Showing papers on "Styrene-butadiene published in 1969"
TL;DR: In this article, the preparation and examination of a series of styrene-butadiene block copolymers cast from toluene solution was described, and regular structures were observed under the electron microscope and it appears that particular solvents may give rise to characteristic structures.
99 citations
Patent•
26 Jun 1969
TL;DR: A LATEX COMPOSITION COMPRISING a stable AQUEOUS DISPERSION of a COPOLYMER PREPARED in an ACID AQUEous MEDIUM by EMULSION POLYMERIZATION of MONOMERIC MATERIAL CONTAINING from about 20% to about 55% by WEIGHT of METHACrylic ACID, from about 3% to approximately 35% by the weight of an ESTER of an ETHOXY-LATED ALCOHOL, E.G., AN ESTER
Abstract: A LATEX COMPOSITION COMPRISING A STABLE AQUEOUS DISPERSION OF A COPOLYMER PREPARED IN AN ACID AQUEOUS MEDIUM BY EMULSION POLYMERIZATION OF MONOMERIC MATERIAL CONTAINING FROM ABOUT 20% TO ABOUT 55% BY WEIGHT OF METHACRYLIC ACID, FROM ABOUT 3% TO ABOUT 35% BY WEIGHT OF AN ESTER OF AN ETHOXYLATED ALCOHOL, E.G., AN ESTER OF MALEIC ANHYDRIDE AND DINONYLPHEOXYPOLY(ETHYLENEOXY)ETHANOL, AND A BALANCE COMPRISING AT LEAST 35% BY WEIGHT OF STYRENE BUTADIENE OR MIXTURES THEREOF. THICKENING AGENTS HAVING EXCEPTIONAL THICKENING EFFCIENCY AND POLYMERIC EMULSIFIERS ARE PREPARED FROM THIS LATEX COMPOSITION BY ADJUSTING THE COMPOSITION TO AN ALKALINE PH.
76 citations
18 citations
TL;DR: In this article, the mechanical and rheo-optical properties of a styrene-butadiene-styrene block copolymer of a given chemical composition are dependent upon the morphology of the polymer as affected by the solvent system from which a polymer film is cast.
Abstract: : The mechanical and rheo-optical properties of a styrene-butadiene-styrene block copolymer of a given chemical composition are dependent upon the morphology of the polymer as affected by the solvent system from which a polymer film is cast. Films cast from methyl ethyl ketone and from toluene are compared. Properties found to differ are the stress-strain curve, the birefringence-strain curve, stress relaxation, birefringence relaxation and the dynamic mechanical spectra. (Author)
16 citations
TL;DR: In this paper, a study was made of the stress-strain and ultimate properties in simple tension of an elastomeric styrene-butadiene-styrene block copolymer (Kraton 101) and also of a similar material (Thermolastic 226) that contains about 35% plasticizer as well as inorganic pigments.
Abstract: A study was made of the stress–strain and ultimate properties in simple tension of an elastomeric styrene-butadiene-styrene block copolymer (Kraton 101) and also of a similar material (Thermolastic 226) that contains about 35% plasticizer as well as inorganic pigments. Stress–strain data were obtained at crosshead speeds from 0.02 to 20 in./min at temperatures from -40 to 60°C. The relaxation rate, derived from the data at constant extension rates, was about 8% per decade of time for both materials at temperatures from −40 to about 40°C and at extensions from about 20% up to 400%. Above −30°C, the shift factor log aT was found to vary linearly with temperature. These findings indicate that the time and temperature dependence of the mechanical properties results primarily from the plastic (or viscoelastic) characteristics of the styrene domains. The tensile strength for Kraton 101 below 40°C is somewhat greater than 4000 psi, sensibly independent of extension rate and temperature. For the highly plasticized Thermolastic 226, the tensile strength at an extension rate of 1.0 min−1 increases from 2200 psi at 0°C to 3600 psi at −40°C. Above 40°C for Kraton 101 and above 0°C for Thermolastic 226, the tensile strengths are quite dependent on extension rate and temperature owing to the increased ductility of the styrene domains. The high strength of these materials results from the uniformly dispersed styrene domains of colloidal dimensions. To obtain a crack of sufficient size to satisfy an energetic criterion for self-sustained high-speed propagation, domains must be disrupted. The plastic characteristics of the domains have a controlling effect on crack growth and thus on the ultimate properties of the materials. The strength and extensibility of other elastomers are considered in relation to those of the block copolymers.
