Phase structure and crystallization behavior of polyethylene （PE） in its blends with cis-1,4-butadiene rubber （BR） at different blend ratios and sample preparation conditions were studied. The PE is finely dispers...Phase structure and crystallization behavior of polyethylene （PE） in its blends with cis-1,4-butadiene rubber （BR） at different blend ratios and sample preparation conditions were studied. The PE is finely dispersed in the BR matrix. For samples hot pressed at 145 ℃, circular PE microdomains with randomly oriented PE lamellar aggregates were produced. The domain size and number increase with increasing PE content. When the PE content is over 10 wt%, most of the PE domains impinged each other. The separated PE domains are connected by PE stripes with parallel arranged lamellar aggregates. For samples hot pressed at 140 ℃, elongated PE microdomains with oriented PE lamellar aggregates were obtained due to the shear flow. The crystallization of PE in the blends depends on the phase structure. Confined crystallization of PE occurs in small microdomains at relatively low temperature. With the increase of domain size, the crystallization ability of PE increases while the confined crystallization decreases.展开更多
Cobalt and nickel complexes （la-ld and 2a-2d, respectively） supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element anal...Cobalt and nickel complexes （la-ld and 2a-2d, respectively） supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element analysis, and complex la was further characterized by single-crystal X-ray diffraction. The solid state structure of complex la displayed a distorted tetrahedral geometry. Upon activation with ethylaluminum sesquichloride （EASC）, all the complexes showed high activities toward 1,3-butadiene polymerization. The cobalt complexes produced polymers with high cis-1,4 contents and high molecular weights, while the nickel complexes displayed low cis-l,4 selectivity and the resulting polymers had low molecular weights. The catalytic activities of the complexes highly depended on the ligand structure. With the increment of polymerization temperature, the cis-1,4 content and the molecular weight of the resulting polymer decreased.展开更多
目的:观察腺苷蛋氨酸联合肝爽颗粒治疗酒精性肝病患者的临床疗效及对肝纤维化指标的影响。方法:选取2019年7月至2021年6月陕西中医药大学附属医院肝病医院收治的110例酒精性肝病患者作为研究对象,按照随机数字表法随机分为观察组和对照...目的:观察腺苷蛋氨酸联合肝爽颗粒治疗酒精性肝病患者的临床疗效及对肝纤维化指标的影响。方法:选取2019年7月至2021年6月陕西中医药大学附属医院肝病医院收治的110例酒精性肝病患者作为研究对象,按照随机数字表法随机分为观察组和对照组,每组55例。对照组给予酒精性肝病基础疗法结合肝爽颗粒治疗,肝爽颗粒温开水冲服,1袋/次,3次/d。观察组给予丁二磺酸腺苷蛋氨酸联合肝爽颗粒治疗,肝爽颗粒服用方案同对照组,同时注射丁二磺酸腺苷蛋氨酸1.0 g+250 mL 0.9%氯化钠注射液缓慢静脉滴注,1次/d。2组均1个月为1个疗程,治疗3个疗程。分别于治疗前后检测肝功指标[直接胆红素(DBIL)、谷氨酰转移酶(GGT)、胆汁酸(BA)]、肝纤维化指标[脯氨酸肽酶(PLD)、Ⅳ型胶原(Ⅳ-C)、Ⅰ型前胶原氨端肽原(PINP)]、炎症介质[干扰素诱导蛋白-10(IP-10)、C-X-C基序趋化因子配体1(CXCL1)、可溶性血管细胞黏附分子-1(VCAM-1)],记录2组患者治疗期间发生的不良反应,计算总有效率。结果:治疗后,2组患者DBIL、GGT、BA水平均较治疗前降低,且观察组DBIL、GGT、BA水平均低于对照组,差异有统计学意义(P<0.05);治疗后,2组患者PLD、Ⅳ-C、PINP水平均较治疗前降低,且观察组PLD、Ⅳ-C、PINP水平均低于对照组,差异有统计学意义(P<0.05)。治疗后,2组患者IP-10、CXCL1、VCAM-1水平均较治疗前降低,且观察组IP-10、CXCL1、VCAM-1水平均低于对照组,差异有统计学意义(P<0.05)。治疗期间观察组、对照组患者不良反应发生率分别为12.73%(7/55)、9.09%(5/55),差异无统计学意义(P>0.05)。观察组、对照组总有效率分别为90.91%(50/55)、74.55%(41/55),观察组总有效率高于对照组,差异有统计学意义(P>0.05)。结论:丁二磺酸腺苷蛋氨酸联合肝爽颗粒治疗酒精性肝病效果显著,可改善肝功能及肝纤维化状态,降低炎症介质水平,治疗安全性较高。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21274009 and 51221002)
文摘Phase structure and crystallization behavior of polyethylene （PE） in its blends with cis-1,4-butadiene rubber （BR） at different blend ratios and sample preparation conditions were studied. The PE is finely dispersed in the BR matrix. For samples hot pressed at 145 ℃, circular PE microdomains with randomly oriented PE lamellar aggregates were produced. The domain size and number increase with increasing PE content. When the PE content is over 10 wt%, most of the PE domains impinged each other. The separated PE domains are connected by PE stripes with parallel arranged lamellar aggregates. For samples hot pressed at 140 ℃, elongated PE microdomains with oriented PE lamellar aggregates were obtained due to the shear flow. The crystallization of PE in the blends depends on the phase structure. Confined crystallization of PE occurs in small microdomains at relatively low temperature. With the increase of domain size, the crystallization ability of PE increases while the confined crystallization decreases.
