检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:夏其博 宋杭岭 陈蓉[1] 郭少云[1] Qibo Xia;Hangling Song;Rong Chen;Shaoyun Guo(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute,Sichuan University,Chengdu 610065,China)
机构地区:[1]高分子材料工程国家重点实验室,四川大学高分子研究所,四川成都610065
出 处:《高分子材料科学与工程》2020年第4期49-54,共6页Polymer Materials Science & Engineering
基 金:国家自然科学基金创新研究群体科学基金(51721091);四川省科技厅应用基础(重大前沿)(2018JY0548)。
摘 要:通过不同相对分子质量聚三氟氯乙烯(PCTFE)复配来改善其耐应力开裂性,以期在不添加其他功能助剂的情况下改善韧性,从而最大限度保持其优良的光学透明性和介电性能。采用动态流变学研究了PCTFE共混体系的流变特性。结果表明,不同相对分子质量PCTFE共混相容性较好,随着高相对分子质量PCTFE含量的增加,共混物分子链缠结程度增加,分子链运动能力下降,共混体系更多表现为弹性行为。偏光显微镜和差示扫描量热结果表明,高相对分子质量PCTFE的加入使其晶体尺寸显著减小,结晶度有所降低。当高相对分子质量PCTFE用量为30%时,共混物冲击强度相比于未改性PCTFE提高了140%,呈现出韧性断裂特征。Poly(trifluorochloroethylene)(PCTFE)is one of the most important thermoplastic fluororesins.Due to its regular molecular structure and large crystal size,the products are usually brittle,sensitive to notches and prone to stress cracking.In this paper,PCTFE with different molecular weight were blended to improve its cracking resistance,and the toughness is enhanced,without the addition of other functional aids.The dynamic rheology results of the PCTFE blends show that PCTFE with different molecular weight has good compatibility.When the PCTFE content of the higher molecular weight(that is,PCTFE-M)increases,the entanglement of the molecular chains is enhanced,resulting in the restriction of the molecular mobility.The results of polarized optical microscope(POM)and differential scanning calorimetry(DSC)exhibit that the crystal size and the crystallinity of PCTFE are decreased after the addition of PCTFE-M.When the content of PCTFE-M is 30%,the impact strength of the blends is 140%higher than that of unmodified PCTFE,exhibiting typical ductile fracture behavior.
关 键 词:聚三氟氯乙烯 共混物 动态流变 增韧改性 冲击强度
分 类 号:TQ327[化学工程—合成树脂塑料工业]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:3.129.89.50