Deformation Temperature and Lamellar Thickness Dependency of FormⅠto Form Ⅲ Phase Transition in Synd

来源 :Chinese Journal of Polymer Science | 被引量 : 0次 | 上传用户:yifanvip
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Phase transition from form Ⅰto form Ⅲ in syndiotactic polypropylene crystallized at different conditions during tensile deformation at different temperatures was investigated by using in situ synchrotron wide angle X-ray diffraction technique. In all cases, the occurrence of this phase transition was observed. The onset strain of this transition was found to be crystalline thickness decided by crystallization temperature and drawing temperature dependent. The effect of drawing temperature on this phase transition is understood by the changes in mechanical properties with temperature. Moreover, crystalline thickness dependency of the phase transition reveals that this form I to from III phase transition occurs first in those lamellae with their normal along the stretching direction which have not experienced stress induced melting and recrystallization. Phase transition from form Ⅰto form Ⅲ in syndiotactic polypropylene crystallized at different conditions during tensile deformation at different temperatures was investigated by using in situ synchrotron wide angle X-ray diffraction technique. strain of this transition was found to be crystalline temperature decided by crystallization temperature and drawing temperature dependent. The effect of drawing temperature on this phase transition is understood by the changes in mechanical properties with temperature. this form I to from III phase transition occurs first in those lamellae with their normal along the stretching direction which have not experienced stress induced melting and recrystallization.
其他文献
通过理论计算研究,旨在对环戊酮分子激发态的解离机制进行分析,给出对实验具有验证和指导意义的结果。用量子化学从头算方法中的CIS(Configuration Interaction with Single
先入为主思路狭窄─—1例敌鼠钠中毒连续误诊的教训男,32岁。因全身皮肤瘀斑5夭、鼻出血3小时由当地卫生院以“血小板减少性紫癜”转来我院。病人于5天前下肢出现瘀点、瘀斑,2天内达全
西为欣引起粒细胞缺乏症1例黄坚,葛琼珊,庄生一(杭州市第一人民医院,杭州310006)患者,男,46a,于1991年12月10日以“咳嗽、胸闷、气急十二年,紫绀、下肢浮肿五年,加剧一月”为主诉入院.查体:T37.1 血压13.4/8kPa,发育欠佳,..
The molecular geometries, frontier molecular orbital properties, and absorption and emission properties of three 4-phenoxy-1,8-naphthalimide derivatives, namely
目的:探讨早期干预对出生窒息的高危新生儿体液免疫、生长激素(GH)和胰岛素样生长因子1(IGF-1)的影响及临床评估价值。方法:对本院病房出生的105例窒息高危新生儿进行分组研
超常量MTX鞘内注射致昏迷、抽搐抢救成功一例赵英豪我院近期收住1例急性早幼粒细胞性白血病(APL),在强化治疗过程中,为预防脑膜白血病,给予常规鞘内注射MTX,误注入超常量后致患者昏迷、抽搐,经
患者 ,女性 ,53岁 ,维吾尔族 ,以腹部胀痛 2 0天 ,加重 3天为主诉入院。查体 :血压 2 0 /1 4kPa,体温 3 7.4℃ ,脉搏 92次 /分 ,呼吸 2 2次 /分 ,心肺正常 ,腹部膨隆 ,如足月孕
A series of sulfonated polyimide copolymers as novel proton exchange materials were synthesized by the polycondensation of 1,4,5,8-naphthalene-tetracarboxylic d
酮康唑引起急性肝损害1例潘慧云(华西医科大学96号信箱,成都610041)男患,36a因咳嗽,咳痰,发热半月余,于90年11月19日入院(住院号:4247)。入院诊断:右侧肺炎;坏死因肺部霉菌感染,除继续服用地塞米松外,停用抗生素等
我院近6年来收治急性CO中毒926例,其中并发脑梗塞10例.本文就其临床特点及发病机理分析如下.1 临床资料1.1 一般资料 本组10例中,男8例,女2例.年龄50~72岁,平均60.5岁.均为重