Research on the Preparation of Modified Polyacrylic Acid Superabsorbent Resin and Its Potential Application in Fruit Preservation in Combination with Chinese Herbal Medicine Composites
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- Keywords: Superabsorbent Resin; Salt Resistance; Biodegradation; Fruit Preservation
- Abstract: In order to enhance the water absorption capacity and degradation performance of acrylic acid superabsorbent resin (PAA), this paper used 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and naturally degradable macromolecular carboxymethyl cellulose (CMC) as modifiers and adopted the aqueous solution polymerization method to prepare modified polyacrylic acid (PAA) superabsorbent resin. The results showed that when the content of acrylic acid was 21%, and the contents of AMPS, CMC, cross-linking agent and initiator were 20%, 1.8%, 0.02% and 2% of the mass of AA respectively, the water absorption capacity of the prepared PAA superabsorbent resin in deionized water increased from 483 g/g before modification to 875 g/g, and the water absorption capacity in physiological saline was 238 g/g. The degradation rate of the modified PAA in cellulase was 64.8%. It can be seen that the modification with CMC and AMPS can improve the water absorption, salt resistance and degradation performance of PAA resin. Meanwhile, the composite material of modified PAA superabsorbent resin and Chinese herbal medicine powder can prolong the shelf life of fruits and vegetables. The research results can provide a reference for the further research of fruit preservatives and a new idea for the expanded application of superabsorbent resins.
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China’s Emergency Language Services During the COVID-19 Pandemic—Status Quo, Problems, and Solutions
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- Keywords: COVID-19; Emergency language services (ELS); Emergency translation; Emergency interpreting; Language rescue; China
- Abstract: The COVID-19 pandemic has struck the whole world and posed great challenges to emergency language services (ELS), a much-neglected field of study in China. During the fight against the pandemic, ELS responded quickly to the unprecedented demands by mobilizing all possible means to facilitate doctor-patient communication and cater to other people’s various needs. This study, by relying on desktop research and semi-structured interviews with people directly or indirectly involved in ELS, tries to explore the status quo, features, and inadequacies of China’s ELS during the COVID-19 pandemic and offters suggestions for its future development. ELS has tremendously facilitated China’s fight against the pandemic, especially in emergency translation, emergency interpreting, emergency publicity, emergency consultation, and emergency online education, during which technologies have played a vital role. However, due to the unexpected and serious nature of the disaster and China’s lack of related experience in ELS, there is still much room for improvement in laws and regulations, national leadership, talent banks, talent training, ELS for special groups of people, and technological support. This study is hoped to share the merits and demerits of China’s ELS experience with the international community, boost its further development, and enrich its research content.
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国家社会科学基金项...
