CN110494456B - 感光聚合物组合物 - Google Patents
感光聚合物组合物 Download PDFInfo
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- CN110494456B CN110494456B CN201880021553.1A CN201880021553A CN110494456B CN 110494456 B CN110494456 B CN 110494456B CN 201880021553 A CN201880021553 A CN 201880021553A CN 110494456 B CN110494456 B CN 110494456B
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Abstract
本公开涉及一种感光聚合物组合物,包含:聚合物基质或其前体;光反应性单体,该光反应性单体包含折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体;以及光引发剂,其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为60重量%以上。本公开还涉及一种由所述感光聚合物组合物制备的全息图记录介质、包括所述全息图记录介质的光学元件,以及使用所述感光聚合物组合物的全息记录方法。
Description
技术领域
相关申请的交叉引用
本申请要求于2017年4月25日在韩国知识产权局提交的韩国专利申请No.10-2017-0053106的权益,该申请的公开内容通过引用全部并入本说明书中。
本公开涉及一种感光聚合物组合物、全息图记录介质、光学元件和全息记录方法。
背景技术
全息图记录介质通过曝光处理改变介质中全息记录层的折射率来记录信息,读取所记录的介质中的折射率的变化,并且再现该信息。
当使用感光聚合物(光敏树脂)时,光干涉图案通过低分子量单体的光聚合反应可以容易地存储为全息图。因此,感光聚合物可以用于各种领域中,如用于光学透镜、反光镜、偏转镜、滤光片、漫射屏、衍射元件、光导、波导、具有投影屏和/或掩模功能的全息光学元件、光学存储器系统和光漫射板的介质、光学波长多工器、反射型和透射型滤色器等。
通常,用于全息图制备的感光聚合物组合物包含聚合物粘合剂、单体和光引发剂,并且用激光干涉光照射由这种组合物制备的光敏膜来诱导局部单体的光聚合反应。
在这种光聚合反应过程中存在较大量的单体的部分中,折射率变高。此外,在存在较大量的聚合物粘合剂的部分中,折射率相对降低,因此,发生折射率调制,并且通过这种折射率调制产生衍射光栅。折射率调制值(△n)受感光聚合物层的厚度和衍射效率(DE)的影响,并且随着厚度减小,角度选择性增加。
近来,需要开发能够以高衍射效率保持稳定的全息图的材料,并且已经进行各种尝试来制备具有薄的厚度和高折射率调制值的感光聚合物层。
发明内容
技术问题
本公开提供一种感光聚合物组合物,该感光聚合物组合物可以更容易地提供即使以薄的厚度也具有高折射率调制值的感光聚合物层。
本公开还提供一种全息图记录介质,包括即使以薄的厚度也具有高折射率调制值的感光聚合物层。
本公开还提供一种包括上述全息图记录介质的光学元件。
本公开还提供一种全息记录方法,包括使用电磁辐射选择性地使感光聚合物组合物中含有的光反应性单体聚合。
技术方案
本公开提供一种感光聚合物组合物,包含:聚合物基质或其前体;光反应性单体,该光反应性单体包含折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体;以及光引发剂,其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为60重量%以上。
