李惠林
高分子力化学、高分子共混和复合材料
个性化签名
- 姓名:李惠林
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- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
材料科学基础学科
- 研究兴趣:高分子力化学、高分子共混和复合材料
1965年毕业于华南工学院高分子工学专业,现任四川大学教授,博士生导师,中国化学会理事,高分子材料工程国家重点实验室学术委员会副主任。长期从事高分子力化学、高分子共混和复合材料的研究工作。作为负责人曾承担过国家“八五”、“九五”重点科技攻关项目、国家攀登计划中的子课题、国家自然科学基金重点和面上项目等10余项科学项目。曾获国家自然科学奖二等奖、国家发明四等奖、国家教委科技进步一等奖等7项奖励。发表论文80余篇,获授权中国发明专利3项
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【期刊论文】Influence of Ultrasound on the Processing and Structure of Polypropylene During Extrusion
李惠林, WRONG CAO and HUILIN LI*
POLYMER ENGINEERING AND SCIENCE, JULY 2002, Vol. 42, No.7,-0001,():
-1年11月30日
The effects of ultrasonic irradiation on extrusion processing and crystallization behavior of polypropylene (PP) are examined. The results show that appropriate irradiation intensity can prominently decrease die pressure and apparent viscosity, increase output, reduce extrudate swell, and improve apparent quality of PP. DSC and WAXD analysis demonstrate that the crystalline structure of PP is changed and the content of the pcrystalline increases through ultrasonic vibration. Special effects can be induced by ultrasound, such as strong stress, shatter and vibration, which alter the growth of PP crystals and may favor a special crystal transformation -j PI.
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【期刊论文】CMC系列高分子表面活性剂与原油超低界面张力形成机理的研究
李惠林, 曹亚
高等学校化学学报,2001,22(2):312~316,-0001,():
-1年11月30日
采用动态激光光散射及环境扫描电镜研究了羧甲基纤维素系列高分子表面活性剂与大庆原油形成超低界面张力的机理。 结果表明, CMC系列高分子表面活性剂具有与低分子量表面活性剂相比拟的表/界面活性, 其水溶液的表面张力可达2835mN/m, 界面张力达到10-110mN/m。 碱的加入可显著降低高分子表面活性剂与原油的界面张力, 在适当条件下界面张力达到超低值(10-3mN/m), 可望作为三次采油的驱油剂。等效烷烃模型研究表明, 用碱与原油酸性组分的作用来解释碱能使界面张力下降至超低值的传统观点是不完善的, 加入碱能使高分子表面活性剂胶束解缔, 胶束数量增多, 胶束粒径减小, 单分子自由链增加, 有利于高分子表面活性剂向界面迁移和排布, 这是高分子表面活性剂和碱复配体系与原油界面张力下降至超低值的主要原因。
高分子表面活性剂, 羧甲基纤维素, 超低界面张力
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【期刊论文】羧甲基纤维素系列高分子表面活性剂形成微乳液的研究
李惠林, 曹亚
高等学校化学学报,2000,21(1):160~164,-0001,():
-1年11月30日
采用紫外光谱、相图、动态激光光散射、同位素示踪、光学显微镜、电导率等研究了羧甲基纤维素系列高分子表面活性剂与甲苯-水-异丙醇体系微乳液的形成过程, 发现微乳液粒子大小均一, 形态一致, 其尺寸比低分子表面活性剂所形成的微乳液粒子大得多。 醇分子插入到油水界面, 改变了两相界面结构, 促使微乳液的生成。电导率测定表明所形成的微乳液区均为水包油结构, 即使在富含甲苯区域, 亦不会有油包水的反相胶束形成。
高分子表面活性剂, 羧甲基纤维素, 微乳液
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【期刊论文】1H-NMR Investigation of the Thermooxidation Degradation of Poly (oxymethylene) Copolymers
李惠林, Guangqin Pan, Huilin Li, Ya Cao
Journal of Applied Polymer Science, Vol. 93, 577-583 (2004),-0001,():
-1年11月30日
The thermooxidative degradation of poly-(oxymethylene) copolymer (CPOM-Y) powder was studied in air in 150
NMR, polyethers, thermal properties
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【期刊论文】Study on Processing of Ultrahigh Molecular Weight Polyethylene/Polypropylene Blends
李惠林, Gongde Liu, Yingzi Chen, Huilin Li
Journal of Applied Polymer Science, Vol. 94, 977-985 (2004),-0001,():
-1年11月30日
The processing of ultrahigh molecular weight polyethylene (UHMWPE) by the addition of polypropylene (PP) and high-density polyethylene (HDPE) was investigated. The results show that the addition of PP improves the processability of UHMWPE more effectively than does the addition of HDPE. UHMWPE/PP blends can be effectively processed with a twin-roller and general singlescrew extruder. In the extrusion of UHMWPE/PP blends, PP is enriched at the surface of the blend adjacent to the barrel wall, thus increasing the frictional force on the wall; the conveyance of the solid down to the channel can then be carried out. The melt pool against the active flight flank exerts a considerable pressure on the UHMWPE powder in the passive flight flank, which overcomes the hard compaction of UHMWPE. The PP penetrates into the gaps between the particles, acting as a heat-transfer agent and adhesive, thus enhancing the heat-transfer ability in the material.
