公开(公告)号：US20210163702A1

公开(公告)日：2021-06-03

申请号：US17155188

申请日：2021-01-22

申请人： Derek J. Dehn ,  Bharat R. Acharya ,  Brandon A. Bartling ,  Paul T. Hines ,  Clinton P. Waller, JR. ,  Satinder K. Nayar

发明人： Derek J. Dehn ,  Bharat R. Acharya ,  Brandon A. Bartling ,  Paul T. Hines ,  Clinton P. Waller, JR. ,  Satinder K. Nayar

IPC分类号： C08J9/00 ,  C08J3/14 ,  C08J3/21 ,  C08J3/20 ,  C08L101/14 ,  C08K3/22 ,  C08K3/34 ,  C08K3/04

摘要： Polymer matrix composite comprising a porous polymeric network; and a plurality of intumescent particles distributed within the polymeric network structure; wherein the intumescent particles are present in a range from 15 to 99 weight percent, based on the total weight of the intumescent particles and the polymer (excluding the solvent); and wherein the polymer matrix composite volumetrically expands at least 2 times its initial volume when exposed to at least one temperature greater than 135° C.; and methods for making the same. The polymer matrix composites are useful, for example, as fillers, thermally initiated fuses, and fire stop devices.

公开(公告)号：US06895688B2

公开(公告)日：2005-05-24

申请号：US10651689

申请日：2003-08-29

申请人： Bharat R. Acharya ,  Cheng Cher Huang ,  Christi Kay Madsen ,  John A. Rogers

发明人： Bharat R. Acharya ,  Cheng Cher Huang ,  Christi Kay Madsen ,  John A. Rogers

IPC分类号： G02F1/01 ,  F26B3/34

CPC分类号： G02F1/0136 ,  G02F1/134363

摘要： A liquid crystal polarization rotator device is able to rotate polarization fast enough to compensate polarization mode dispersion. The amount or degree of rotation is rapidly reconfigurable. The device includes a cavity filled with a nematic liquid crystal material. The cavity has electrodes on a first face, e.g., a first substrate, and electrodes on a second face, e.g., a second substrate, opposite the first face. The electrodes are shaped and positioned to produce an electric field across the cavity capable of rotating the alignment direction of the molecules of the liquid crystal material in the cavity. The electrodes are patterned on the ends of optical fibers. Aligning and positioning of the electrodes on the ends of the optical fibers with a predetermined spacing forms the cavity that is filled with the nematic liquid crystal material. The filled cavity is a so-called liquid crystal microcell wave plate. A control system is used to control the “rapid” rotation of the alignment direction of the molecules of the liquid crystal material. The control system receives data regarding the polarization of light entering or leaving the microcell and adjusts the direction of the electric field also using trigger pulses such as to rotate the nematic liquid crystal material molecules by a first predetermined number of degrees greater than a second desired number of degrees of rotation. Then, the trigger pulses for the electric field are stopped after the molecules have rotated by the second desired number of degrees. In this manner, the molecules rotate by the second desired number of degrees much faster than if a pulse had been applied with the same speed to rotate them by the second desired number of degrees in he first place.

摘要翻译： 液晶偏振旋转器能够快速旋转极化，以补偿偏振模色散。 旋转量或速度可以快速重构。 该装置包括填充向列型液晶材料的空腔。 空腔在第一面上具有电极，例如第一基底，以及与第一面相对的第二面，例如第二基底上的电极。 电极被成形和定位以产生能够旋转空腔中的液晶材料的分子的取向方向的空腔的电场。 电极在光纤的端部被图案化。 电极在光纤端部上以预定间隔的对准和定位形成填充向列型液晶材料的空腔。 填充腔是所谓的液晶微电池波片。 控制系统用于控制液晶材料分子的取向方向的“快速”旋转。 控制系统接收关于进入或离开微电池的光的偏振的数据，并且还使用触发脉冲调节电场的方向，例如使向列型液晶材料分子旋转大于第二所需数量的第一预定数量 的旋转度。 然后，在分子旋转了第二所需数量的度之后，停止用于电场的触发脉冲。 以这种方式，分子以比第一位置以相同速度施加脉冲旋转第二所需数量的速度快得多的第二所需数量的速度快得多。