The stess yielding mechanism of aged atactic polystyrene(α-PS) was studied by use of mechanical tension, differential scanning calorimetry ( DSC) and solvent-swelling.

Preparation of atactic polypropylene elastomers with a c_p~ ticl_2n [ si ( ch_3)_3]_2/ mao catalyst

Cp~TiCl2N[Si（CH3）3]2/MAO催化剂合成无规聚丙烯弹性体

The fractionation, viscosity and light-scattering measurements for three types of polystyrene, i.e., atactic, isotactic and 1:1 mixture of the two, were studied.

本文报导了有规立构聚苯乙烯，无规立构聚苯乙烯和1∶1混合有规和无规立构聚苯乙烯的分级、粘度和光散射测试结果。

The simulation results show that the discontinuous increase of number of layers appears in meso-scale sandwich structure with an existence of atactic transition, when the plate-to-plate distance increases.

模拟结果表明，随板间距的增大，体系分层数量的增加是不连续的，在分层数量的增加过程中，出现不规则结构的过渡区；

The catalytic efficiency was more than 34.8 kg/ g. The poly ( 1-butene)( PBt) included both isotactic structure and atactic structure.

实验表明，该催化体系对Bt聚合催化效率可达34.8kg／g，聚合物为全同立构和无规立构聚1－丁烯的混合物。

Synthesis of atactic polypropylene elastomers with half-titanocene catalyst in different solvents Study on the Structure and Property of Polyether-Urethane Elastomers

不同溶剂中合成弹性无规聚丙烯聚醚氨酯结构与微相分离的研究

Heredopathia atactic polyneuritifor lacking motor coordination; marked or caused by ataxia.

缺乏运动协调；有明显的运动失调特点或由运动性共济失调引起。

Study of the assignment on the~ ( 13) c-nmr spectra of atactic polypropylene stereoisomers

无规聚丙烯~（13）C-NMR立构序列归属的研究

Two-Dimensional ( 2D) FTIR Spectroscopic Study on Influence of Entanglements on Movements of Freeze-dried Atactic Polystyrene Molecules

二维红外相关光谱研究缠结对冷冻升华无规聚苯乙烯分子运动的影响

Finally the pentad sequences of atactic PEMA were calculated based on the discussion mentioned above.

最后计算了无规PEMA的五元组立构序列分布。

A Study of Stress-Yielding Mechanism of Aged Atactic Polystyrene

物理老化无规聚苯乙烯屈服机理的研究

Car B on-13 NMR study of chlorinated atactic polypropylene

~（13）C核磁共振研究氯化无规聚丙烯的结构

Progress in the synthesis of atactic polypropylene

无规聚丙烯的研究进展

Mechanism Analysis and Application of Atactic Polypropylene ( APP) Asphalt Waterproof Rolls for Highways and Bridges

路桥用APP防水卷材的防水机理分析与应用

Studies on atactic specific polymerization of propene with mononuclear Titanocene Catalysts

单茂钛催化剂的丙烯无规聚合反应及其动力学研究

Synthesis of High Molecular Weight Atactic Polypropylene& Polymerization in Alkane and Preliminary Characterization of the Products

合成高分子量无规聚丙烯&在烷烃溶剂中聚合及性能初步表征

The Physical Aging of Atactic Polystyrene Historical and Present Conditions of the Environmentally Friendly Polyurethane Tire Development

无规聚苯乙烯物理老化的研究历史和进展聚氨酯绿色轮胎的研究历史与现状

A Study of Synthesis of Atactic branched Polystyrene ( ABPS) in One Step

一步法合成无规支化聚苯乙烯（ABPS）的研究

Results showed that head-tail addition and atactic structure were dominant in polyether microstructure.

结果表明，聚醚的序列结构以头-尾相连为主且呈无规立构分布的特点。

Synthesis of the Graft Polymerization of Methacrylic Acid onto Atactic Polypropylene

无规聚丙烯接枝甲基丙烯酸的合成

Effect of Dynamic Injection Molding on Aggregation Structure and Mechanical Properties of Atactic Non-crystal PS

全程动态注射对无规非晶型PS制品聚集态结构与性能影响的研究