本公开还提供一种由所述感光聚合物组合物制备的全息图记录介质。
另外,本公开提供一种包括所述全息图记录介质的光学元件。
本公开还提供一种全息记录方法,包括使用电磁辐射选择性地使所述感光聚合物组合物中含有的光反应性单体聚合。
下文中,将更详细地描述根据本发明的具体实施方案的感光聚合物组合物、全息图记录介质、光学元件和全息记录方法。
如本文所使用,术语“(甲基)丙烯酸酯”指甲基丙烯酸酯或丙烯酸酯。
另外,本文所使用的术语“全息图”指通过曝光处理在整个可见光范围和近紫外范围(300nm至800nm)中记录光学信息的记录介质,并且其实例包括所有的可视全息图,如同轴(Gabor)全息图、离轴全息图、全孔径转移全息图、白光透射全息图(“彩虹全息图”)、Denisyuk全息图、离轴反射全息图、边缘照明全息图和全息立体图。
根据本公开的一个实施方案,提供一种感光聚合物组合物,包含:聚合物基质或其前体;光反应性单体,该光反应性单体包含折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体;以及光引发剂,其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为60重量%以上。
本发明人通过实验发现,与现有的全息图相比,通过使用具有相对低的折射率并且在室温下具有低粘度的多官能记录单体和具有相对高的折射率的单官能记录单体且单官能单体在预定量以上制备的全息图即使以薄的厚度也可以表现出显著提高的折射率调制值,从而完成本发明。
更具体地,所述感光聚合物组合物包含光反应性单体,该光反应性单体包含折射率为1.5以下并且在25℃下的粘度为100cps以下或90cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体,并且所述折射率为1.5以上的所述单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为60重量%以上或65重量%以上。因此,由所述感光聚合物组合物制备的全息图即使以5μm至30μm的厚度也可以表现出0.01以上或0.0120以上的折射率调制值(△n)。
具体地,所述感光聚合物组合物包含在25℃下的粘度为100cps以下或90cps以下的多官能(甲基)丙烯酸酯单体,并且该多官能丙烯酸酯可以增加交联点以补偿为提高折射率而使用的单官能(甲基)丙烯酸酯的低交联密度。
所述感光聚合物组合物包含在光反应性单体中60重量%以上、65重量%以上或70重量%至90重量%的具有相对高折射率的单官能(甲基)丙烯酸酯单体,从而增加了相对于粘合剂的折射率的差异。因此,如上所述,由所述感光聚合物组合物制备的全息图即使以5μm至30μm的厚度也可以得到0.0100以上或0.0120以上的折射率调制值(△n)。
同时,与多官能(甲基)丙烯酸酯单体相比,折射率为1.5以上的单官能(甲基)丙烯酸酯单体可以具有相对高的粘度。具体地,折射率为1.5以上的单官能(甲基)丙烯酸酯单体在25℃下的粘度可以为300cps以下或为100cps至300cps。
作为所述光反应性单体,可以使用(甲基)丙烯酸酯类α,β-不饱和羧酸衍生物,如(甲基)丙烯酸酯、(甲基)丙烯酰胺、(甲基)丙烯腈或(甲基)丙烯酸。
更具体地,折射率为1.5以下并且在25℃下的粘度为100cps以下或90cps以下的多官能(甲基)丙烯酸酯单体可以在分子中包含醚键和芴官能团。折射率为1.5以下并且在25℃下粘度为100cps以下或90cps以下的多官能(甲基)丙烯酸酯单体的具体实例包括聚乙二醇二(甲基)丙烯酸酯、三甲基丙烷(环氧乙烷)三(甲基)丙烯酸酯等。
另外,折射率为1.5以上的单官能(甲基)丙烯酸酯单体可以在分子中包含醚键和芴官能团。折射率为1.5以上的单官能(甲基)丙烯酸酯单体的具体实例包括(甲基)丙烯酸苯氧基苄基酯、(甲基)丙烯酸邻苯基苯酚环氧乙烷酯、(甲基)丙烯酸苄酯、(甲基)丙烯酸2-(苯硫基)乙酯、(甲基)丙烯酸联苯甲酯等。
