Abstract:
본 발명은 유연성이 향상된 그래디드 인덱스(Graded-Index)형 플라스틱 광섬유 모재 및 광섬유 제조 방법에 관한 것으로, 클래딩에 사용되는 굴절률이 상대적으로 낮은 제 1단량체와, 플라스틱 광섬유에 유연성을 증가시킬 수 있는 첨가제와, 개시제와, 연쇄이동제를 혼합하여 보호층 튜브를 형성하는 단계(S1); 상기 제 1단량체에 개시제와 연쇄이동제를 첨가하여 클래딩을 형성하는 단계(S2); 상기 제 1단량체와 상기 제 1단량체 보다 굴절률이 상대적으로 높은 제 2단량체를 6:4 내지 7:3으로 혼합한 후 상기 보호층 튜브에 투입하여 상온에서 500~5,000rpm으로 회전시켜 상기 보호층을 팽윤시키면서 혼합용액이 보호층 내부로 확산된 후 겔 상을 형성하는 단계(S3); 이를 다시 50~150℃ 온도에서 회전속도 500~5,000rpm으로 회전시키면서 중합시키는 단계(S4); 및 상기 제 1단량체와 상기 제 2단량체의 혼합비를 5:5 내지 0:10의 범위 내에서 제조된 혼합용액을 상기 보호층 튜브에 투입하여 다시 S3 과정과 S4 과정을 반복하되, 상기 제 2단량체를 점차로 증가시켜 팽윤과 확산을 반복하는 단계(S5);를 포함하는 것을 특징으로 한다. 본 제조방법에 의하면 광섬유의 유연성을 향상시켜줌으로써 기존의 플라스틱 광섬유에 비하여 유연성이 향상되고 외압에 의한 충격에 강한 특징이 있다.
Abstract:
본 발명은 불소를 함유한 1,1-비스하이드록시페닐-1-3,5-비스트리플로로메틸페닐-에탄 단량체 및 그의 제조방법 그리고 이 단량체로 중합한 폴리아릴렌에테르 및 그 제조방법에 관한 것으로 단량체는 하기 화학식 1로 표시되며, 폴리아릴렌에테르는 하기 화학식 2로 표시될 수 있다. 본 발명의 폴리아릴렌에테르는 높은 열적 안정성과 낮은 유전상수 및 낮은 광학손실을 가지므로 광소자 및 광학재료로 사용될 수 있다. [화학식1]
[화학식 2]
(식 중, X는 없거나 C=O, S 또는 SO 2 이고, 여기서 n은 중합도로써 1∼100의 자연수이고, 본 발명에서 제공된 Bis-6F를 제외한 다이올(Diol)과 다이헬라이드(Dihalide)의 반복단위는 동일하거나 이종(異種)이어도 좋다.)
Abstract:
본 고안은 흡입부와 평막의 각 부위와의 거리에 관계없이 평막 전체에 고른 흡입압력을 제공하여 막의 각 부위별 정수처리량이 동일해지도록 제어하는 수단이 구비되어 파울링의 정도를 막전체에 고르게 제공하고, 세정주기를 연장시키며, 결과적으로 사용수명을 연장시켜 주는 침지형 평막 모듈에 관한 것이다. 본 고안은 지지체(310)의 양면에 각각 스페이서용 부직포(320)와 평막(330)이 순차적으로 적층되는 침지형 평막 모듈(300)에 있어서, 상기 지지체(310)는, 내부 중앙 부분에 집수관(311)이 형성되고, 상기 형성된 집수관(311)을 중심으로 내부 양측에 수평방향으로 된 복수의 격벽(312)이 동일한 간격으로 형성되며, 상기 격벽(312)에 의해 지지체(310) 내부에 복수의 유로가 형성되고, 상기 집수관(311)과 맞닿는 복수의 유로의 중심방향 측면마다 면적이 상이한 복수의 유출부(313a,313b)가 형성되고, 유출부에 의해 유로와 집수관이 연결되는 것으로 내부에 형성된 격벽(312)의 사이마다에 위치되는 복수의 유입공(314)이 형성되어 이루어진다.
Abstract:
Provided is a production process of graded-index typed plastic optical fiber preform improving flexibility which adjusts content of an initiator and a chained mobilizer to minimize reduction of glass transition temperature influenced by adding a plasticizer, therefore it improves transmission rate. The production process of the graded-index typed plastic optical fiber preform improving flexibility comprises the steps of: (i) mixing a first monomer showing relatively low refractive index with the initiator, the chained mobilizer and the plasticizer and rotating the mixture in a glass tube at 50-150deg.C to prepare a polymer tube; (ii) lowering the temperature, mixing the first monomer and a second monomer showing higher refractive index than the first monomer with the initiator, the chained mobilizer and the plasticizer, rotating and swelling the mixture to form gel in the polymer tube at normal temperature and rotating the polymer tube to polymerize the mixture with raising the temperature to 70-100deg.C; and (iii) increasing the content of the second monomer with repeating the second step for several times to produce the plastic optical fiber with a hollow hole filled.
