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硬质聚氯乙烯自然老化的变色行为与分子结构变化
Color and Molecular Structure Changes of Natural Aged Rigid PVC
- 高分子学报 2017年第8期 页码：1374-1381
- 作者机构：
高分子材料工程国家重点实验室 四川大学高分子研究所 成都 610065
- 作者简介：
熊英, E-mail:xiongying@scu.edu.cn Ying Xiong, E-mail:xiongying@scu.edu.cn
- 基金信息：国家自然科学基金(51133005)
DOI：10.11777/j.issn1000-3304.2017.16345
中图分类号：纸质出版日期：2017-8，
收稿日期：2016-12-2，
修回日期：2017-1-20，
扫 描 看 全 文
徐文文, 熊英, 郭少云. 硬质聚氯乙烯自然老化的变色行为与分子结构变化[J]. 高分子学报, 2017,(8):1374-1381.
Xu Wen-wen, Xiong Ying, Guo Shao-yun. Color and Molecular Structure Changes of Natural Aged Rigid PVC[J]. Acta Polymerica Sinica, 2017,(8):1374-1381.
徐文文, 熊英, 郭少云. 硬质聚氯乙烯自然老化的变色行为与分子结构变化[J]. 高分子学报, 2017,(8):1374-1381. DOI： 10.11777/j.issn1000-3304.2017.16345.
Xu Wen-wen, Xiong Ying, Guo Shao-yun. Color and Molecular Structure Changes of Natural Aged Rigid PVC[J]. Acta Polymerica Sinica, 2017,(8):1374-1381. DOI： 10.11777/j.issn1000-3304.2017.16345.
摘要
以硬质聚氯乙烯（PVC）为研究对象，通过色差实验、FTIR、UV等方法探究了PVC在湿热、辐射低的琼海和暖温、干旱且辐射高的若羌地区自然老化的变色行为与分子结构变化.结果表明，太阳辐射是影响PVC自然老化过程中变色行为和分子结构变化的主要环境因素，PVC在干旱、辐射高的若羌地区比在湿热、辐射低的琼海地区更易变黄和变红，而在两地变暗的程度相近；这是因为随着自然老化时间的延长，PVC逐渐发生脱除氯化氢反应和氧化反应，在干旱且辐射高的若羌，更易发生脱除氯化氢反应，而在湿热且辐射低的琼海，脱除氯化氢反应和氧化反应的速度相近，在若羌老化的PVC样品生成了更多的共轭长度（
n
）≥ 8的C=C长共轭序列所致.
Abstract
The effects of different natural environment on rigid PVC natural aging were studied in detail. Rigid PVC samples were placed in Sinkiang Ruoqiang country and Hainan Qionghai city of China
respectively
for natural aging. Then
color and corresponding molecular structure changes of the natural aged PVC were investigated by chromatic aberration
FTIR and UV methods. In particular
monthly solar radiation in Ruoqiang is 508.25 MJ/m
2
which is higher than that of Qionghai. But average temperature
medial humidity
monthly total precipitation and oxygen pressure in Ruoqiang are far lower than those in Qionghai. As a result
color change and molecular structure change of the rigid PVC samples aged in the two places were different. It was found that brightness (△
L
) of PVC surface decreased with increase of aging time. However
redness (△
a
)
yellowness (△
b
) and color difference (△
E
) increased with increase of aging time. In addition
redness (△
a
)
yellowness (△
b
) and color difference (△
E
) of the PVC aged in Ruoqiang were larger than those in Qionghai. Meanwhile
surface color change was accompanied by molecular structure change. Firstly
FTIR results showed that C=C and C=O were formed and they increased with the aging time
which indicated that dehydrochlorination and oxidation reactions took place. And when aged in Ruoqiang
the amount of C=C was larger than C=O
indicating that dehydrochlorination played a dominant role. When aged in Qionghai
the amount of C=C was similar to that of C=O
indicating that dehydrochlorination was at a similar reaction speed with oxidation. Secondly
UV results confirmed that C=C long conjugated sequence (conjugation length ≥ 8) of PVC increased with aging time. In addition
the amounts of C=C
C=O and C=C long conjugated sequence (conjugation length ≥ 8) of PVC aged in Ruoqiang were larger than those in Qionghai. Thirdly
it was also found that there was a good correlation between the color change and the C=C long conjugated sequence (conjugation length ≥ 8)
but C=O groups contributed little to color change. Finally
it was concluded that solar radiation was the main environmental factor that affected natural aging of rigid PVC. Based on this
rigid PVC materials underwent more remarkable color change and molecular structure change when aged in Ruoqiang.
关键词
硬质PVC自然老化太阳辐射变色行为C=C长共轭序列
Keywords
Rigid PVCNatural agingSolar radiationColor changeC=C long conjugated sequence
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