折射率为1.5以下并且在25℃下的粘度为100cps以下或90cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体各自的重均分子量可以为50g/mol至1000g/mol或200g/mol至600g/mol。重均分子量指通过GPC方法测量的使用聚苯乙烯校准的重均分子量。
所述多官能(甲基)丙烯酸酯单体和所述单官能(甲基)丙烯酸酯单体的玻璃化转变温度可以通过差示扫描量热法或通过公知方法测量。
所述聚合物基质可以充当所述感光聚合物组合物和由其制备的最终产品如膜的载体,并且由于折射率的差异,可以增加由所述感光聚合物组合物制备的全息图的折射率调制。
所述聚合物基质可以是具有至少一个异氰酸酯基的化合物与多元醇的反应产物。
所述具有至少一个异氰酸酯基的化合物可以是平均每分子具有至少一个NCO官能团的已知化合物,或其混合物,并且可以是具有至少一个异氰酸酯基的化合物。
更具体地,所述具有至少一个异氰酸酯基的化合物是脂肪族、脂环族、芳香族或芳香族-脂肪族的单-、二、三或多异氰酸酯。所述具有至少一个异氰酸酯基的化合物可以是具有氨基甲酸酯、脲、碳二亚胺、酰基脲、异氰脲酸酯、脲基甲酸酯、缩二脲、噁二嗪三酮、异氰酸酯二聚体或亚氨基噁二嗪二酮结构的单体型二异氰酸酯和/或三异氰酸酯的具有相对高分子量的二级产物(低聚异氰酸酯和多异氰酸酯)。
所述具有至少一个异氰酸酯基的化合物的具体实例包括:丁烯二异氰酸酯、六亚甲基二异氰酸酯(HDI)、异佛尔酮二异氰酸酯(IPDI)、1,8-二异氰酸基-4-(异氰酸基甲基)辛烷、2,2,4-和/或2,4,4-三甲基六亚甲基二异氰酸酯、异构双(4,4'-异氰酸基-环己基)甲烷、它们的具有任意所需要的异构体含量的混合物、异氰酸基甲基-1,8-辛烷二异氰酸酯、1,4-亚环己基二异氰酸酯、异构环己烷二亚甲基二异氰酸酯、1,4-亚苯基二异氰酸酯、2,4-和/或2,6-甲苯二异氰酸酯、1,5-亚萘基二异氰酸酯、2,4'-或4,4'-二苯基甲烷二异氰酸酯和/或三苯甲烷4,4',4”-三异氰酸酯等。
与所述具有至少一个异氰酸酯基的化合物反应以形成聚合物基质的多元醇可以是具有2至20个碳原子的脂肪族、芳香族-脂肪族或脂环族的二元醇、三元醇和/或更高级多元醇。
所述多元醇的羟基当量可以为300g/mol至10,000g/mol,重均分子量可以为100,000g/mol至1,500,0000g/mol。
所述二元醇的实例包括:乙二醇、二甘醇、三甘醇、四甘醇、二丙二醇、三丙二醇、1,2-丙二醇、1,3-丙二醇、1,4-丁二醇、新戊二醇、2-乙基-2-丁基丙二醇、三甲基戊二醇、二乙基辛二醇的位置异构体、1,3-丁二醇、环己二醇、1,4-环己烷-二甲醇、1,6-己二醇、1,2-和1,4-环己二醇、氢化双酚A(2,2-双(4-羟基环己基)丙烷)以及2,2-二甲基-3-羟基丙基二醇和2,2-二甲基-3-羟基丙酸酯。
另外,所述三元醇的实例包括三羟甲基乙烷、三羟甲基丙烷和甘油。合适的高官能醇包括二三羟甲基丙烷、季戊四醇、二季戊四醇和山梨糖醇。
作为所述多元醇,可以使用具有相对大的分子量的脂肪族和脂环族多元醇,如聚酯多元醇、聚醚多元醇、聚碳酸酯多元醇、羟基官能丙烯酸树脂、羟基官能聚氨酯、羟基官能环氧树脂等。
