感光性樹脂에 關한 硏究-Isophthalic acid-Cinnamic acid-Glycerine 系 縮重合物의 分子量에 關하여

심정섭,이부섭,Shim, Jyong-Sup,Lee, Boo-Sop 대한화학회 1962 대한화학회지 Vol.6 No.1

The polycondensates of isophthalic acid-cinnamic acid-glycerine system were synthesized. The molecular weights of these products were determined by two methods, viscosity method and osmotic pressure methods. In the synthesis of resin, the reaction temperature was kept at 232$^{\circ}C$ and the mole ratio of the reactants was chosen as follows: Glycerine ;1.0 Isophthalic acid ;1.0 Cinnamic acid ;2.8 Excessive cinnamic acid prevented gelation of reaction mixtures. As the solution became very dilute, reduced osmotic pressure P/C (at the concentration of solution below 0.24g/100 ml of acetone) and reduced viscosity ${\eta}_{sp}/C$ (at the concentration of solution below 0.32 g/100 ml of acetone) increased rapidly. The correspondence between molecular weights determined by the two methods made Huggin's equation applicable to the prepared polymer. The values of K and a are $2.77{\times}10^{-5}$ and 1.063, respectively.

Acrolein과 Vinyl Compounds의 共重合에 關한 硏究

심정섭,전영승,Jyong Sup Shim,Young-Sung Jun 대한화학회 1969 대한화학회지 Vol.13 No.4

In order to determine the monomer reactivity ratio in copolymerization of acrolein, the copolymerization of acrolein with styrene, methyl methacrylate and vinyl acetate respectively was studied. The Q and e value of acrolein in each copolymerization were also calculated from those of monomer reactivity ratios, but the calculated values were slightly different from each other. The Q and e of acrolein for the system of acrolein-styrene copolymerization were Q = O.64 and e = O.62 respectively. Relations among the Q and e value, the composition and structure of copolymers and the mean sequence length in copolymerization were also discussed for acrolein copolymers.

Graftpolymerization of Methacrylamide onto Silk

심정섭,김영덕,Jyong Sup Shim,Young Duk Kim Korean Chemical Society 1969 대한화학회지 Vol.13 No.4

Ceric salt 를 觸媒로 使用하여 여러 가지 反應條件 下에서 絹布上에 Methancrylamide를 grafting 시키고, Schweitzer 試藥에 依한 溶解性 및 赤外線吸收 스펙트럼을 比較檢討하여 그라프드重合物의 生成을 確認하였다. 그라프트率은 溫度, 反應時間 및 Monomer濃度가 增加함에 따라 增加하였으며 그라프트率은 極大化하는 最適의 pH 値가 있음을 알았다. 그라프트率에 관한 理論式을 誘導하고 그 結果를 檢討하였다.

Polyethylene Maleate와 Epoxy Resin Cinnamate의 合成과 그 感光 特性에 關한 硏究

심정섭,박홍수,홍성일,Jyong Sup Shim,Hong Soo Park,Sung Il Hong 대한화학회 1969 대한화학회지 Vol.13 No.4

Polyethylene maleate (PEM) and epoxy resin cinnamate (BEC) were prepared to investigate their photosensitivity. Various samples coated on glass plate were exposed to light under various conditions and steeped in the same solvent as used for coating, and then the yield of residual film (W/$W_0$) was calculated. The yield (W/$W_0$), which was closely related to the sensitivity of the film, was affected by the degree of polymerization of the film, light source, sensitizers land their concentration. In polymer homologs, the sensitivity depended upon degree of polymerization. Most effective sensitizers for PEM and BEC among those used here were benzanthrone and 2,6-dichloro-4-nitroaniline.

Graft 重合에 關한 硏究-紫外線 照射에 依한 Polyvinyl alcohol 과 Styrene 의 Graft 重合에 關하여

심정섭,전경철,Shim, Jyong-Sup,Jun, Kyong-Chul 대한화학회 1962 대한화학회지 Vol.6 No.1

The graft polymerization of styrene to polyvinyl alcohol using a photosensitizer(benzophenone) and ultraviolet light was studied. Styrene was grafted onto polyvinyl alcohol up to when polyvinyl alcohol was pre-immersed in water and irradiated by ultraviolet light for 24 hours styrene solution of benzophenone(0.01 molarity). The highest percentage of graft obtained in the grafting which was proceeded in the presence of water added immediately before irradiation was 29%. The grafting was proportional to irradiation time within a certain limit of time, i.e., 24 hours, and presumably was initiated at the surface. After a certain degree of grafting a definite maximum was reached. Graft polymer prepared in this experiment showed high resistance to various solvents.

Epoxy 樹脂에 關한 硏究 (第 1 報) Naphthylamines 及 Aromatic amines 과 Epichlorohydrin과의 重合物에 關하여

심정섭,홍성일,Shim, Jyong-Sup,Hong, Sung-Il 대한화학회 1961 대한화학회지 Vol.5 No.1

Nowadays, it is a well-known fact that the epoxy resins play an important role in the industrial field of plastics because of their excellent properties. Although studies on the polymers of epichlorohydrin with phenols, up-to-date, were various, there were only a few wokrs on the polymers of epichlorohydrin with amines. Therefore the experiments are carried out about the polymerization of epichlorohydrin with ${\alpha}-, {\beta}$-naphtylamine, o-, m-, p-toluidine, and o-, m-, p-nitroaniline. Examining the polymerization processes and the differences in the properties of the polymers, we obtained the following conclusions. 1) ${\alpha}$-naphthylamine, ${\beta}$-naphthylamine, o-toluidine, m-toluidine and p-toluidine react with epichlorohydrin to form polymers but o-, m-, and p-nitroaniline do not make polymers with epichlorohydrin. 2) As polymerization times after adding sodium hydroxide and refluxing again 3hrs. are suitable for ${\alpha}$-naphthylamine-epichlorohydrin, 3.5hrs. for${\beta}$-naphthylamine-epichlorohydrin, and 4hrs, for m-toluidine-epichlorohydrin. 3) Method for determining molecular weight of these polymers by the titration of end group is applicable to the polymers having D.P. less than about 200 for ${\alpha}$-, ${\beta}$-naphthylamine-epichlorohydrin and those having D.P. less than 18 for m-toluidine-epichlorohydrin. 4) Gererally, these polymers get special colors so that these need proper pigmentation to use as molding compounds.

