CN117649863A - 含poss纳米材料的光致聚合物全息存储材料、制备方法及应用 - Google Patents
含poss纳米材料的光致聚合物全息存储材料、制备方法及应用 Download PDFInfo
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Abstract
本发明公开了一种含POSS纳米材料的光致聚合物全息存储材料、制备方法及应用,按照质量份数计包括以下组分:25~50份的成膜剂,5~25份的单体丙烯酰胺,1~10份的亚甲基双丙烯酰胺,0.1~1份的多面体齐聚倍半硅氧烷POSS,0.01~0.1份的光敏剂,1~10份的单体丙烯酸,0.1~2份的三乙醇胺。通过在聚乙烯醇/丙烯酰胺体系中掺杂POSS纳米材料并进行配比,显著改善了材料的体积收缩率,同时保持了原材料体系的高衍射效率、高感光灵敏度、高空间分辨率等性能指标,在全息显示、全息存储、干涉计量等领域有良好的应用价值。
Description
技术领域
本发明涉及光全息记录及存储材料技术领域,具体涉及一种含POSS纳米材料的光致聚合物全息存储材料、制备方法及应用。
背景技术
全息存储是一种基于光全息术的信息存储技术,它可以将二维数据页以体全息图的形式存储于三维介质中,具有高存储密度、大容量、长寿命、高传输速率等优点,在大数据存储、云计算、人工智能等领域具有重要的应用价值。全息存储中可以通过改变全息记录时物光和参考光的角度、波长、相位和偏振等参数,通过复用技术在全息存储材料的同一位置记录多幅全息图,从而显著提高全息存储材料的存储密度及存储容量。光致聚合物是目前受到广泛关注和研究的一类全息记录及存储材料,在全息曝光过程中由于单体聚合时引起的体积收缩效应会导致全息图的读出角度偏离原记录时的布拉格条件,导致全息页面的再现光强下降或完全无法读出。目前一般通过在光致聚合物体系中添加TiO2、SiO2、Fe3O4等无机纳米颗粒来改善全息记录时的体积收缩率,但这类体系存在如下缺陷,例如:无机材料在有机光致聚合物体系中的相容性及分散性能较差,易团聚或沉淀,添加低浓度的无机纳米颗粒无法有效降低体积收缩率,提高无机纳米颗粒浓度时会明显增加全息记录光场的散射,导致全息图衍射效率下降、影响全息存储质量及存储密度。
发明内容
针对上述问题,本发明提供一种含POSS纳米材料的光致聚合物全息存储材料、制备方法及应用。
本发明采用下述的技术方案:
一种含POSS纳米材料的光致聚合物全息存储材料,按照质量分数计包括以下组分:25~50份的成膜剂,5~25份的单体丙烯酰胺,1~10份的亚甲基双丙烯酰胺,0.1~1份的多面体齐聚倍半硅氧烷POSS,0.01~0.1份的光敏剂,1~10份的单体丙烯酸,0.1~2份的三乙醇胺。
进一步的,所述成膜剂为聚乙烯醇、明胶中任一种。
进一步的,所述光敏剂为曙红Y、亚甲基蓝中任一种或两种。
进一步的,所述POSS含不同R基团,如下式所述
其中8个R基团可以为环氧基、氨基、羧基、烯基、烷基、羟基、芳基任一种或不同种类的组合。
本发明的另一方面提供一种含POSS纳米材料的光致聚合物全息存储材料的制备方法,包括如下步骤:
步骤1:加热制备成膜剂溶液;
步骤2:分别向成膜剂溶液中加入丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、POSS,在安全灯下添加光敏剂,使各组分混合均匀得混合溶液;
步骤3:量取步骤2混合溶液涂布于水平放置的光学玻璃板上,置于暗室中干燥制得薄膜态的含POSS纳米材料的全息存储材料。
进一步的,所述步骤1,加热温度为70℃。
进一步的,所述暗室温度20~25℃、湿度50%~70%。
进一步的,所述薄膜厚度为30~500μm。
本发明的另一方面提供一种含POSS纳米材料的光致聚合物全息存储材料在全息存储中的应用。
本发明的有益效果是:
本发明将包含有机-无机杂化分子的POSS纳米颗粒掺杂到聚乙烯醇/丙烯酰胺光致聚合物体系中,通过POSS浓度优化,可将材料体系的体积收缩率由原来的1.1~1.5%降低到0.2~0.4%,同时保持原材料体系的高衍射效率、高感光灵敏度、高空间分辨率等性能指标,这是由于POSS材料在光致聚合物体系中的相容性及分散性明显优于无机纳米颗粒,其立体框架结构可有效降低单体光致聚合时引起的体积收缩,同时POSS材料的折射率大于周围的成膜剂聚乙烯醇,最终在亮曝光区由单体聚合形成的聚合物及迁移到亮区的更高浓度的POSS材料的双重作用使得亮曝光区的总折射率大于暗曝光区,提高了全息图的衍射效率。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例的附图作简单地介绍,显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例,而非对本发明的限制。