所述聚酯多元醇可以是直链聚酯二元醇,该直链聚酯二元醇通过使用多元醇如乙二醇、二-、三-或四甘醇、1,2-丙二醇、二-、三-或四丙二醇、1,3-丙二醇、1,4-丁二醇、1,3-丁二醇、2,3-丁二醇、1,5-戊二醇、1,6-己二醇、2,2-二甲基-1,3-丙二醇、1,4-二羟基环己烷、1,4-二羟甲基环己烷、1,8-辛二醇、1,10-癸二醇、1,12-十二烷二醇或它们的混合物,并且任选地,同时使用更高官能的多元醇如三羟甲基丙烷或甘油,以已知方式由脂肪族、脂环族或芳香族二羧酸或多羧酸或它们的酸酐,例如,琥珀酸、戊二酸、己二酸、庚二酸、辛二酸、壬二酸、癸二酸、壬烷二甲酸、癸烷二甲酸、对苯二甲酸、间苯二甲酸、邻苯二甲酸、四氢邻苯二甲酸、六氢邻苯二甲酸或偏苯三酸,以及酸酐如邻苯二甲酸酐、偏苯三酸酐或琥珀酸酐,或它们的任意混合物而得到。当然,环状脂肪族和/或芳香族的二-和多羟基化合物适合作为用于制备聚酯多元醇的多元醇。在聚酯的制备中,也可以使用低级醇的相应的多元羧酸酐或相应的多羧酸酯或它们的混合物代替游离的多元羧酸。
另外,可以用于合成聚合物基质的聚酯多元醇包括内酯的均聚物或共聚物,它们优选通过将内酯或内酯混合物,如丁内酯、ε-己内酯和/或甲基-ε-己内酯添加到作为聚酯多元醇的合成成分的合适的双官能和/或更高官能的引发剂分子,如上述具有小分子量的多元醇中来得到。
另外,具有羟基的聚碳酸酯也适合作为用于预聚物合成的多羟基成分。例如,它可以通过二元醇如1,4-丁二醇和/或1,6-己二醇和/或3-甲基戊二醇与碳酸二芳基酯如碳酸二苯酯、碳酸二甲酯或光气的反应来制备。
另外,可以用于合成聚合物基质的聚醚多元醇可以是,例如,苯乙烯氧化物、环氧乙烷、环氧丙烷、四氢呋喃、环氧丁烷或环氧氯丙烷的加聚产物、它们的混合加成产物、它们的接枝产物、通过多元醇缩合得到的聚醚多元醇或其混合物,以及通过多元醇、胺和氨基醇的烷氧基化得到的聚醚多元醇。聚醚多元醇的具体实例包括:无规或嵌段共聚物形式的聚(环氧丙烷)、聚(环氧乙烷)和它们的组合,或者OH官能度为1.5至6并且数均分子量为200g/mol至18,000g/mol,优选OH官能度为1.8至4.0并且数均分子量为600g/mol至8000g/mol,特别优选OH官能度为1.9至3.1并且数均分子量为650g/mol至4500g/mol的聚(四氢呋喃)及其混合物。
同时,实施方案的感光聚合物组合物包含光引发剂。光引发剂是通过光或光化辐射活化的化合物,并且引发含有光反应性官能团的化合物如光反应性单体的聚合。
作为所述光引发剂,可以使用公知的光引发剂而没有特别地限制。例如,可以使用单分子(I型)引发剂或双分子(II型)引发剂。
用于自由基光聚合的(I型)体系可以包括,例如,与叔胺组合的芳香族酮化合物,如二苯甲酮、烷基二苯甲酮、4,4'-双(二甲基氨基)二苯甲酮(米氏酮)、蒽酮和卤代二苯甲酮,或这些类型的混合物。引发剂(II型)如苯偶姻及其衍生物、苄基缩酮、酰基氧化膦,例如,2,4,6-三甲基苯甲酰基二苯基氧化膦、双酰基氧化膦,苯基乙醛酰基酯、樟脑醌、α-氨基烷基苯酮、α,α-二烷氧基苯乙酮、1-[4-(苯硫基)苯基]辛烷-1,2-二酮2-(O-苯甲酰基肟)和α-羟烷基酰苯也适合。由芳基硼酸铵和一种或多种染料的混合物组成的光引发剂体系也可以用作光引发剂。
所述感光聚合物组合物可以包含:20重量%至80重量%的聚合物基质或其前体;10重量%至70重量%的光反应性单体;和0.1重量%至15重量%的光引发剂,或者可以包含:30重量%至70重量%的聚合物基质或其前体;20重量%至60重量%的光反应性单体;和0.1重量%至10重量%的光引发剂。
所述感光聚合物组合物还可以包含其它添加剂、催化剂等。例如,所述感光聚合物组合物还可以包含通常已知用于促进聚合物基质或光反应性单体聚合的催化剂。所述催化剂的实例包括:辛酸锡、辛酸锌、二月桂酸二丁基锡、二甲基双[(1-氧代新癸基)氧基]锡烷、二甲酸二甲基锡、二(乙基己酸)锆、乙酰丙酮锆,或叔胺如1,4-二氮杂双环[2.2.2]辛烷、二氮杂双环壬烷、二氮杂双环十一烷、1,1,3,3-四甲基胍、1,3,4,6,7,8-六氢-1-甲基-2H-嘧啶并(1,2-a)嘧啶等。
同时,根据本公开的另一实施方案,可以提供由所述感光聚合物组合物制备的全息图记录介质。
如上所述,与现有技术中已知的全息图相比,当使用一个实施方案的感光聚合物组合物时,可以提供能够得到显著提高的折射率调制值同时具有更薄的厚度的全息图。