PMD용 BKNO₃ 금속화약의 제조공정 및 특성분석

심정섭,김상백,안길환,김준형,류병태,Shim, Jungseob,Kim, Sangbaek,Ahn, Gilhwan,Kim, Junhyung,Ryu, Byungtae 한국추진공학회 2018 한국추진공학회지 Vol.22 No.3

고체 점화제 $BKNO_3$는 항공우주 및 유도탄 등의 점화제로 널리 적용되는데 본 연구에서는 $BKNO_3$의 제조공정과 특성평가를 수행하였다. 이 고체 점화제는 금속분말과 산화제 그리고 유기 고분자물질(결합재)로 구성된다. 증발법(evaporation process)을 사용하여 원료들을 균질하게 혼합하였다. CEA 프로그램을 사용하여 $BKNO_3$의 물질특성 및 열적 반응 해석을 통한 최적 조성비를 설계하였으며, 입도, 형상, 감도, 열량 분석 등의 특성 평가를 수행하여 결과를 분석하였다. This study investigated the manufacturing process and characteristics of $BKNO_3$ (Boron Potassium Nitrate) as a pyrotechnic propellant that is commonly used in the aerospace, defense, and automobile industries. The solid mixture was composed of oxidizing agent, fuel, and binder. Evaporation process was used to uniformly mix the raw materials. The optimal ratio of composition was designed through the CEA program analysis of the material characteristics and thermal responses. Further the size, shape, sensitivity, and calorimetry characteristics were studied.

Telomerization 에 關한 硏究 (I) Vinyl Acetate 와 Chlorinated Hydrocarbons 과의 Telomerization 에 關하여

심정섭,홍석주,Shim, Jyong-Sup,Hong, Suck-Joo 대한화학회 1962 대한화학회지 Vol.6 No.1

The telomerization of vinyl acetate with carbon tetrachloride, chloroform and monochlorobenzene were investigated with respect to the synthesis of those telomers, properties and molecular weights of the formed telomers, and reaction mechanisms. Vinyl acetate reacted with carbon tetrachloride and chloroform to form telomers at 70-90$^{\circ}C$ and 60-70$^{\circ}C$, respectively and it formed polymer with monochlorobenzene. As a chain transfer agent, carbon tetrachloride was more effective than chloroform. In the telomerization of vinyl acetate and carbon tetrachloride: 1) The average molecular weight of the telomer decreased as the mole ratio of carbon tetrachloride to vinyl acetate increased. The optimum conditions for the highest yield of the telomer were as follows: Mole ratio of carbon tetrachloride to vinyl acetate : 2.5 Reaction time : 20 hours. 2) As the reaction proceeded, the refractive index and average molecular weight of the telomer increased rapidly in the first 10 hours but the increase was slow through the next 10 hours, so that, the average recurring number(n) of taxogen in the final product reached an almost definite value, i.e., 3. The telomer formed in the telomerization of vinyl acetate with carbon tetrachloride and chloroform turned to brown color in the air due to decomposition or polymerization. The suggested telomerization mechanism was supported by the hexachloroethane detected in the course of reaction.

복합화약의 비선형 점탄성 특성 연구

심정섭,김현수,이근득,김정국,Shim Jung-Seob,Kim Hyoun-Soo,Lee Keun-Deuk,Kim Jeong-Kook 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.2

Nitramine-polymer composites suffer from a problem known as dewetting. Dewetting adversely affects the performance and the sensitivity characteristics of an explosive composition. Voids, which are generated between explosive particles and binder on dewetting, act as initiation sites. For a PBXs as well as propellants, where good adhesion and mechanical properties are of great importance, dewetting therefore must be prevented by strong adhesion between the filler and the binder. The surface energy of materials is measured by Wilhelmy plate and wicking method. The interfacial energy between the filler and the binder is calculated from the disperse phase and the polar phase of surface energy. Time dependent compressive properties of composite explosives have been determined by stress-strain curves obtained at different strain rates and temperatures. The interfacial state of the PBX was observed through SEM. It was found from the result that the interface between the explosive and the binder becomes better adhesion with decreasing interfacial tension and increasing work of adhesion. The result clearly shows that the castable PBX has good adhesion more than the pressable PBX.

복합화약 조성설계에서의 이론적 연구(I)

심정섭,김현수,Shim, Jung-Seob,Kim, Hyoun-Soo 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.2

A Plastic Bonded Explosive(PBX) is mainly composed of nitramine explosive and polymer binder. The great number of serious applications of PBX requires the good adhesion between nitramine crystals and binder, which depends on the surface characteristics of a filler and binder. In the pursuit of the better design to achieve the enhanced adhesion, profound knowledge of the surface and interfacial characteristics of explosive and binder should be exploited. In this study, the influences of physicochemical properties between RDX and binders such as interfacial tension($\gamma_{SL}$), latent heat($Q_m$), and density($\rho$) on impact sensitivity of PBX were investigated. As experimental results, the major contribution factor to impact sensitivity of PBX was the interfacial tension, compare with other surface properties. The correlation coefficient of $H_{50}$ versus $\gamma_{SL}$ is 0.9932 when a polynomial regression method was used.