Perceptive Oral Interaction (POI) and Perceptive Written Interaction (PWI) were verified, One-way ANOVA were used to check the homogeneity of variances (p< .05). Through the writing test scores, the two-way ANOVA was conducted to find whether the teachers’ engagement (high vs. low) affects students’ English writing learning, whether the types of perceptive interaction behaviours (POI vs. PWI) affect their English writing learning gains, and whether there is an interaction between teachers’ engagement and types of perceptive interaction behaviours on their English writing learning. The results shows that there is a significant interaction between teacher’s online work engagement and students’ online behavioural perceptive interaction, and students with POI behaviour under the guidance of high work engagement from teachers yield higher learning gains than the other groups. However, the results also shows that students with POI got lower effect than students with PWI when they all met the teachers with low online work engagement, which need to be further studied in the future.

The flame-retarded paper-based polyvinyl chloride (PVC) wallcoverings were successfully prepared, using plant fiber paper as base material and adding inorganic flame retardants and flame-retarded plasticizer as additives. Flame retardancy, thermostability, smoke suppression and mechanical properties were tested regarding to the prepared wallcoverings. The results showed that 2ZnO·3B2O3·3.5H2O could improve flame retardancy and thermostability of paper-based PVC wallcoverings; plasticizer tricresyl phosphate increased flame retardancy of the prepared materials auxiliarily. Also, flame-retarded paper-based PVC wallcoverings with higher flame retardancy, smoke suppression and mechanical property was prepared using plant fiber paper with fix quantity of 90 g/m3 as base material, using 2ZnO·3B2O3·3.5H2O as inorganic flame retardant, and using tricresyl phosphate as plasticizer. For the flame-retarded paper-based PVC wallcoverings in this study, the limit oxygen index (LOI) reaches 32.3, maximal smoke density is 16.91 %, and the horizontal and longitudinal wet tensile strength reaches 1.38 kN·m−1 and 1.51 kN·m−1 respectively. Meanwhile, its flame retardancy meets the requirements about flame retardancy for material Class B1 listed in Chinese National Standards GB 8624-2012, Classification for burning behavior of building materials and products. This research creates an effective path to prepare paper-based PVC wallcoverings with high flame retardancy.