在一个实施方案的感光聚合物组合物中,将其中包含的各个成分均匀混合、干燥并且在20℃以上的温度下固化,然后进行预定的曝光程序,从而制备用于整个可见光范围和近紫外区域(300nm至800nm)的光学应用的全息图。
在一个实施方案的感光聚合物组合物中,可以首先均匀混合除了用于形成聚合物基质或其前体的具有至少一个异氰酸酯基的化合物之外的其它成分,然后可以将所述具有至少一个异氰酸酯基的化合物与催化剂混合来制备全息图。
在一个实施方案的感光聚合物组合物中,可以使用本领域中常用的混合装置、搅拌器、混合器等来混合其中包含的各个成分而没有特别地限制。混合过程中的温度可以是0℃至100℃,优选为10℃至80℃,特别优选为20℃至60℃。
同时,在一个实施方案的感光聚合物组合物中,可以首先均匀混合除了用于形成聚合物基质或其前体的具有至少一个异氰酸酯基的化合物之外的其它成分。随后,在添加所述具有至少一个异氰酸酯基的化合物时,所述感光聚合物组合物可以成为在20℃以上的温度下固化的液体制剂。
固化温度可以根据感光聚合物的组成而变化,并且通过,例如,在30℃至180℃,优选地为40℃至120℃,更优选地为50℃至100℃的温度下加热来促进固化。
在固化时,感光聚合物可以为注入或涂布在预定基板或模具上的状态。
同时,作为在由所述感光聚合物组合物制备的全息图记录介质上记录可视全息图的方法,可以使用公知的方法而没有特别地限制。可以采用在下文中描述的实施方案的全息记录方法中描述的方法作为一个实例。
根据本公开的另一实施方案,可以提供全息记录方法,该全息记录方法包括使用电磁辐射选择性地使所述感光聚合物组合物中含有的光反应性单体聚合。
如上所述,通过混合和固化所述感光聚合物组合物的工艺,可以制备未记录可视全息图的介质,并且可以通过预定的曝光过程在介质上记录可视全息图。
可以使用已知的装置和方法在公知的条件下,在通过混合和固化所述感光聚合物组合物的工艺而提供的介质上记录可视全息图。
根据本公开的另一实施方案,可以提供包括所述全息图记录介质的光学元件。
所述光学元件的具体实例包括:光学透镜、反光镜、偏转镜、滤光片、漫射屏、衍射元件、光导、波导、具有投影屏和/或掩模功能的全息光学元件、光学存储器系统和光漫射板的介质、光学波长多工器、反射型和透射型滤色器等。
所述包括全息图记录介质的光学元件的一个实例可以包括全息图显示装置。
全息图显示装置包括光源单元、输入单元、光学系统和显示单元。光源单元是照射用于在输入单元和显示单元中提供、记录和再现目标的三维图像信息的激光束的部分。此外,输入单元是预先输入待记录在显示单元上的目标的三维图像信息的部分,例如,目标的三维信息如用于各个空间的光的强度和相位可以输入到电寻址液晶SLM中,其中可以使用输入光束(212)。光学系统可以包括反光镜、偏振器、分束器、射束光闸、透镜等。光学系统可以分为用于将从光源单元发射的激光束发送至输入单元的输入光束、用于将激光束发送至显示单元的记录光束、参照光束、擦除光束、读取光束等。
显示单元可以接收来自输入单元的目标的三维图像信息,将其记录在由光寻址SLM组成的全息图板上,并且再现目标的三维图像。此处,可以通过输入光束和参照光束的干涉来记录目标的三维图像信息。记录在全息图板上的目标的三维图像信息可以通过由读取光束产生的衍射图案再现为三维图像。擦除光束可以用于迅速移除所形成的衍射图案。同时,全息图板可以在三维图像输入的位置与三维图像再现的位置之间移动。
有益效果
根据本公开,提供一种可以更容易地提供即使以薄的厚度也具有高折射率调制值的感光聚合物层的感光聚合物组合物、包括即使以薄的厚度也具有高折射率调制值的感光聚合物层的全息图记录介质、包括所述全息图记录介质的光学元件,以及包括使用电磁辐射选择性地使所述感光聚合物组合物中含有的光反应性单体聚合的全息记录方法。
具体实施方式
