热处理对尼龙6及其与聚酰胺嵌段共聚物共混体系晶体熔融行为和结晶结构的影响  

INFLUENCE OF THERMAL TREATMENT ON CRYSTAL MELTING BEHAVIOR AND CRYSTAL STRUCTURE OF NYLON 6 AND POLYAMIDE BLOCK COPOLYMER/NYLON 6 BLENDS

作　　者：张燕珠[1] 刘四委[1] 黄爱萍[1] 张艺[1] 池振国[1] 许家瑞[1] 

机构地区：[1]聚合物复合材料及功能材料教育部重点实验室新型聚合物材料设计合成与应用广东省高校重点实验室中山大学化学与化学工程学院材料科学研究所,广州510275

出　　处：《高分子学报》2010年第2期231-236,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50873116;50473020);广东省科技厅项目(项目号2008B090500196;2007A090604006;2007A010500001-2;2006B11801001)资助

摘　　要：采用溶液共混-共沉淀的办法获得尼龙6及聚酰胺嵌段共聚物/尼龙6共混体系粉末,样品在260℃下熔融之后经程序降温的方法得到非淬火样品,然后分别在190℃下高温退火不同时间（0-48 h）,采用示差扫描量热仪（DSC）、广角X射线衍射仪（WAXD）、偏光显微镜（POM）等表征手段研究热处理对体系晶体熔融行为和结晶结构的影响.结果表明,（1）在相同的热历史条件下,嵌段共聚物的存在影响了尼龙6的结晶行为及结晶结构;（2）退火处理对两种样品有着不同的影响,对于尼龙6体系,退火处理促进了非晶相向晶相的转变,大大提高样品的结晶完善程度和结晶度;对于共混体系,退火处理同样促进了非晶相向晶相的转变,同时形成新的α型和γ型结晶,体系的结晶完善程度明显提高,退火48 h后,结晶度比原始样品提高约84%.Nylon 6 and its blends with a polyamide block copolymer were prepared by solvent blending and co-precipitation process.The samples were melted at 260℃ and then cooled at a rate of 30 K/min to obtain the controlled cooling samples（CCS）.Investigations were carried out on the influence of thermal treatment on crystal melting behavior and crystal structure of nylon 6 and the blends by differential scanning calorimetry（DSC）,wide-angle X-ray diffraction（WAXD） and polarized optical microscopy（POM）.Measurements were taken after annealing at 190℃ with varied time from 0 h to 48 h.The results indicated that the existing of the polyamide block copolymer affected the crystal behavior and the crystal structure of nylon 6,comparing to those of pure nylon 6 under the same thermal conditions.The pure nylon 6 tends to form α crystals,but it in the blends forms γ crystals.It was also found that annealing treatment had different effects on these two kinds of samples.For Nylon 6,annealing treatment only promoted the transformation of nylon 6 from amorphous to crystal phase,improved the crystalline structure and increased the crystal degree greatly without crystal form change.The crystal degree increased by about 61% after annealing for 48 h.For the blends,annealing treatment not only promoted the transformation from amorphous to crystal phase,improved the γ form crystalline structure and increased the crystal degree,but also resulted in the formation new α crystals.Compared with the original sample,the crystal degree increased by about 84% after annealing for 48 h.

关 键 词：尼龙6 聚酰胺嵌段共聚物 芳香聚酰胺 热处理 

分 类 号：O633.22[理学—高分子化学]