polyethylene (, PE), , polypropylene (, PP), , processing, extrusion, heat transfer
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李惠林, Gongde Liu, Yingzi Chen, Huilin Li
Journal of Applied Polymer Science, Vol. 92, 3894-3900 (2004),-0001,():
-1年11月30日
The capillary flow properties and morphologies of ultrahigh molecular weight polyethylene/polypropylene (UHMWPE/PP) blends were studied. The results show that UHMWPE is difficult to process. The melts flowed unsteadily at lower shear rate. With 10wt% PP contained in the UHMWPE/PP blends, the apparent melt viscosity was much lower than that of UHMWPE. When the PP content increased to 20 and 30wt%, no pressure vibration occurred throughout the whole shear rate range. Microstructure analysis showed that PP prefers to locate in the amorphous or low crystallinity zones of the UHMWPE matrix. The flowability of UHMWPE increased substantially with the addition of PP. The addition of PE could not effectively reduce the chain entanglement density of UHMWPE. The improvement of processability of UHMWPE by the addition of PE was rather limited.
rheology, ultrahigh molecular weight polyethylene (, UHMWPE), , morphology, blends, crystal structures
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李惠林, Xiaolong Liu, Huilin Li
Journal of Applied Polymer Science, Vol. 93, 1546-1552 (2004),-0001,():
-1年11月30日
Flow performance of metallocene linear lowdensity polyethylene (mLLDPE) containing small amounts of polyethylene glycol (PEG) diatomite and diatomite/PEG binary processing aids respectively was investigated. The mLLDPE melt viscosity is increased by the addition of diatomite, but is decreased by addition of PEG or the diatomite/PEG binary processing aids. It was also found that the viscosity reduction of mLLDPE with the addition of diatomite/PEG binary processing aid was significantly greater than that obtained with the addition of only PEG. The flow curves of mLLDPE containing diatomite/PEG binary processing aid show extremely lower value and stronger dependence on shear rate than the others. It is suggested that the rheological improvement of mLLDPE with diatomite/PEG binary processing aids resulted not entirely from the wall slip promoted by PEG; the intrinsic structure may have changed under the application of shear flow.
rheology, polyethylene (, PE), , metallocene catalysts, additive, immiscibility
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李惠林, Gongde Liu, Yingzi Chen, Huilin Li*
Wear 256(2004)1088-1094,-0001,():
-1年11月30日
This paper explores anti-wear properties and wear mechanism for ultrahigh molecular weight polyethylene (UHMWPE) and ultrahigh molecular weight polyethylene/polypropylene (UHMWPE/PP) blends, which were prepared by melt extruding through a single-screw extruder, and were conducted sliding wear tests with MM-200 wear tester by sliding against 45# steel ring of a surface roughness about 0.015 m. Results show that anti-wear properties of UHMWPE are improved notably by blending with appropriated content of polypropylene (PP). The coefficients of friction and wear rate of UHMWPE/PP blend are much lower than those of pure UHMWPE during sliding. Partly oxidized transfer film of UHMWPE is formed on the surface of the steel counterpart. No transfer film but fine powders can be found on the steel ring surface sliding against the UHMWPE/PP blend. Long duration sliding causes fatigue failure of UHMWPE and many big spalls are produced around the counterpart edge, while the amount of debris from UHMWPE/PP blends does not show apparent increase with sliding time. DSC analysis reveals that the surface temperature of UHMWPE is higher than that of UHMWPE/PP blend during sliding. 'Shish-kebab' crystal is formed in the worn surface of UHMWPE/PP blend due to the long time shearing, stretching and annealing effect during sliding. The improvement of wear resistance is probably due to the rod shape debris existing between the contact surface of UHMWPE/PP and the counterpart, which helps to reduce the friction and wear efficiently.
Ultrahigh molecular weight polyethylene, Polypropylene, Wear and friction, Fatigue failure
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李惠林, Mingjia Zheng, Huilin Li
Journal of Applied Polymer Science, Vol. 91, 1635-1640 (2004),-0001,():
-1年11月30日
The morphological structure and mechanical properties of isotactic polypropylene (PP)/zinc-neutralized sulfonated ethylene propylene diene monomer rubber (Zn-SEPDM)/CaCO3 blends were studied. PP/Zn-SEPDM/CaCO3 blends were prepared through two different sequences. A: Blending PP with Zn-SEPDM, then adding CaCO3; B: Blending Zn-SEPDM with CaCO3, then adding PP. The blending sequence has substantial influence on the mechanical properties. SEM micrographs and X-ray photoelectron spectrometry indicate that the CaCO3 filler is encapsulated by Zn-SEPDM in those blends prepared through sequence B, which caused an extra increase of impact strength.
polypropylene, elastomers, fillers, blends, morphology
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李惠林, 曹亚
物理化学学报,1999,15(10):895~899,-0001,():
-1年11月30日
采用紫外光谱、XPS研究了羧甲基纤维素型高分子表面活性剂在硅胶/水界面上的吸附形态,结果表明随着高分子表面活性剂溶液浓度增大,分子在硅胶表面的吸附由单层逐渐变为多层,生成半胶束结构。
高分子表面活性剂,, 羧甲基纤维素,, 吸附形态,, 固/, 液界面
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