下文中,将参照下面实施例详细地说明本发明。然而,这些实施例仅用于说明本发明,并且本发明的范围不限于此。
[制备实施例:多元醇的合成]
将34.5g的丙烯酸甲酯、57.5g的丙烯酸丁酯和8g的丙烯酸4-羟基丁酯放置在2L的夹套反应器中并且用150g的乙酸乙酯稀释。继续搅拌约1小时,同时保持夹套反应器的温度为60℃至70℃。然后,将0.035g的正十二烷基硫醇进一步添加到反应器中,接着进一步搅拌约30分钟。之后,向其中添加0.04g的作为聚合引发剂的AIBN(2,2'-偶氮-二异丁腈),并且在约70℃的温度下继续聚合约4小时直至残留的丙烯酸酯类单体含量变为1重量%,来合成多元醇。得到的多元醇通过GPC测量的使用聚苯乙烯校准的重均分子量为约700,000,并且通过KOH滴定法测得的OH当量为1802g/OH mol。
[实施例和比较例:感光聚合物组合物的制备]
将39.44g的制备实施例的多元醇、31.33g的表1至表2中所示的单体、0.06g的safraninO(染料,由Sigma-Aldrich制造)、2.01g的N-甲基二乙醇胺(由Sigma-Aldrich制造)、4.19g的[4-甲基苯基-(4-(2-甲基丙基)苯基)]碘鎓六氟磷酸盐(Irgacure 250)和0.42g的BYK-310(分散剂)避光混合,并且用糊料搅拌器搅拌约2分钟,得到透明涂布溶液。
将7.56g的MFA-75X(六官能异氰酸酯,在二甲苯中稀释至75重量%,由AsahiKasei制造)添加到所述涂布溶液中并且进一步搅拌约1分钟。向其中添加作为催化剂的DBTDL(相对于合成的聚氨酯树脂为0.05重量%)并且搅拌约1分钟。使用Mayer棒将其涂布在PC基板(125μm)上至厚度为18μm,然后在80℃下固化30分钟。之后,将样品在约25℃和50%RH的恒定温度和湿度条件下在暗室中在静置12小时以上。
[实验例:全息记录]
(1)将在各个实施例和比较例中制备的涂布有感光聚合物的表面层压在载玻片上,并且固定,使得在记录时激光首先通过玻璃表面。
(2)通过两个干涉光(参考光和目标光)的干涉进行全息记录,并且进行透射型记录,使得两个光束入射至样品的同一侧。衍射效率随着两个光束的入射角而变化,并且当两个光束的入射角相同时变为非倾斜。在非倾斜记录中,因为两个光束的入射角等于法线,因此垂直于薄膜产生衍射光栅。
使用波长为532nm的激光以透射型非倾斜方式进行记录(2θ=45°),并且根据下面等式1计算衍射效率(η)。
[等式1]
在等式1中,η是衍射效率,PD是记录后样品的衍射光束的输出量(mW/cm2),PT是记录样品的透射光束的输出量(mW/cm2)。
透射型全息图的无损介质光栅可以根据下面等式2计算折射率调制值(△n)。
[等式2]
在等式2中,d是感光聚合物层的厚度,△n是折射率调制值,η(DE)是衍射效率,λ是记录波长。
[表1]实施例的单/多官能丙烯酸酯单体的类型和折射率调制值的测量结果(△n)
[表2]比较例的单/多官能丙烯酸酯单体的类型和折射率调制值的测量结果(△n)
1)单体的折射率的测量
使用相对于单体分别为0.5重量%和0.2重量%的量的Irgacure 184(UV引发剂,由Ciba制造)和F477(表面活性剂,由DIC制造)来制备涂布溶液。将涂布溶液涂布在玻璃基板上至2μm的厚度,并且在60℃下干燥2分钟。通过以150mJ/cm2照射紫外线固化之后,使用SPA-3DR在632.8nm下测量折射率。
2)单体的玻璃化转变温度(Tg)的测量
使用相对于单体为0.5重量%的量的Irgacure 184(UV引发剂,由Ciba制造)来制备涂布溶液。将涂布溶液涂布在玻璃基板上至10μm的厚度,并且在60℃下干燥2分钟。通过以150mJ/cm2照射紫外线固化之后,将膜剥离,并且使用DSC测量膜的玻璃化转变温度。具体地,当使用DSC时,温度以10℃/min的速率从-100℃升高至200℃,并且以-10℃/min的速率从200℃降低至-100℃。将该过程重复两次,并且在第二加热期间确认玻璃化转变温度。