图1为本发明实施例1、2与对照例记录的全息图衍射效率与曝光量的关系曲线示意图;
图2为本发明实施例1、2与对照例全息图衍射效率与布拉格偏移角度的关系曲线示意图。
图3为含POSS纳米材料的光致聚合物全息存储材料的光致聚合过程示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例的附图,对本发明实施例的技术方案进行清楚、完整地描述。显然,所描述的实施例是本发明的一部分实施例,而不是全部的实施例。基于所描述的本发明的实施例,本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
步骤1:70℃下加热制备5%浓度的聚乙烯醇水溶液,
步骤2:分别向其中加入一定质量或体积的丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS,最后在安全灯下添加一定质量的曙红Y,并通过磁力搅拌或超声震荡使各组分混合均匀,所加聚乙烯醇、丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS、曙红Y的质量比分别为50:24:4.5:20:0.2:0.2:0.03;
步骤3:量取一定体积的混合溶液涂布在严格水平放置的光学玻璃板上,置于温度25℃、湿度70%的暗室中干燥两天制成厚度约300μm的干膜备用。
实施例2
步骤1:70℃下加热制备5%浓度的聚乙烯醇水溶液;
步骤2:分别向其中加入一定质量或体积的丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS,最后在安全灯下添加一定质量的曙红Y,并通过磁力搅拌或超声震荡使各组分混合均匀,所加聚乙烯醇、丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS、曙红Y的质量比分别为50:24:4.5:20:0.2:0.4:0.03;
步骤3:量取一定体积的混合溶液涂布在严格水平放置的光学玻璃板上,置于温度25℃、湿度70%的暗室中干燥两天制成厚度约300μm的干膜备用。
实施例3
步骤1:70℃下加热制备5%浓度的聚乙烯醇水溶液;
步骤2:分别向其中加入一定质量或体积的丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS,最后在安全灯下添加一定质量的曙红Y,并通过磁力搅拌或超声震荡使各组分混合均匀,所加聚乙烯醇、丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS、曙红Y的质量比分别为50:24:4.5:20:0.2:1:0.03;
步骤3:量取一定体积的混合溶液涂布在严格水平放置的光学玻璃板上,置于温度25℃、湿度70%的暗室中干燥两天制成厚度约300μm的干膜备用。
实施例4
步骤1:70℃下加热制备5%浓度的聚乙烯醇水溶液;
步骤2:分别向其中加入一定质量或体积的丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS,最后在安全灯下添加一定质量的曙红Y,并通过磁力搅拌或超声震荡使各组分混合均匀,所加聚乙烯醇、丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、八苯基-POSS、曙红Y的质量比分别为50:24:4.5:20:0.2:0.1:0.03;
步骤3:量取一定体积的混合溶液涂布在严格水平放置的光学玻璃板上,置于温度25℃、湿度70%的暗室中干燥两天制成厚度约300μm的干膜备用。
对比例
步骤1:70℃下加热制备5%浓度的聚乙烯醇水溶液;
步骤2:分别向其中加入一定质量或体积的丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺,最后在安全灯下添加一定质量的曙红Y,并通过磁力搅拌或超声震荡使各组分混合均匀,所加聚乙烯醇、丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、曙红Y的质量比分别为50:24:4.5:20:0.2:0.03,本配放与前述实施例1~4的主要区别是不含八苯基-POSS;
步骤3:量取一定体积的混合溶液涂布在严格水平放置的光学玻璃板上,置于温度25℃、湿度70%的暗室中干燥两天制成厚度约300μm的干膜备用。
