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PET的解聚-共缩聚“一锅法”合成生物降解高分子的研究 被引量:2
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作者 张红明 赵君宇 +3 位作者 高凤翔 刘顺杰 周庆海 王献红 《高分子学报》 SCIE CAS CSCD 北大核心 2022年第9期1142-1149,共8页
发展聚对苯二甲酸乙二醇酯(PET)再生利用新途径是学术界和产业界均十分关注的研究方向,而传统的化学转化法存在着工艺流程长、能耗高的问题.本文利用不同结构的二元醇将PET醇解成低分子量预聚物,然后加入二元酸进一步进行酯化、缩聚,使... 发展聚对苯二甲酸乙二醇酯(PET)再生利用新途径是学术界和产业界均十分关注的研究方向,而传统的化学转化法存在着工艺流程长、能耗高的问题.本文利用不同结构的二元醇将PET醇解成低分子量预聚物,然后加入二元酸进一步进行酯化、缩聚,使PET解聚和共聚反应通过“一锅法”完成,省去了复杂、高耗能的单体提纯过程,且PET原料可以100%再生,所制备的高分子材料具有生物降解性能.值得指出的是,选择不同的醇解剂和二元酸可以实现再生高分子材料结构和性能关系的调控.本文提出的“解聚-共缩聚”合成生物降解高分子方法,对推动PET的高值化回收再生有较高参考价值. 展开更多
关键词 聚对苯二甲酸乙二醇酯 化学转化 解聚 共缩聚 生物降解高分子
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Relationship Between Clinical and Immunological Features with Magnetic Resonance Imaging Abnormalities in Female Patients with Neuropsychiatric Systemic Lupus Erythematosus 被引量:5
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作者 Hai-Peng Wang Cui-Yan Wang +2 位作者 Zheng-Lun Pan jun-yu zhao Bin zhao 《Chinese Medical Journal》 SCIE CAS CSCD 2016年第5期542-548,共7页
Background:Conventional magnetic resonance imaging (MRI) is the preferred neuroimaging method in the evaluation ofneuropsychiatric systemic lupus erythematosus (NPSLE).The purpose of this study was to investigate... Background:Conventional magnetic resonance imaging (MRI) is the preferred neuroimaging method in the evaluation ofneuropsychiatric systemic lupus erythematosus (NPSLE).The purpose of this study was to investigate the association between clinical and immunological features with MRI abnormalities in female patients with NPSLE,to screen for the value of conventional MRI in NPSLE.Methods:A total of 59 female NPSLE patients with conventional MRI examinations were enrolled in this retrospective study.All patients were classified into different groups according to MRI abnormalities.Both clinical and immunological features were compared between MRI abnormal and normal groups.One-way analysis of variance was used to compare the systemic lupus erythematosus disease activity index (SLEDAI) score for MRI abnormalities.Multivariate logistic regression analysis investigated the correlation between immunological features,neuropsychiatric manifestations,and MRI abnormalities.Results:Thirty-six NPSLE patients (61%) showed a variety of MRI abnormalities.There were statistically significant differences in SLEDAI scores (P 〈 0.001),incidence of neurologic disorders (P =0.001),levels of 24-h proteinuria (P =0.001) and immunoglobulin M (P =0.004),and incidence of acute confusional state (P =0.002),cerebrovascular disease (P =0.004),and seizure disorder (P =0.028) between MRI abnormal and normal groups.In the MRI abnormal group,SLEDAI scores for cerebral atrophy (CA),cortex involvement,and restricted diffusion (RD) were much higher than in the MRI normal group (P 〈 0.001,P =0.002,P =0.038,respectively).Statistically significant positive correlations between seizure disorder and cortex involvement (odds ratio [OR] =14.90;95% confidence interval [CI],1.50-151.70;P =0.023) and cerebrovascular disease and infratentorial involvement (OR =10.00;95% CI,1.70-60.00;P =0.012) were found.Conclusions:MRI abnormalities in NPSLE,especially CA,cortex involvement,and RD might be markers of high systemic lupus erythematosus activity.Some MRI abnormalities might correspond to neuropsychiatric manifestations and might be helpful in understanding the pathophysiology of NPSLE. 展开更多
关键词 Magnetic Resonance Imaging: Neuropsychiatric Symptoms Systemic Lupus Erythematosus Systemic Lupus Erythematosus Disease Activity Index
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