如上面表1和表2中所示,可以确认,与比较例相比,使用包含折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体和折射率为1.5以上的单官能(甲基)丙烯酸酯单体,其中,所述单官能(甲基)丙烯酸酯单体的含量为60重量%以上的光反应性单体的实施例可以提供即使以薄的厚度也表现出显著提高的折射率调制值的全息图。
Claims (10)
1.一种感光聚合物组合物,包含:
聚合物基质或其前体;
光反应性单体,包含折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体,和折射率为1.5以上的单官能(甲基)丙烯酸酯单体;以及
光引发剂,
其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为60重量%以上,
其中,所述聚合物基质是具有至少一个异氰酸酯基的化合物与多元醇的反应产物,
其中,所述多元醇的羟基当量为300g/mol至10,000g/mol,重均分子量为100,000g/mol至1,500,000g/mol,
其中,所述单体折射率的测量为:使用相对于单体分别为0.5重量%和0.2重量%的量的Irgacure 184,其是由Ciba制造的UV引发剂,和F477,其是由DIC制造的表面活性剂,来制备涂布溶液,将涂布溶液涂布在玻璃基板上至2μm的厚度,并且在60℃下干燥2分钟,通过以150mJ/cm2照射紫外线固化之后,使用SPA-3DR在632.8nm下测量折射率。
2.根据权利要求1所述的感光聚合物组合物,
其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在所述光反应性单体中的含量为70重量%至90重量%。
3.根据权利要求1所述的感光聚合物组合物,
其中,所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体在25℃下的粘度为300cps以下。
4.根据权利要求1所述的感光聚合物组合物,
其中,所述折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体的分子中包含醚键和芴官能团,
所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体的分子中包含醚键和芴官能团。
5.根据权利要求1所述的感光聚合物组合物,
其中,所述折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体和所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体各自的重均分子量为50g/mol至1000g/mol。
6.根据权利要求1所述的感光聚合物组合物,
其中,所述聚合物基质或其前体的折射率高于所述折射率为1.5以下并且在25℃下的粘度为100cps以下的多官能(甲基)丙烯酸酯单体的折射率,并且小于所述折射率为1.5以上的单官能(甲基)丙烯酸酯单体的折射率。
7.根据权利要求1所述的感光聚合物组合物,包含:
20重量%至80重量%的所述聚合物基质或其前体;
10重量%至70重量%的所述光反应性单体;和
0.1重量%至15重量%的所述光引发剂。
8.一种全息图记录介质,该全息图记录介质由权利要求1所述的感光聚合物组合物制备。
9.一种光学元件,包括权利要求8所述的全息图记录介质。
10.一种全息记录方法,包括使用电磁辐射选择性地使权利要求1所述的感光聚合物组合物中含有的光反应性单体聚合。
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