Abstract:
PURPOSE: Polyarylene ether sulfides having an aliphatic group substituted with fluorine are provided to improve the molecular flexibility, thus to improve processability, to reduce birefringence and to make the adjustment of refractive index convenient, thereby being suitably used as a light waveguide element with less light loss and excellent mechanical and chemical properties. CONSTITUTION: The polyarylene ether sulfides have a structure represented by formula 1, wherein X is a single bond, -CO- or -SO2-; Y is a single bond, -S-, -CO- or -SO2-; m is an integer of 1-12; Ar is at least one functional group selected from functional groups represented by formula 2; each of a, b, c and d is a number representing the polymerization degree, a is an integer of 1-100, b is an integer of 1-100, c is an integer of 0-100 and d is an integer of 1-100, wherein a+b=b+d is satisfied.
Abstract:
PURPOSE: A method for manufacturing a mother material for use in a plastic photonic crystal fiber(P-PCF) is provided to be easily manufactured as well as to obtain various structure of the P-PCF by changing the thickness and the interval of the coating metal rod. CONSTITUTION: A method for manufacturing a mother material for use in a plastic photonic crystal fiber includes the steps of: preparing a mixed solution by adding an initiator and a chain transfer agent to a monomer for use a polymer having an excellent optical transmission characteristics; forming a syrup by using the mixed solution; inserting the syrup the glass tube as a bottom mold; assembling the top mold(10) having a plurality of metal rods(12) to the glass tube; and polymerizing the inserted syrup at a pressure of 4 -12kgf/cm2 and at a temperature of 70-180°C.
Abstract:
PURPOSE: A fluoro-substituted polyarylene ether sulfide compound is provided to reduce optical loss and double refraction index and to obtain an optical waveguide type optical device having excellent mechanical properties, heat resistance, chemical resistance and thermal stability. CONSTITUTION: The fluoro-substituted polyarylene ether sulfide compound is represented by the general formula I, wherein n is a polymerization degree and a natural number of 1-100, and the repeating units are the same or different, when n is 2 or more; and X is a substituent selected from the group consisting of the chemical formulae 1-4, and the compound comprises repeating units having a substituent selected from the group consisting of the chemical formulae 1-3, when the substituent is represented by the chemical formula 4.
Abstract:
PURPOSE: A light waveguide using fluorine-substituted polyimide is provided to increases a refractive index difference between a core and a clad by forming the core and the clad of the light waveguide using the fluorine-substituted polyimide whose refractive index is easily controlled. CONSTITUTION: According to the light waveguide comprising a core and a clad adjacent to the core which are formed with a polymer, the core and the polymide are fluorine-substituted polyimide respectively, and a refractive index of the polymer for forming the core is larger than that of the polymer for forming the clad. The refractive index difference between the polymer for forming the core and the polymer for forming the clad lies between 0.19% and 3.4% of the refractive index of the polymer for forming the core.
Abstract:
PURPOSE: A method for fabricating a plastic optical fiber is provided, which has a graded-refractive index with good refractive index distribution. CONSTITUTION: According to the method, a polymer tube is fabricated by mixing an initiator 0.01-0.4 wt% and a chain transfer catalyst 0.01-0.4 volume% to the first monomer having a relatively low refractive index and then inserting them into a glass tube and then rotating them with 50-150 and 500-5000 rpm. After mixing the first monomer and the second monomer having a relatively high refractive index with a volume ratio of 1/4 or 3/4 and then inserting them into the polymer tube, the polymer is swelled by rotating them in the atmosphere temperature with 500-5000 rpm. Then, the polymer is polymerized as rotating it with 500-5000 rpm in the temperature of 50-150 deg.
Abstract:
PURPOSE: Provided are a novel fluorine-containing monomer which can be used for polymerizing polyarylene ether having excellent thermal stability, as well as low optical loss and birefringence, and a method for producing the same. CONSTITUTION: The 1,1-bis(4-hydroxyphenyl)-1-pentafluorophenyl-ethane having a structure represented by formula 1, is produced by reacting pentafluoroacetophenone with phenol in methylene chloride by using trifluoromethane sulfonic acid as catalyst. Polyarylene ether formed by using 1,1-bis(4-hydroxyphenyl)-1-pentafluorophenyl-ethane, has high fluorine content and low hydrogen content, and thus shows low optical loss; and has a flexibility of ether bond and a branched phenyl group having hydrogen substituted with fluorine, and thus shows low birefringence.