如图1、图2及表1的实验结果可知,掺杂质量份数为0.2份的八苯基-POSS(实施例1)可以将最大衍射效率从对比例(不含POSS纳米材料)的86%提高到90%,体积收缩率从对比例的1.11%明显降低到0.41%。而掺杂更高浓度(质量份数为0.4份)的八苯基-POSS(实施例2)尽管最大衍射效率从对照例的86%下降到72%,但体积收缩率从对照例的1.11%显著降低到0.17%。
表1实施例1、2及对照例的主要全息记录性能指标对比
对照例 | 实施例1 | 实施例2 | |
全息图的最大衍射效率 | 86% | 90% | 72% |
感光灵敏度 | 0.17cm/mJ | 0.17cm/mJ | 0.21cm/mJ |
布拉格偏移角度 | 0.19° | 0.07° | 0.03° |
对应的体积收缩率 | 1.11% | 0.41% | 0.17% |
光致聚合物通常由可聚合单体、光敏剂、光引发剂、成膜剂及其他助剂构成,其光致聚合过程如图3所示。在入射单色激光的照射下,光敏剂曙红Y分子吸收特定能量的光子,由基态跃迁到激发态,激发态的光敏剂分子与光引发剂三乙醇胺发生反应生成光引发剂自由基,然后由光引发剂自由基引发丙烯酰胺、亚甲基双丙烯酰胺及丙烯酸等可聚合单体发生链式聚合反应形成光致聚合物。POSS材料在光致聚合物体系中有良好的相容性及分散性,其立体框架结构可有效降低单体光致聚合时引起的体积收缩,同时光致聚合过程中使亮曝光区的单体浓度变小,形成的浓度梯度导致暗曝光区的单体及POSS纳米材料向亮曝光区迁移,导致亮曝光区有更多的单体聚合形成聚合物。由于POSS的折射率大于周围的成膜剂聚乙烯醇,最终在亮曝光区由单体聚合形成的聚合物及迁移到亮区的更高浓度的POSS材料的双重作用使得亮曝光区的总折射率大于暗曝光区,从而形成高衍射效率的位相型全息图。
因此在聚乙烯醇/丙烯酰胺光致聚合物体系中掺杂合适浓度的POSS纳米材料不但可以显著改善材料的体积收缩率,同时也可保持原材料体系的高衍射效率、高感光灵敏度、高空间分辨率等性能指标,在全息显示、全息存储、干涉计量等领域具有良好的应用价值。
以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,但凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所做的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的保护范围内。
Claims (9)
1.一种含POSS纳米材料的光致聚合物全息存储材料,其特征在于,按照质量份数计包括以下组分:25~50份的成膜剂,5~25份的单体丙烯酰胺,1~10份的亚甲基双丙烯酰胺,0.1~1份的多面体齐聚倍半硅氧烷POSS,0.01~0.1份的光敏剂,1~10份的单体丙烯酸,0.1~2份的三乙醇胺。
2.根据权利要求1所述一种含POSS纳米材料的光致聚合物全息存储材料,其特征在于,所述成膜剂为聚乙烯醇、明胶中任一种。
3.根据权利要求1所述一种含POSS纳米材料的光致聚合物全息存储材料,其特征在于,所述光敏剂为曙红Y、亚甲基蓝中任一种或两种。
4.根据权利要求1所述一种含POSS纳米材料的光致聚合物全息存储材料,其特征在于,所述POSS含不同R基团,如下式所述
其中8个R基团可以为环氧基、氨基、羧基、烯基、烷基、羟基、芳基任一种或不同种类的组合。
5.一种含POSS纳米材料的光致聚合物全息存储材料的制备方法,其特征在于,包括如下步骤:
步骤1:加热制备成膜剂溶液;
步骤2:分别向成膜剂溶液中加入丙烯酰胺、亚甲基双丙烯酰胺、丙烯酸、三乙醇胺、POSS,在安全灯下添加光敏剂,使各组分混合均匀得混合溶液;
步骤3:量取步骤2混合溶液涂布于水平放置的光学玻璃板上,置于暗室中干燥制得薄膜态的含POSS纳米材料的全息存储材料。
6.根据权利要求5所述一种含POSS纳米材料的光致聚合物全息存储材料的制备方法,其特征在于,所述步骤1,加热温度为70℃。
7.根据权利要求5所述一种含POSS纳米材料的光致聚合物全息存储材料的制备方法,其特征在于,所述暗室温度20~25℃、湿度50%~70%。
8.根据权利要求5所述一种含POSS纳米材料的光致聚合物全息存储材料的制备方法,其特征在于,所述薄膜厚度为30~500μm。
9.一种含POSS纳米材料的光致聚合物全息存储材料在全息存储中的应用。
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