CAJ | 학술논문

将高聚物由高弹态转变为流体态的转变温度命名为流动温度Tf ,该转变温度与高聚物分子量密切相关.在高聚物从高弹态转变为流体态的研究中,由于 Tl,l 的概念忽视对高聚物分子量的依赖性,因此采用Tf的概念更为合理.本文对高聚物的流动温度Tf的讨论涉及高聚物温度-形变曲线、高弹态温区、高聚物熔体切黏度.从高聚物凝聚态观点来看,高聚物熔体中凝聚缠结网络中的凝聚结点是分子链的局部向列相互作用使链单元间产生平行凝聚而形成的,而高聚物从高弹态到流体态的转变正是反映了高聚物熔体中凝聚缠结网络的物理交联点,即凝聚结点状态的变化.高聚物熔体可以流动,说明熔体中凝聚网络中的凝聚结点至少是可以在瞬间内打开的,升温使凝聚结点的解凝聚状态存在的时间加长,凝聚状态存在时间减短,当升高到某一温度时,在凝聚结点解凝聚状态的时间内,分子链通过内旋转使质量中心在外加力的方向上可以发生位移,此时高聚物从高弹态转变为流体态,而此时的温度就是流动温度Tf.对高聚物流体弛豫网络的研究,是一个很有前景的研究课题.
장고취물유고탄태전변위류체태적전변온도명명위류동온도Tf ,해전변온도여고취물분자량밀절상관.재고취물종고탄태전변위류체태적연구중,유우 Tl,l 적개념홀시대고취물분자량적의뢰성,인차채용Tf적개념경위합리.본문대고취물적류동온도Tf적토론섭급고취물온도-형변곡선、고탄태온구、고취물용체절점도.종고취물응취태관점래간,고취물용체중응취전결망락중적응취결점시분자련적국부향렬상호작용사련단원간산생평행응취이형성적,이고취물종고탄태도류체태적전변정시반영료고취물용체중응취전결망락적물리교련점,즉응취결점상태적변화.고취물용체가이류동,설명용체중응취망락중적응취결점지소시가이재순간내타개적,승온사응취결점적해응취상태존재적시간가장,응취상태존재시간감단,당승고도모일온도시,재응취결점해응취상태적시간내,분자련통과내선전사질량중심재외가력적방향상가이발생위이,차시고취물종고탄태전변위류체태,이차시적온도취시류동온도Tf.대고취물류체이예망락적연구,시일개흔유전경적연구과제.
On increasing the temperature of polymer a transition from a rubbery elastic state to a fluid state could occur. The transition temperature is termed the fluid temperature of the polymer, Tf, which has direct relation with the polymer molecular weight. As one of polymer parameters, special attention to Tf should be paied for polymer processing. In researches on the transition of polymer from a rubbery elastic state to a fluid state the concept Tf would be more reasonable and more effectve than the concept Tl,l because it is neglected in the concept Tl,l that the molecular weight of polymer has effects on the transition. In this paper the fluid temperature of polymer, Tf, is involved in the characters of polymer, such as the curve of deformation –temperature, rubbery elastic state and shear viscosity of melt. From the viewpoint of cohesional state of polymer the transition of polymer from a rubbery elastic state to a fluid state responds to destruction and construction of the cohesional entanglement network in the polymer. The relaxing network of polymer melt would be worthy to be considered as an object of study.