CAJ | 학술논문

在西藏拉萨地区中对滚塑包装箱专用高密度聚乙烯(HDPE)进行了18个月的自然老化试验，以研究其在极端气候环境下的老化特性与规律。采用衰减全反射红外光谱(ATR-FT-IR)和 X 射线衍射技术分析了材料老化前后微观结构指标羰基指数、羟基指数、支化程度、断链程度、不饱和度变化趋势及晶体结构变化特点，进一步确定其老化行为，并通过对氧化特征谱带洛伦兹分峰拟合，探究氧化产物的生成规律。结果表明，材料老化初期支化和氧化作用显著，老化中期支化和断链作用仍为主要的老化行为，氧化作用一定程度上放缓，老化后期断链则占主导地位。老化过程中晶体结构基本不变，晶胞参数小幅度变化，老化中氧化产物以酮羰基为主，γ内酯羰基为二次氧化产物，且二者生成趋势相反，酯羰基和醛羰基的增长出现前期增长缓慢后期加速的特点。
재서장랍살지구중대곤소포장상전용고밀도취을희(HDPE)진행료18개월적자연노화시험，이연구기재겁단기후배경하적노화특성여규률。채용쇠감전반사홍외광보(ATR-FT-IR)화 X 사선연사기술분석료재료노화전후미관결구지표탄기지수、간기지수、지화정도、단련정도、불포화도변화추세급정체결구변화특점，진일보학정기노화행위，병통과대양화특정보대락륜자분봉의합，탐구양화산물적생성규률。결과표명，재료노화초기지화화양화작용현저，노화중기지화화단련작용잉위주요적노화행위，양화작용일정정도상방완，노화후기단련칙점주도지위。노화과정중정체결구기본불변，정포삼수소폭도변화，노화중양화산물이동탄기위주，γ내지탄기위이차양화산물，차이자생성추세상반，지탄기화철탄기적증장출현전기증장완만후기가속적특점。
In order to study the aging profile of high density polyethylene (HDPE)used as rotational packaging case under the extreme conditions,the nature exposure test was carried out for 18 months in Lasa Tibet.The structural changes of carbonyl index,hydroxyl index,branching degree,chain scission degree,unsaturation de-gree and crystal structure were monitored,by attenuated total reflection infrared spectroscopy (ATR-FT-IR) and X-ray diffraction,to determine the degradation behavior.Finally,the character peaks of oxidation products were analyzed by Lorentz distribution technology.The results showed that the chain branching & oxidation play a leading role in the early aging progress.Then the chain branching & chain breaking gradually takes place in the interim aging progress with a slow oxidation progress.The chain breaking is predominant in the later aging progress.The crystalline structure is basically unchanged after aging,but the cell parameters are weakly changed.The ketone is the primary oxidation product,with opposite generate trend to the secondary oxidation product,γ lactone.The oxidation products of aldehyde and ester increase slowly in the early aging progress, then rapidly.