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含抗冲改性剂的丙烯酸树脂的抗冲强度、弯曲强度及断裂形态

Impact and flexural strength, and fracture morphology of acrylic resins with impact modifiers.

作者信息

Faot Fernanda, Panza Leonardo H V, Garcia Renata C M Rodrigues, Cury Altair Antoninha Del Bel

机构信息

Rua Gonçalves Chaves, 457, 2nd floor, Pelotas - RS - Brazil, Zip Code: 96015560 / Faculty of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.

出版信息

Open Dent J. 2009 Jun 29;3:137-43. doi: 10.2174/1874210600903010137.

DOI:10.2174/1874210600903010137
PMID:19657461
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2720515/
Abstract

OBJECTIVES

This study evaluated the impact and flexural strength and analyzed the fracture behavior of acrylic resins.

METHODS

Eighteen rectangular specimens were fabricated of Lucitone 550, QC 20 (both unreinforced acrylic resins), Impact 1500 (extra strength impact), Impact 2000 (high impact) according to the manufacturers' instructions. The impact strength was evaluated in notched specimens (50x6x4mm) and flexural strength in unotched (64x10x3.3mm), using three-point bending test, as well as, stress at yield, Young modulus and displacement at yield. Fragments from mechanical tests were observed by SEM. Data from impact strength, stress at yield and displacement at yield were analyzed by 1-way ANOVA and Tukey test (alpha=0.05). Young modulus values were analyzed by One-way ANOVA and Dunnett T3 multiple comparisons test (alpha=0.05).

RESULTS

Mean values of impact strength and stress at yield values were higher (P<.005) for Impact 2000 while Young modulus was higher (P<.05) for Lucitone 550; Impact 1500 and Impact 2000 showed significant values (P<.05) in the displacement at yield. Impact fractures of the all acrylic resins were brittle. Bending fractures of Lucitone 550 and Impact 2000 were brittle, QC 20 fractures were ductile and Impact 1500 showed brittle (75%) and ductile (25%) fractures.

CONCLUSION

Within the limitations of this study, the Impact 2000 showed improved mechanical properties with high capacity of stress absorption and energy dissipation before the fracture.

摘要

目的

本研究评估了丙烯酸树脂的抗冲击性和弯曲强度，并分析了其断裂行为。

方法

按照制造商的说明，用Lucitone 550、QC 20（均为未增强丙烯酸树脂）、Impact 1500（超强抗冲击）、Impact 2000（高抗冲击）制作了18个矩形试件。使用三点弯曲试验评估缺口试件（50×6×4mm）的抗冲击强度，以及无缺口试件（64×10×3.3mm）的弯曲强度，同时评估屈服应力、杨氏模量和屈服位移。通过扫描电子显微镜观察力学试验后的碎片。抗冲击强度、屈服应力和屈服位移的数据采用单因素方差分析和Tukey检验（α = 0.05）进行分析。杨氏模量值采用单因素方差分析和Dunnett T3多重比较检验（α = 0.05）进行分析。

结果

Impact 2000的抗冲击强度和屈服应力平均值较高（P <.005），而Lucitone 550的杨氏模量较高（P <.05）；Impact 1500和Impact 2000在屈服位移方面显示出显著值（P <.05）。所有丙烯酸树脂的冲击断裂均为脆性。Lucitone 550和Impact 2000的弯曲断裂为脆性，QC 20的断裂为韧性，Impact 1500显示出脆性（75%）和韧性（25%）断裂。

结论

在本研究的局限性内，Impact 2000显示出改善的力学性能，在断裂前具有高应力吸收和能量耗散能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/c53ef89b55fb/TODENTJ-3-137_F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/72094fbf2e31/TODENTJ-3-137_F1A.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/cab338ab5432/TODENTJ-3-137_F1B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/eb9793d706b6/TODENTJ-3-137_F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/d9100ce9b7d3/TODENTJ-3-137_F3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/0b431fcb4830/TODENTJ-3-137_F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/c53ef89b55fb/TODENTJ-3-137_F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/72094fbf2e31/TODENTJ-3-137_F1A.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/cab338ab5432/TODENTJ-3-137_F1B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/eb9793d706b6/TODENTJ-3-137_F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/d9100ce9b7d3/TODENTJ-3-137_F3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/0b431fcb4830/TODENTJ-3-137_F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/552f/2720515/c53ef89b55fb/TODENTJ-3-137_F5.jpg

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