聚酰胺1010辐射效应的机理及结构  

Irradiation on Polyamide 1010:Effect on the Structure and Mechanism

作　　者：李志宏[1] 王君林[2] 张利华[3] 陈欣方[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130012 [2]中国科学院长春光学精密机械与物理研究所 [3]中国科学院长春应用化学研究所

出　　处：《应用化学》2007年第1期30-34,共5页Chinese Journal of Applied Chemistry

基　　金：国家"八六三"计划资助(2002AA304010)

摘　　要：通过WAXD、DSC和凝胶测定等技术对聚酰胺1010(PA1010)及其有多官能团单体BMI的PA1010体系的辐照效应进行测试和讨论。结果表明,PA1010的辐射交联的机理与聚集态结构及第二组分密切相关。其交联机理是多重的,由初期的端效应和强化交联过程导致的非无规反应,经非晶区主链的无规交联过程,到结晶表面中间相的非无规过程反应。PA1010增强交联体系(M／P),单体M存在于非晶区和结晶与非晶界面,导致了初期非晶区辐射交联q0-f(D),按非无规规律发生,加速交联交联抑制裂解重排过程,加速结晶表面缺陷的生成和积累。由此可见,辐照PA1010及M／P体系结晶辐射损伤始于晶面。对于m(BMI):m(PA1010)比值从0:100到5:100的结晶样品,其结晶损伤的起点随着BMI含量的增加从10 000 kGy下降至4 500 kGy。结果表明,辐照PA1010的△Hm的变化只与体系的交联度有关,△Hm可作为辐射交联的度量和特征,对于非晶PA1010,当交联指数v>0．7时,其升温过程中的冷结晶过程受到阻碍,对于结晶PA1010,当交联指数v> 1．3时,其结晶开始损伤。Irradiated polyamide（PA） 1010 system was investigated by using WAXD, DSC and gel fraction measurement techniques. The result indicates that the mechanism of irradiation cross linking of PAl010 is closely related to the structures of molecule aggregation and the second component. The mechanism of cross linking is multiplicity, which is a process from end-effect and strengthened cross linking to non-ruleless reactions to ruleless cross linking of main chains in the amorphous sections. For the strengthened cross linking PA1010 system, the monomers exist in the amorphous sections or between the boundary of amorphous sections and the crystalline ones, which results in the irradiated cross linking in the amorphous sections in a ruleless way during the initial stages, accelerates the cross linking and promotes the formation and accumulation of the defects on the crystalline surfaces. The crystalline surfaces were damaged when the system of PA1010 and M/P were irradiated. For the crystalline samples, when the ratio of m（BMI） ： m（PAIOIO） varied from 1：100 to 5： 100, the jumping-off point of crystalline damaging decreased from 10 000 kGy to 4 500 kGy with the increasing of the content on BMI. The results indicated that the variation of △Hm of irradiated PA1010 system only had relation with the degree of cross linking, and △Hm could be regarded as the measurement and character for irradiated cross linking. For amorphous PA1010, when the cross linking exponent v 〉 0. 7, the coldcrystallizing process would be blocked during the heating process, as for crystalline PA1010, the crystal began to be damaged when v 〉 1.3.

关 键 词：聚酰胺1010 非晶 结晶 辐射损伤 交联机理 

分 类 号：O644[理学—物理化学]