基金financially supported by the 973 Program(No.2015CB654700 or 2015654702)the National Natural Science Foundation of China(Nos.51473156 and 51203147)
文摘Cobalt and nickel complexes （la-ld and 2a-2d, respectively） supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element analysis, and complex la was further characterized by single-crystal X-ray diffraction. The solid state structure of complex la displayed a distorted tetrahedral geometry. Upon activation with ethylaluminum sesquichloride （EASC）, all the complexes showed high activities toward 1,3-butadiene polymerization. The cobalt complexes produced polymers with high cis-1,4 contents and high molecular weights, while the nickel complexes displayed low cis-l,4 selectivity and the resulting polymers had low molecular weights. The catalytic activities of the complexes highly depended on the ligand structure. With the increment of polymerization temperature, the cis-1,4 content and the molecular weight of the resulting polymer decreased.
文摘目的:观察腺苷蛋氨酸联合肝爽颗粒治疗酒精性肝病患者的临床疗效及对肝纤维化指标的影响。方法:选取2019年7月至2021年6月陕西中医药大学附属医院肝病医院收治的110例酒精性肝病患者作为研究对象,按照随机数字表法随机分为观察组和对照组,每组55例。对照组给予酒精性肝病基础疗法结合肝爽颗粒治疗,肝爽颗粒温开水冲服,1袋/次,3次/d。观察组给予丁二磺酸腺苷蛋氨酸联合肝爽颗粒治疗,肝爽颗粒服用方案同对照组,同时注射丁二磺酸腺苷蛋氨酸1.0 g+250 mL 0.9%氯化钠注射液缓慢静脉滴注,1次/d。2组均1个月为1个疗程,治疗3个疗程。分别于治疗前后检测肝功指标[直接胆红素(DBIL)、谷氨酰转移酶(GGT)、胆汁酸(BA)]、肝纤维化指标[脯氨酸肽酶(PLD)、Ⅳ型胶原(Ⅳ-C)、Ⅰ型前胶原氨端肽原(PINP)]、炎症介质[干扰素诱导蛋白-10(IP-10)、C-X-C基序趋化因子配体1(CXCL1)、可溶性血管细胞黏附分子-1(VCAM-1)],记录2组患者治疗期间发生的不良反应,计算总有效率。结果:治疗后,2组患者DBIL、GGT、BA水平均较治疗前降低,且观察组DBIL、GGT、BA水平均低于对照组,差异有统计学意义(P<0.05);治疗后,2组患者PLD、Ⅳ-C、PINP水平均较治疗前降低,且观察组PLD、Ⅳ-C、PINP水平均低于对照组,差异有统计学意义(P<0.05)。治疗后,2组患者IP-10、CXCL1、VCAM-1水平均较治疗前降低,且观察组IP-10、CXCL1、VCAM-1水平均低于对照组,差异有统计学意义(P<0.05)。治疗期间观察组、对照组患者不良反应发生率分别为12.73%(7/55)、9.09%(5/55),差异无统计学意义(P>0.05)。观察组、对照组总有效率分别为90.91%(50/55)、74.55%(41/55),观察组总有效率高于对照组,差异有统计学意义(P>0.05)。结论:丁二磺酸腺苷蛋氨酸联合肝爽颗粒治疗酒精性肝病效果显著,可改善肝功能及肝纤维化状态,降低炎症介质水平,治疗安全性较高。