4 citations
TL;DR: In this article, the transverse configuration of the pendant phenyl group is estimated irrespective of the styrene content of SBR, and the anisotropy of the copolymer varies linearly with the SBR content.
Abstract: Anisotropy of styrene–butadiene rubber (SBR) was investigated. The anisotropy of the copolymer varies linearly with the styrene content and the ultimate value coincides with that of polystyrene at elevated temperature. From these facts, the transverse configuration of the pendant phenyl group is estimated irrespective of the styrene content of SBR.
3 citations
Patent•
29 Dec 1969
2 citations
TL;DR: For example, this article reported that 84% of the users in St.Bd-St-Bd+St.St+Bd−St-St·Bd.
Abstract: シクロヘキサン中で第二級ブチルリチウムを触媒とし, リビソグアニナン重合法によりスチレン (St), ブタジエン (Bd) のブロック共重合体 (St-Bd-St型およびSt-Bd-St-Bd-St型) を合成した。得られた試料の固体状態における微細構造を電子顕微鏡およびX線小角散乱を用いて検討した。溶融粘度および衝撃強度はBdブロック鎖の長さのみでなくくり返しプロック数にも影響され, St含有量が84%以下ではSt-Bd-St-Bd。St型とSt-Bd-St型の間に衝撃強度の差異は認められないが, St含有量が88%になると, St-Bd-St-Bd-St型の方が約2倍の衝撃強度を示す。
2 citations
TL;DR: SBS2BS1 as discussed by the authors is a two-stage system that uses a 2D-LSTM-based LIDAR-based sensor network and is used to measure the distance between two objects.
Abstract: スチレンブロック(S)とブタジェンブロック(B)がSBSおよびSBSBSの順序に結合したブロック共重合体をリビング重合法により合成し,これら共重合体のモノマー組成,ブロックの長さおよび成膜に用いた溶媒の種類を変えた場合につ,動いて的粘弾性,応カ-伸び曲線および電子顕微鏡写真にみられる形態学的構造を検討した。低スチレン比率のSBS型ブロック共重合体ではブタジエン相が連続相でスチレン相が分散相となっているが,スチレン量の増加にともない,スチレン相も次第に連続相に近くなり,スチレン比率50(重量%)になると両相とも連続相になるが,延伸するとスチレン相は分散相に移行することが応力-伸び曲線よりみとめられた。S1BS2BS1型ブロック共重合体において,スチレン量を一定にして,S1とS2の大きさを相互に変えると,形態学的構造と物性にかなりの変化がみられた。成膜に用いた溶媒はTHF>トルエンシクロヘキサン>ヘプタンの順でスチレン相は連続相を形成しやすく,このような形態学的講造の変化は動的粘弾性や応力-伸び曲線に顕著に反映していることが確かめられた。SBS型およびSBSBS型ブロック共重合体の引張強さは末端のスチレンブロックの大きさとともに増大し,伸びはブタジェンブロックの大きさとともに増大した。
1 citations
Patent•
04 Sep 1969TL;DR: In this article, the authors improve the flow properties of a block copolymer by adding 5-50% of an ethylene-vinyl acetate (EVA) copolymers.
Abstract: Improving the flow properties of rubbery thermoplastic block copolymer (esp. styrene-butadiene-styrene block copolymers) by adding 5-50% of an ethylene-vinyl acetate (EVA) copolymer. Pigments and fillers such as purified chalk can be added to reduce surface glass and to give an attractive appearance, without detracting from the good flow properties. Esp. as injection moulding cpds. for large thin walled-mouldings such as table mats. record player turntables, etc.
1 citations